Dissipation; Maximum Torque Transmitted Through Shaft; Construction; Tachometer Generator (Optional) - DSI Dynamatic AS-703 Instruction Manual

Application Data
Data
Maximum Torque
Lb. Ft.

Dissipation

Maximum
Continuous
Horsepower
Inertia - Lb. Ft.
Size controller
Approximate Shipping

Maximum Torque Transmitted Through Shaft

(Standard Brakes Only)
AB-703 - 340 lbs. ft. AB-
704 - 563 lbs. ft. AB-705 -
860 lbs. ft. AB-706 - 1258
lbs. ft. AB-707 - 1749 lbs.
ft. AB-708 - 3103 lbs. ft.
Note - Numbers apply only when there is no
overhung load - consult factory for data with
overhung load.
Typical Brake Cutaway

Construction

A single field and rotor type brake as illustrated in
Figure 2-1 is representative of Models AS-703, AS-
705, and AS707. Models AS-704, AS-706
and AB-708 are of the double field and rotor
8
Slip RPM
AS-703
1800 53
1200 49
900 43
3600 10
1800 7.5
1200 5
900 3.5
0.82
1
108
Figure 2-1
Brake Model No.
AS-704 AS-705
110 210
99 204
90 195
20
15 20
10 15
7.5 11.5
1.64 8.0
2 2
205 265
type which include two rotors, fans and field
assemblies.

Tachometer Generator (optional)

General
The generator is a permanent-magnet, alternating-
current device that produces a linear voltage in
direct proportion to the speed at which it is driven.
In the governing circuit of the control system, the
voltage produced by the generator represents the
actual speed of the unit. This voltage is amplified
and compared with a constant voltage in the
reference circuit, representing the desired speed of
the unit, to effect speed control.
As shown in Figure 2-2, the maximum output speed
of the generator is approximately 55 to 60 volts.
Frequency varies with the speed to a maximum of
500 to 600 Hz. This generator is designed to
operate with equal output and efficiency in either
direction of rotation.
The use of an AC tachometer generator eliminates
rotating windings
maintenance of brushes, slip rings, or commutator
is required.
The Alnico magnet employed in this unit (Figure 2-
3) retains its field strength over a long period of
time, assuring a constant generator output at a
given speed. This magnet should not be subjected
to sharp impacts, abuse, or temperatures higher
than the maximum operating temperature of the
unit, as this will result in a weakening of the field
strength. Should removal of
Table 2-1
AS-706 AS-707
420
-
410 870
388 870
35 60
25 45
17.5 34
16.0 50
3 3
430 1010
and consequently
AS-708
-
1740
1740
100
75
56
100
7
1200
no