Three-Phase Motors; Motor Selection - Eaton PowerXL DC1 20 Series Installation Manual

2.11 Three-phase motors

2.11.1 Motor Selection

DC1-...E1 variable frequency drives can be used to drive the following
three-phase AC motors with sensorless control:
• Three-phase asynchronous motor (DAM),
• Permanent magnet motor (PM),
• Brushless DC motors (BLDC),
• Synchronous reluctance motor (SynRM).
When used with their default settings, DC1-...E1 variable frequency drives
are configured for V/Hz modulation for the rated motor output of a three-
phase asynchronous motor, i.e., this is the intended application for "out-of-
the-box operation" without configuring any parameters.
￫
Vector mode, as well as running PM, BLDC, or SyncRM motors,
will need for parameters P-60 and P-61 on DC1 variable
frequency drives to be configured accordingly.
￫
Check whether the DC1 variable frequency drive you selected
and the AC motor you will be using are compatible with each
other as per the corresponding voltage (mains and motor
voltage) and rated operational current.
Configurations such as the ones used in outrunner motors and slip-ring
motors also fall under the three-phase asynchronous motor category (which
in turn is also referred to as the "squirrel-cage rotor" or "standard motor"
category). These motors can also be run with DC1 variable frequency drives,
but will normally require additional engineering, modifying the various
parameters, and detailed information from the motor manufacturer.
General recommendations for motor selection:
• Only use motors that have insulation class F (maximum steady state
temperature of 155 °C ) at least.
• Choose 4 pole motors preferably (synchronous speed: 1500 min
50 Hz and 1800 min
• Take the operating conditions into account for S1 operation (IEC 60034-1).
• Do not oversize the motor, i.e., the motor should not be more than one
rating level higher than the rated motor output.
• In the case of undersized motors, the motor output for continuous
operation should not be more than one rating level lower than the rated
rating level (in order to ensure that the motor will be protected).
• When running tests or commissioning a system with significantly lower
motor outputs, the motor's rated operational current must be adjusted
using parameter P-08 ("rated motor current").
DC1...20... and DC1...OE1 Variable Frequency Drives 02/20 MN040059EN www.eaton.com
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at 60 Hz).
2 Engineering
2.11 Three-phase motors
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