Overhanging Loads; Overhanging Load Example 2 - YASKAWA SGM series User Manual

SERVO SELECTION AND DATA SHEETS

5.3.5Overhanging Loads

5.3.5 Overhanging Loads
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1) A Servomotor may not be operated under an overhanging load, that is a load which tends
to continually rotate the motor.
Under an overhanging load (e.g. when the direction of the torque applied by the motor is
opposite from the direction of shaft rotation), the Servopack regenerative brake is applied
continuously and the regenerative energy of the load may exceed the allowable range
and damage the Servopack.
The regenerative brake capacity of the SGDA Servopack is rated for short-time opera-
tion, approximately equivalent to the deceleration stopping time.
• Overhanging Load Example 1: Motor drive for vertical axis, using no counterweight
• Overhanging Load Example 2: Tension control drive
Motor
Motor subject to be rotated from feed
motor to keep applied tension.
Tension