Difference Between Dynamic Brake & SB50W Brake

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om_tech_support_JT
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Difference Between Dynamic Brake & SB50W Brake

Postby om_tech_support_JT » Tue Jun 19, 2012 10:14 am

Q: What is the difference between using the dynamic brake (instantaneous stop) function of your driver (or controller) to brake a motor, and using your SB50W brake pack to brake a motor?

A: The dynamic brake function (our manuals refer to this as instantaneous stop) in our drivers brake the motor by turning off current to the motor, and then shorting all phases together hence creating a locked rotor condition. The SB50W brake pack brakes a motor by removing AC from the motor, and then supplying DC to the motor windings to create a stationery magnetic field which stops the motor. Both of these functions are active only for a very short time so there's no holding torque when you brake the motor using these functions. Furthermore, the SB50W is used for frequent start/stop applications with AC motors, while the dynamic brake (instantaneous stop) function is on speed control systems where the motor doesn't stop frequently.

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