How to brake the brushless DC motor

Date:2018-03-31 Author: Click:

Brushless DC motor braking is usually two simple ways to use the motor for rapid braking. One is energy-consuming braking. The other is short-circuit braking. The dynamic braking consumes the kinetic energy of the motor externally. On brake resistors, shorting the brakes consumes the kinetic energy of the motor on the stator windings of the motor. Obviously, dynamic braking is more advantageous for reducing motor heating. However, short-circuiting the brake does not require any changes to the hardware. Its simplicity and convenience are its outstanding advantages.

The so-called short-circuit braking means that the upper arm (or lower arm) of the drive MOS tube of the motor can be turned on while the lower arm (or upper arm) of the motor is turned off. The three-phase stator winding of the motor can be turned off. All are shorted. The motor in the power generation state is equivalent to the power supply being short-circuited. Because the resistance of the winding is relatively small, a large short-circuit current can be generated, and the kinetic energy of the motor is rapidly released, so that the motor instantaneously generates a large braking torque, and the effect of rapid braking can be achieved. The higher the speed of the motor, the greater the short-circuit current and the greater the braking force. However, it must be considered that it cannot exceed the capacity of the MOS tube. Therefore, it is generally required to wait for the motor speed to decrease to a certain extent before using the short-circuit brake.

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