Wiring
‑138‑
When the motor direction of rotation is the same with the shaft direction of
rotation, the motor outputs energy to the outside. In some applications where the
motor direction of rotation is opposite to the shaft direction of rotation, the motor
is in the generating state and feeds the electric energy back to the servo drive.
When the load is in the generating state continuously, it is recommended to adopt
the common DC bus mode.
Figure 3‑49 Example of the curve with external load torque
Take H1 series 750 W motors (rated torque: 2.39 N·m) as an example. When the
external load torque is 60% of the rated torque and the motor speed reaches
1500 RPM, the power fed back to the servo drive is (60% x 2.39) x (1500 x 2 π/60) =
225 W. As the regenerative resistor needs to be derated by 70%, the power of the
external regenerative resistor is: 225/(1 – 70%) = 750 W, with resistance being 50 Ω.
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