What happen with BLDC motor when brake applied by shorting the motor terminals?

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Alfonso Gómez-Espinosa

Dear Nikunj Patel,

When brake is applied to BLDC motor, by shorting the motor terminals, electric current must be limited to meet nominal and peak specifications. Otherwise motor degradation may occur. You can use a Braking Resistor or a Dynamic Braking Resistor to limit the braking current.

The braking torque is calculated by multiplying the current and voltage for each motor phase and adding for the three phases.

The Braking force (smooth sudden stop), depend on the control of the braking current.

RPM fluctuation depend on the machine dynamics and braking wave form, a controller could be designed to reduce deceleration time avoiding fluctuations.

Regards,

Alfonso Gómez

Nikunj Patel

Hello Alfonso Gómez-Espinosa,

Thank you very much for the inline answer of the my queries. Now I come to knew basics of it.

Would you please provide some basics information of the braking wave form or source of the information? Thus I able to check the braking characteristics of the BLDC motor (industrial servo motor).

Please find attached a link for Permanent Magnet Synchronous Motors, mathematical foundation is similar to BLDC (replacing Counter-electromotive force, from sinusoidal to trapezoidal).

http://www.mdpi.com/1424-8220/13/3/3831/pdf

An exelent reference for BLDC is:

Brushless Permanent Magnet Motor Design

Dr. Duane Hanselman.

ISBN: 1-881855-15-5