Working principle of brake motor

Publish Time:

2020-07-21

Brake motors, also known as braking asynchronous motors or electromagnetic power-off braking motors, are self-cooling, fully enclosed, squirrel-cage asynchronous motors with an added DC electromagnet brake. Currently, brake motors on the market are mainly divided into several categories: Taiwan brake motors, domestic YEJ series braking motors, European and American brake motors, imported brake motors, and ABB brake motors. Generally, there is an electromagnetic brake at the tail of the brake motor. Its working principle is that when the motor is energized, the DC current in the coil generates suction, separating the two friction surfaces at the tail, allowing the motor to rotate freely. Conversely, the spring restoring force will cause the motor to brake. When the motor is energized, it is also energized and engaged, and at this time, it does not brake the motor. When the motor is de-energized, it is also de-energized, and the brake is braked by the spring, thus realizing the main function of the brake motor. The brake motor and the motor synchronously input 380V AC power. Two wires connect the two AC input terminals of a full-bridge rectifier to the two DC output terminals of the motor. The braking excitation coil has a coil resistance generally ranging from tens to hundreds of ohms, depending on the motor power. The DC disc brake of the electromagnetic braking motor is generally installed on the end cover of the non-shaft extension end of the motor. When the braking motor is connected to the power supply, the brake will also start working. Due to the electromagnetic attraction, the electromagnet attracts the armature and compresses the spring. At this time, the brake disc will be separated from the armature end cover, and the motor will start to rotate. If the power supply is cut off, the electromagnet of the brake will lose its magnetic attraction, and the spring will push the armature to press the brake disc. Under the action of the frictional torque, the motor of the brake motor will immediately stop rotating.

Brake motors, also known as braking asynchronous motors or electromagnetic de-energized braking motors, are self-cooling, fully enclosed, squirrel-cage asynchronous motors with an added DC electromagnet brake. Currently, brake motors on the market are mainly divided into several categories: Taiwan brake motors, domestic YEJ series braking motors, European and American brake motors, imported brake motors, and ABB brake motors.

Generally, there is an electromagnetic brake at the rear of the brake motor. Its working principle is that when the motor is energized, the DC current in the coil generates a suction force that separates the two friction surfaces at the rear, allowing the motor to rotate freely. Conversely, the spring restoring force will cause the motor to brake. When the motor is energized, it is also energized and engaged, and at this time, it does not brake the motor. When the motor is de-energized, it is also de-energized, and the brake is braked by the spring, thus realizing the main function of the brake motor.

The brake motor and the motor synchronously input 380V AC power. Two wires connect the two AC input terminals of a full-bridge rectifier to the two DC output terminals of the motor. The braking excitation coil has a coil resistance generally ranging from tens to hundreds of ohms, depending on the motor power.

The electromagnetic brake of the braking motor, a DC disc brake, is generally installed on the end cover of the non-shaft extension end of the motor. When the braking motor is connected to the power supply, the brake will also start working. Due to the electromagnetic attraction, the electromagnet attracts the armature and compresses the spring. At this time, the brake disc will separate from the armature end cover, and the motor will start to rotate. If the power supply is cut off, the electromagnet of the brake will lose its magnetic attraction, and the spring will push the armature to press against the brake disc. Under the action of the frictional torque, the motor of the brake motor will immediately stop rotating.

In the field of industrial automation and mechanical equipment, brakes are core components that ensure safe operation and precise control. Their performance directly affects production efficiency and personnel safety. AC brakes, as braking devices driven by AC power, play an irreplaceable role in various industrial scenarios due to their high efficiency, reliability, and rapid response.

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