Magtrol WB Series User Manual
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Magtrol WB Series User Manual

Eddy-current and magnetic powder dynamometers
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WB and PB Series
Eddy-Current and Magnetic
Powder Dynamometers
User's Manual
Via Paolo Uccello 4 - 20148 Milano
Tel +39 02 48 009 757 Fax +39 02 48 002 070
info@dspmindustria.it www.dspmindustria.it

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  • Page 1 WB and PB Series Eddy-Current and Magnetic Powder Dynamometers User’s Manual Via Paolo Uccello 4 - 20148 Milano Tel +39 02 48 009 757 Fax +39 02 48 002 070 info@dspmindustria.it www.dspmindustria.it...
  • Page 2 While every precaution has been exercised in the compilation of this document to ensure the accuracy of its contents, Magtrol assumes no responsibility for errors or omissions. Additionally, no liability is assumed for any damages that may result from the use of the information contained within this publication.
  • Page 3 IMPORTANCE TO RESPECT THE CURRENT SAFETY STANDARDS WHEN PLANNING, CONFIGURING AND OPERATING THE MOTOR TEST SYSTEM. 1. Make sure that all Magtrol dynamometers and electronic products are earth-grounded, to ensure personal safety and proper operation. 2. Check line voltage before operating electronic equipment.
  • Page 4 Revisions To This Manual The contents of this manual is subject to change without prior notice. REVISION DATE 1st edition – rev. F - September 2015 TABLE OF REVISIONS Date Edition Change Section(s) 09/02/15 1st Edition - rev F Page layout 3.1 / 3.1.2 04/21/15 1st Edition - rev E...

  • Page 5: Table Of Contents

    Table of Contents 1. INTRODUCTION ..........................1 1.1 GENERAL DESCRIPTION ............................1 1.2 DATA SHEETS ................................2 1.2.1 WB/PB 2.7 SERIES ............................2 1.2.2 WB/PB 43 SERIES ............................9 1.2.3 WB/PB 65 SERIES ............................17 1.2.4 WB/PB 115 SERIES ............................. 25 1.2.5 WB/PB 15 SERIES ............................
  • Page 6 Table of Contents Magtrol WB/PB Dynamometers 4. CONNECTIONS / CONFIGURATION ....................64 4.1 CONNECTION TO MAGTROL MOTOR TESTING ELECTRONICS ..............64 4.1.1 MANUAL TEST CONFIGURATION ......................64 4.1.2 PC-BASED TEST CONFIGURATION ......................65 4.2 TANDEM DYNAMOMETER CONFIGURATION ....................66 4.2.1 ELECTROMAGNETIC CLUTCH ....................... 66 4.2.2...
  • Page 7 Magtrol WB/PB Dynamometers Table of Contents TABLE OF FIGURES 2. INSTALLATION / MOUNTING Figure 2–1 WB/PB 2.7 Load Cell Locking System ........................... 42 Figure 2–2 WB/PB 43 Load Cell Locking System ............................ 43 Figure 2–3 WB/PB 65 Load Cell Locking System ............................ 44 Figure 2–4 WB/PB 115 Load Cell Locking System ..........................

  • Page 8: Installation / Mounting

    Preface PURPOSE OF THIS MANUAL This manual contains information required for the installation and general use of Magtrol’s WB Series and PB Series Dynamometers. To achieve maximum capability and ensure proper use, please read this manual in its entirety before operating. Keep the manual in a safe place for quick reference whenever a question should arise.
  • Page 9 Magtrol WB/PB Dynamometers Preface CONVENTIONS USED IN THIS MANUAL The following symbols and type styles may be used in this manual to highlight certain parts of the text: Note: This is intended to draw the operator’s attention to complementary information or advice relating to the subject being treated. It introduces information enabling the correct and optimal functioning of the product to be obtained.
  • Page 10 Preface Magtrol WB/PB Dynamometers This page was intentionally left blank viii...

  • Page 11: Introduction

    1. Introduction GENERAL DESCRIPTION The WB and PB Dynamometers manufactured by Magtrol are used for testing all types of motors and rotational systems, and measuring their torque and power according to their speed. They have been specially designed for integration in a complete motor testing system.

  • Page 12: Data Sheets

    Model 4 WB-2.7-8K Eddy-Current Dynamometer Description Motor testing sYsteMs Eddy-Current Brake Dynamometers (WB series) are ideal for Magtrol’s M-TEST 7 Software is a state-of-the-art motor applications requiring high speeds and also when operating in testing program for Windows®-based data acquisition. Used the middle to high power range.
  • Page 13 Dynamometer Controller M-TEST Magtrol also offers In-Line Torque Transducers for extremely accurate torque and speed measurement with high noise immunity. The transducers employ a unique non-contact differential transformer torque measuring technology which prevents the rotation of electronic components during operation, without the usage of sliprings. For a dynamic, high-precision system, the torque transducer can be mounted in line between the unit under test and the dynamometer.
  • Page 14 Chapter 1 – Introduction Magtrol WB/PB Dynamometers Specifications WB 2.7 eDDY-current DYnaMoMeter operating principles The WB Eddy-Current Dynamometers develop their full power for motors which rotate at high speeds, up to 50,000 rpm. The at high rotation speeds. The 2.7 Series is particularly intended braking torque depends on the rotation speed.
  • Page 15 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Specifications PB 2.7 poWDer DYnaMoMeter operating principles The PB Powder Dynamometers contain, as their name torque through friction between rotor and stator. The Powder suggests, a magnetic powder. The electrical current passing Dynamometers (PB) produce their rated torque at zero through the coil generates a magnetic field, which changes speed.
  • Page 16 Chapter 1 – Introduction Magtrol WB/PB Dynamometers Dimensions WB/PB 2.7 DYnaMoMeters With cooling circuit T (removable calibration arm) *Calibration in N·m 102 mm (for N·m)* with weight in kg ØD Tapping for calibration arm ØKK EXCITATION TORQUE SPEED ØK Cooling water connection Ø 6 mm (≈0.24 in) NOTE: Original dimensions are in Metric units.
  • Page 17 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Dimensions PB 2.7 DYnaMoMeters Without cooling circuit T (removable calibration arm) 102 mm (for N·m)* *Calibration in N·m with weight in kg ØD Tapping for calibration arm ØKK EXCITATION TORQUE SPEED ØK NOTE: Original dimensions are in Metric units.
  • Page 18 Chapter 1 – Introduction Magtrol WB/PB Dynamometers Ordering Information WB/PB 2.7 DYnaMoMeter options DYnaMoMeter MoDels Vertical Mounting (V) Powder with Powder without Eddy-Current Cooling Circuit Cooling Circuit Vertical Mounting is available on the Eddy-Current (WB) 2 WB 2.7-8K 1 PB 2.7-8K 1 PB 2.7-8...

  • Page 19: Wb/Pb 43 Series

    Integrated Optical Speed Sensor Eddy-Current Dynamometer Description Motor testing sYsteMs Eddy-Current Brake Dynamometers (WB series) are ideal for Magtrol’s M-TEST 7 Software is a state-of-the-art motor applications requiring high speeds and also when operating in testing program for Windows®-based data acquisition. Used the middle to high power range.
  • Page 20 Magtrol offers Eddy-Current and Powder Dynamometers mounted in tandem. In tandem, the unique features of each type of dynamometer brake are utilized, allowing the unit under test to be applied with nominal braking torque from zero speed to maximum rotation.
  • Page 21 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Specifications WB 43 eDDY-current DYnaMoMeter operating principles The WB Eddy-Current Dynamometers develop their full power for motors which rotate at high speeds, up to 50,000 rpm. The at high rotation speeds. The 43 Series is particularly intended braking torque depends on the rotation speed.
  • Page 22 ≈ 8 gal/kWh at ∆t = 86 °F (US) with a 30-bit pulse wheel delivered as standard. For better speed resolution in low speed applications, Magtrol offers a 600-bit or 6000-bit speed pickup (encoder) as an option. pB torque–speeD–poWer curves The diagram below shows the characteristic curves for the 43 Series Powder Dynamometers.

  • Page 23: Cooling

    0.1574 7.95 0.98 7.80 20.63 Ø 5.71 0.59 3.15 1.81 6.57 68.34 lb 4.919 0.1563 Shaft of high speed version (HS) is Ø 20-h6 mm, smooth (no key), with different length. Drawing on request or available at www.magtrol/support/salesdrawings.htm M AGTROL...
  • Page 24 Because the characteristics of the WB and PB dynamometers An electromagnetic clutch is needed for this application are complementary, Magtrol is able to offer them mounted which automatically switches off at the maximum speed of in a tandem setup. Each dynamometer (WB and PB) can the PB Powder Dynamometer and automatically switches on autonomously operate according to its own characteristics.
  • Page 25 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Tandem Specifications WB/PB 43 tanDeM DiMensions (removable calibration arm) DRIVE SIDE Electromagnetic tooth clutch (EK) * Use outer groove to 255 mm (for N·m)* achieve calibration 250 mm (for mkp) in N·m when using...
  • Page 26 DYnaMoMeter options High Speed (HS) Mechanical Rotor Blocking Device (MB) For testing small/miniature high-speed motors, Magtrol offers A mechanical rotor blocking device, which allows locked rotor a WB 43 Eddy-Current Dynamometer with speed ranges up testing, is available for the WB Dynamometer.

  • Page 27: Wb/Pb 65 Series

    Description transmission systems, motors for domestic appliances, starter motors, gas turbines and turbocompressors. Eddy-Current Brake Dynamometers (WB series) are ideal for applications requiring high speeds and also when operating in Motor testing sYsteMs the middle to high power range. Eddy-Current Brakes provide increasing torque as the speed increases, reaching peak torque Magtrol’s M-TEST 7 Software is a state-of-the-art motor testing...
  • Page 28 Magtrol offers Eddy-Current and Powder Dynamometers mounted in tandem. In tandem, the unique features of each type of dynamometer brake are utilized, allowing the unit under test to be applied with nominal braking torque from zero speed to maximum rotation.
  • Page 29 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Specifications WB 65 eDDY-current DYnaMoMeter operating principles The WB Eddy-Current Dynamometers develop their full power for motors which rotate at high speeds, up to 30,000 rpm. The at high rotation speeds. The 65 Series is particularly intended braking torque depends on the rotation speed.
  • Page 30 ≈ 8 gal/kWh at ∆t = 86 °F (US) with a 60-bit pulse wheel delivered as standard. For better speed resolution in low speed applications, Magtrol offers a 600-bit or 6000-bit speed pickup (encoder) as an option. pB torque–speeD–poWer curves The diagram below shows the characteristic curves for the 65 Series Powder Dynamometers.
  • Page 31 0.2362 11.10 0.98 9.45 40.71 Ø 7.09 0.91 4.13 1.97 5.04 154.32 lb 5.902 0.2351 Shaft of high speed version (HS) is Ø 25-h6 mm, smooth (no key), with different length. Drawing on request or available at www.magtrol/support/salesdrawings.htm M AGTROL...
  • Page 32 Because the characteristics of the WB and PB Dynamometers An electromagnetic clutch is needed for this application are complementary, Magtrol is able to offer them mounted which automatically switches off at the maximum speed of in a tandem setup. Each dynamometer (WB and PB) can the PB Powder Dynamometer and automatically switches on autonomously operate according to its own characteristics.
  • Page 33 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Tandem Specifications WB/PB 65 tanDeM DiMensions DRIVE SIDE Electromagnetic tooth clutch (EK) (removable calibration arm) * Use outer groove to 510 mm (for N·m)* achieve calibration 500 mm (for mkp) in N·m when using...
  • Page 34 DYnaMoMeter options High Speed (HS) Mechanical Rotor Blocking Device (MB) For testing small/miniature high-speed motors, Magtrol offers A mechanical rotor blocking device, which allows locked rotor a WB 65 Eddy-Current Dynamometer with speed ranges up testing, is available for the WB Dynamometer.

  • Page 35: Wb/Pb 115 Series

    Integrated Optical Speed Sensor Powder Dynamometer Description Motor testing systeMs Eddy-current Brake Dynamometers (WB series) are ideal for Magtrol’s M-TEST 7 Software is a state-of-the-art motor applications requiring high speeds and also when operating in testing program for Windows®-based data acquisition. Used the middle to high power range.
  • Page 36 Magtrol offers Eddy-Current and Powder Dynamometers mounted in tandem. In tandem, the unique features of each type of dynamometer brake are utilized, allowing the unit under test to be applied with nominal braking torque from zero speed to maximum rotation.
  • Page 37 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Specifications WB 115 eDDy-current DynaMoMeter operating principles The WB Eddy-Current Dynamometers develop their full power for motors which rotate at high speeds, up to 22,000 rpm. The at high rotation speeds. The 115 Series is particularly intended braking torque depends on the rotation speed.
  • Page 38 ≈ 8 gal/kWh at ∆t = 86 °F (US) with a 60-bit pulse wheel delivered as standard. For better speed resolution in low speed applications, Magtrol offers a 600-bit or 6000-bit speed pickup (encoder) as an option. pB torque–speeD–poWer curves The diagram below shows the characteristic curves for the 115 Series Powder Dynamometers.
  • Page 39 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Specifications WB/PB 115 single DynaMoMeter DiMensions (removable calibration arm) * Use outer groove to 510 mm (for N·m)* achieve calibration 500 mm (for mkp) in N·m when using ØU Tapping for calibration arm...
  • Page 40 Because the characteristics of the WB and PB dynamometers An electromagnetic clutch is needed for this application are complementary, Magtrol is able to offer them mounted which automatically switches off at the maximum speed of in a tandem setup. Each dynamometer (WB and PB) can the PB Powder Dynamometer and automatically switches on autonomously operate according to its own characteristics.
  • Page 41 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Tandem Specifications WB/PB 115 tanDeM DiMensions * Use outer DRIVE SIDE (removable calibration arm) groove to Electromagnetic tooth clutch (EK) achieve 510 mm (for N·m)* calibration 500 mm (for mkp) in N·m when...
  • Page 42 Chapter 1 – Introduction Magtrol WB/PB Dynamometers Ordering Information WB/PB 115 DynaMoMeter options DynaMoMeter MoDels Industrial Version (IS) Brake 1 Powder Tandem 1 WB 115 1 PB 115 2 WB 115 + EK + 1 PB 115 Single WB and PB Dynamometers are also available in an...

  • Page 43: Wb/Pb 15 Series

    Integrated Optical Speed Sensor Eddy-Current Dynamometer Description Motor testing systeMs Eddy-Current Brake Dynamometers (WB series) are ideal for Magtrol’s M-TEST 7 Software is a state-of-the-art motor applications requiring high speeds and also when operating in testing program for Windows®-based data acquisition. Used the middle to high power range.
  • Page 44 Magtrol offers Eddy-Current and Powder Dynamometers mounted in tandem. In tandem, the unique features of each type of dynamometer brake are utilized, allowing the unit under test to be applied with nominal braking torque from zero speed to maximum rotation.
  • Page 45 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Specifications WB 15 eDDy-current DynaMoMeter operating principles The WB Eddy-Current Dynamometers develop their full power for motors which rotate at high speeds, up to 7500 rpm. The at high rotation speeds. The 15 Series is particularly intended braking torque depends on the rotation speed.
  • Page 46 ≈ 8 gal/kWh at ∆t = 86 °F (US) with a 60-bit pulse wheel delivered as standard. For better speed resolution in low speed applications, Magtrol offers a 600-bit or 6000-bit speed pickup (encoder) as an option. pB torque–speeD–poWer curves The diagram below shows the characteristic curves for the 15 Series Powder Dynamometers.
  • Page 47 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Specifications WB/PB 15 single DynaMoMeter DiMensions (removable calibration arm) * Use outer groove 510 mm (for N·m)* to achieve calibration in N·m 500 mm (for kpm) when using ØU weight in kg Tapping for...
  • Page 48 Because the characteristics of the WB and PB dynamometers An electromagnetic clutch is needed for this application are complementary, Magtrol is able to offer them mounted which automatically switches off at the maximum speed of in a tandem setup. Each dynamometer (WB and PB) can the PB Powder Dynamometer and automatically switches on autonomously operate according to its own characteristics.
  • Page 49 Magtrol WB/PB Dynamometers Chapter 1 – Introduction Tandem Specifications WB/PB 15 tanDeM DiMensions DRIVE SIDE Electromagnetic tooth clutch (EK) (removable calibration arm) * Use outer groove to achieve 510 mm (for N·m)* calibration in N·m when using WB 15 PB 15...
  • Page 50 Chapter 1 – Introduction Magtrol WB/PB Dynamometers Ordering Information WB/PB 15 DynaMoMeter options DynaMoMeter MoDels Industrial Version (IS) Eddy-Current Powder Tandem 1 WB 15 1 PB 15 2 WB 15 + EK + 1 PB 15 Single WB and PB Dynamometers are also available in an...

  • Page 51: Installation / Mounting

    The load measuring cell is a precision instrument which must be protected from shocks during transport in order to guaranty the measurement repeatability. Therefore, all Magtrol WB/PB Dynamometers are fitted with a locking system in order to protect the load cell during transport.

  • Page 52: Wb/Pb 2.7 Series

    Chapter 2 – Installation / Mounting Magtrol WB/PB Dynamometers 2.1.1 WB/PB 2.7 S erieS Before mounting any WB/PB 2.7 Series Dynamometer to the test bench, the load cell must first be unlocked. The shipping/restraining pin of the locking system is found on the lower part of the brake.

  • Page 53: Wb/Pb 43 Series

    Magtrol WB/PB Dynamometers Chapter 2 – Installation / Mounting 2.1.2 WB/PB 43 S erieS WB/PB 43 Series Dynamometers are fitted with a connecting screw between the stator assembly and the load cell. After installing the dynamometer on a test bench, fasten the connecting screw to get the load cell operational.

  • Page 54: Wb/Pb 65 Series

    Chapter 2 – Installation / Mounting Magtrol WB/PB Dynamometers 2.1.3 WB/PB 65 S erieS WB/PB 65 Series Dynamometers are fitted with a mechanical stator assembly locking device protecting the load cell during transport. After installing the dynamometer on the test bench, proceed as follows and refer to figure 2–3 to unlock the system:...

  • Page 55: Wb/Pb 115 Series

    Magtrol WB/PB Dynamometers Chapter 2 – Installation / Mounting 2.1.4 WB/PB 115 S erieS WB/PB 115 Series Dynamometers are fitted with a mechanical stator assembly locking device protecting the load cell during transport. After installing the dynamometer on the test bench, proceed as follows and refer to figure 2–4 to unlock the system:...

  • Page 56: Wb/Pb 15 Series

    Chapter 2 – Installation / Mounting Magtrol WB/PB Dynamometers 2.1.5 WB/PB 15 S erieS WB/PB 15 Series Dynamometers are fitted with a mechanical stator assembly locking device protecting the load cell during transport. After installing the dynamometer on the test bench, proceed as follows and refer to figure 2–5 to unlock the system:...

  • Page 57: Mounting The Dynamometer To The Test Bench

    Note: Magtrol offers standard and custom dynamometer tables specially designed to support the entire range of Magtrol dynamometers. The dynamometer is mounted onto the bench by means of four screws. The size of these screws depends on the dynamometer model. Tandem dynamometers require stronger screws than single dynamometers.

  • Page 58: Couplings

    Couplings with insufficient torsion stiffness will generate unwanted sinusoidal signals on the original measuring signal. The coupling must be dynamically balanced (Q1 for WB Series Dynamometers and Q2.5 for PB Series Dynamometers). This balancing must compensate for maximum tolerated misalignment between the motor under test and the dynamometer.

  • Page 59: Measuring Range

    10% and 100% of their rating. DRAG TORQUE Magtrol dynamometers are characterized by a low drag torque: approximately 1% of the rated torque for WB Series Dynamometers and approximately 2% for PB Series Dynamometers. Refer to the corresponding data sheets (see Section 1.2) for the maximum drag torque values of each model.

  • Page 60: Connecting The Cooling System

    CONNECTING THE COOLING SYSTEM Proper cooling of the dynamometer is essential to ensure a long operating life and accurate measuring results. All Magtrol WB/PB Series Dynamometers* are water-cooled to guaranty the best possible heat dissipation. * PB 2.7 Series Dynamometers are available with (K) or without a cooling circuit.

  • Page 61: Figure 2-7 Example Of Protective System

    Magtrol WB/PB Dynamometers Chapter 2 – Installation / Mounting Figure 2–7 shows a good example of a protective system. All parts of the bench are accessible, but the covers prevent any risk to the user when closed. Figure 2–7 Example of Protective System...

  • Page 62: Power/Heat Dissipation

    Magtrol WB/PB Dynamometers POWER/HEAT DISSIPATION All Magtrol WB/PB Series Dynamometers are instruments which absorb energy. They convert the kinetic energy of the coupled rotating systems into heat. The quantity of heat which can be dissipated by the dynamometers is not infinite. Additionally, the dynamometers cannot resist excessive temperatures without damage.

  • Page 63: Figure 2-9 Pb 2.7 Ratings Curve

    Magtrol WB/PB Dynamometers Chapter 2 – Installation / Mounting 320 rpm 3000 rpm 4 PB 2.7-8 (TORQUE) 2 PB 2.7-8 (TORQUE) 1000 1000 1 PB 2.7-8 (TORQUE) 1000 10,000 100,000 Rotation Speed (rpm) Figure 2–9 PB 2.7 Ratings Curve 9550 rpm 50.000 rpm...

  • Page 64: Figure 2-11 Pb 43 Ratings Curve

    Chapter 2 – Installation / Mounting Magtrol WB/PB Dynamometers 955 rpm 4000 rpm 2 PB 43 (TORQUE) 1 PB 43 (TORQUE) 0.01 1000 10,000 Rotation Speed (rpm) Figure 2–11 PB 43 Ratings Curve 5730 rpm 30,000 rpm 1000 10,000 100,000 Rotation Speed (rpm) Figure 2–12 WB 65 Ratings Curve...

  • Page 65: Figure 2-13 Pb 65 Ratings Curve

    Magtrol WB/PB Dynamometers Chapter 2 – Installation / Mounting 570 rpm 3000 rpm 2 PB 65 (TORQUE) 1 PB 65 (TORQUE) 0.01 1000 10,000 Rotation Speed (rpm) Figure 2–13 PB 65 Ratings Curve 2865 rpm 18,000 rpm 1000 10,000 100,000 Rotation Speed (rpm) Figure 2–14 WB 115 Ratings Curve...

  • Page 66: Figure 2-15 Pb 115 Ratings Curve

    Chapter 2 – Installation / Mounting Magtrol WB/PB Dynamometers 480 rpm 3000 rpm 1000 2 PB 115 (TORQUE) 1 PB 115 (TORQUE) 0.01 1000 10,000 Rotation Speed (rpm) Figure 2–15 PB 115 Ratings Curve 2390 rpm 7500 rpm 1000 1000...

  • Page 67: Figure 2-17 Pb 15 Ratings Curve

    Magtrol WB/PB Dynamometers Chapter 2 – Installation / Mounting 382 rpm 2000 rpm 10,000 4 PB 15 (TORQUE) 1000 2 PB 15 (TORQUE) 1 PB 15 (TORQUE) 1000 10,000 Rotation Speed (rpm) Figure 2–17 PB 15 Ratings Curve...

  • Page 68: Cooling

    3. Cooling DYNAMOMETER COOLING Proper cooling of the dynamometer is essential to ensure a long operating life and accurate measuring results. All Magtrol WB/PB Series Dynamometers* are water-cooled to guaranty the best possible heat dissipation. Note: PB 2.7 Series Dynamometers are available with a cooling circuit (K) or without a cooling circuit.

  • Page 69: Open-Circuit Cooling Systems

    Magtrol WB/PB Dynamometers Chapter 3 – Cooling 3.1.4 emPerAture enSor The dynamometer is fitted with a sensor measuring the outlet water temperature. This sensor generates an alarm in case of overheating. OPEN-CIRCUIT COOLING SYSTEMS In an open-circuit cooling system, the necessary water comes directly from the main water distribution system (faucet), passes through the dynamometer, and is then disposed of (down a drain).

  • Page 70: Closed-Circuit Cooling Systems

    Chapter 3 – Cooling Magtrol WB/PB Dynamometers CLOSED-CIRCUIT COOLING SYSTEMS The closed-circuit cooling system uses water-to-air or water-to-water heat exchangers, or a chiller. This system is used when the water supply is restricted or when the water cannot be used for cooling without prior treatment/filtering.

  • Page 71: Cooling Water Issues

    Magtrol WB/PB Dynamometers Chapter 3 – Cooling COOLING WATER ISSUES Despite the fact that water is necessary for cooling, it represents a risk. Rust, corrosion, erosion and scale deposits have a negative effect on the functioning of the dynamometer. 3.4.1 mPuritieS As a matter of fact, running water may contain dust;...

  • Page 72: Filtering

    Chapter 3 – Cooling Magtrol WB/PB Dynamometers °dH = German hardness degree = 10 mg CaO/liter °THfr = French hardness degree = 10 mg CaCO /liter °eH = English hardness degree = 1 grain CaCO /gallon °THus = American hardness degree...

  • Page 73: Condensation

    This happens very quickly and forces the user to send the dynamometer back to Magtrol for replacement of the magnetic powder. On WB Series Eddy-current Dynamometers, the condensation generates rust on the internal components which rapidly reduces the operating life of the dynamometer.

  • Page 74: Connections / Configuration

    These manuals can be found on Magtrol's User Manual CD-ROM (delivered with your dynamometer) and can also be accessed at Magtrol's Web site: www.magtrol.com. Refer to these documents for additional information on connecting the WB/PB Series Dynamometer to Magtrol motor testing electronics.

  • Page 75: Pc-Based Test Configuration

    BASed onFigurAtion For enhanced motor testing capabilities and full data acquisition, Magtrol offers a complete system which includes a DSP High-Speed Programmable Dynamometer Controller and M-TEST Motor Testing Software. Communication between the DSP Controller and PC running the M-TEST Software is carried out by a GPIB or RS-232 interface board and corresponding connection cable.

  • Page 76: Tandem Dynamometer Configuration

    When the speed of the PB Dynamometer is at zero, the electromagnetic clutch is engaged. Conversely, the clutch disengages when the PB Dynamometer has reached its maximum speed. This function is automatic when a Magtrol DSP Controller is used. (See Note in Section 4.2.)

  • Page 77: Transformer Connection

    Magtrol WB/PB Dynamometers Chapter 4 – Connections / Configuration 4.2.2 rAnSFormer onnection A transformer converts the power supplied by the DES into a 24 V DC current, in order to energize the electromagnetic clutch. The connecting cable between the DES Power Supply and the transformer is already connected to the transformer terminals 1 (brown lead) and 2 (blue lead).

  • Page 78: Connection To Non-Magtrol Electronic Control Units

    The PB Series Dynamometer torque depends exclusively on the excitation current, whereas the torque of a WB Series Dynamometer is determined by both the excitation current and its speed. Therefore, with WB Dynamometers, the excitation current must be reduced when its speed is being increased to hold a constant torque.

  • Page 79: Figure 4-7 Connector Pin Configuration For Wb/Pb 2.7 Dynamometer Power

    Magtrol WB/PB Dynamometers Chapter 4 – Connections / Configuration Supply + Supply – Figure 4–7 Connector Pin Configuration for WB/PB 2.7 Dynamometer Power Temperature A Temperature B Supply + Supply – Figure 4–8 Connector Pin Configuration for WB/PB 43 Dynamometer Power and Temperature...

  • Page 80: Torque Signal Connection

    Chapter 4 – Connections / Configuration Magtrol WB/PB Dynamometers 4.3.2 orque ignAl onnection The torque signal is supplied by a load cell fitted with a bridge strain gauge. 1 2 3 Signal + Signal – Supply + Supply – Figure 4–10 Connector Pin Configuration for WB/PB 2.7 and 43 Dynamometer Torque Signals Note: The use of shielded cable is mandatory.

  • Page 81: Speed Signal Connection

    Note: The use of a 600-bit encoder limits the speed of the system to 10,000 rpm. If the testing application requires, Magtrol can offer a speed sensor providing 6,000 impulses per revolution. This provides a higher resolution but limits the speed to 1000 rpm.

  • Page 82: Operating Principles

    5. Operating Principles EDDY-CURRENT DYNAMOMETERS (WB) Magtrol Eddy-current Dynamometers carry the designation of "WB" which stands for "Wirbelstrom- Bremse" in German (Wirbelstrom = Eddy-current, bremse = brake). Eddy-currents are circular currents induced in conductors crossing a magnetic field. These currents generate electromagnetic forces acting against the movement of the rotor.

  • Page 83: Calibration

    6. Calibration Every new Magtrol WB/PB Series Dynamometer is factory calibrated. Static calibration of the zero and torque is recommended from time to time, especially after having maintenance performed. Note: Do not forget to unlock the dynamometer following transport (after it returns from overhaul) in accordance with Section 2.1 –...

  • Page 84: Calibration Weight

    2 PB 115 1 WB 15 2 WB 15 3 WB 15 4 WB 15 1 PB 15 2 PB 15 4 PB 15 1200 Note: A calibration weight adapted specifically for the dynamometer can be ordered directly from Magtrol.

  • Page 85: Calibration With Magtrol Motor Testing Electronics

    Magtrol's web site: www.magtrol.com. CALIBRATION USING NON-MAGTROL ELECTRONIC CONTROL UNITS When a Magtrol TSC Torque/Speed Conditioner and DSP Controller are not used in the test bench, the calibration must be carried out by using the following procedure: 1. Mount the calibration arms.

  • Page 86: Wb/Pb 43 Series

    Chapter 6 – Calibration Magtrol WB/PB Dynamometers wb/pb 43, 65 115 s aution or overload Calibration of eries 150% ynamometers readings of of the nominal torque are only possible if the measuring system operates without saturation dsp- (wb/pb ith a Complete...

  • Page 87: Wb/Pb 65 Series

    Magtrol WB/PB Dynamometers Chapter 6 – Calibration 6.4.2 WB/PB 65 S erieS     Figure 6–3 WB/PB 65 Overload Protection Calibration 1. Mount the calibration arms. (See Section 6.1.1 – Calibration Arms.) 2. Place 100% of the calibration weight on the arm on the connector side.

  • Page 88: Wb/Pb 115 Series

    Chapter 6 – Calibration Magtrol WB/PB Dynamometers 6.4.3 WB/PB 115 S erieS     Figure 6–4 WB/PB 115 Overload Protection Calibration 1. Mount the calibration arms. (See Section 6.1.1 – Calibration Arms.) 2. Place 100% of the calibration weight on the arm on the connector side.

  • Page 89: Maintenance And Repair

    In case of a defect, please refer to both the Warranty and Service Information located at the back of this manual. Whether you are directed to ship your equipment back to Magtrol, Inc. in the United States or Magtrol SA in Switzerland, it is very important to include the following information with your return shipment: •...
  • Page 90 Testing, Measurement and Control of Torque-Speed-Power • Load-Force-Weight • Tension • Displacement Via Paolo Uccello 4 - 20148 Milano Tel +39 02 48 009 757 Fax +39 02 48 002 070 info@dspmindustria.it www.dspmindustria.it...

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