ASDA-B2 Chapter 2 Installation and Storage
Revision September 2013 2-11
(b) With Load
When there is an external load torque, servo motor is in reverse rotation when external
load greater than motor torque. Servo motor is usually in forward rotation and the motor
torque output direction is the same as the rotation direction. However, there is still
some special condition. If the motor output torque is in the reverse direction of rotation,
the servo motor is also in the reverse direction of rotation. The external power is input
into the servo drive through servo motor. The figure below is an example. The users
can see the motor is in forward rotation at constant speed when a sudden external load
torque change and great power is transmitted to regenerative resistor rapidly.
Motor Rotation Speed
External Load Torque
Motor Output Torque
Reverse
Rotation
Reverse
Rotation
Forward
Rotation
Forward
Rotation
External load torque in reverse direction: TL x Wr TL : External load torque
For the safety, we strongly recommend the users should select the proper resistance
value according to the load.
For example:
When external load torque is a +70% rated torque and rotation speed reaches
3000r/min, if using 400W servo drive (rated torque: 1.27Nt-m), then the users need to
connect a external regenerative resistor which power is 2 x (0.7 x 1.27) x (3000 x 2 x π/
60) = 560W, 40.
VARITEL INGENIERIA ELECTRONICA S.A.
info@varitel.com - www.varitel.com - Tel. (54) 11-4243-1171 / Fax: (54) 11-4292-7545
Manuel Baliña 456, Lomas de Zamora (B1832CCJ) Buenos Aires, Argentina.
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