Introduction to the performance of AC brake motors

AC brake motors are also called general reduction motors with braking devices. AC brake motor The rear cover is equipped

AC brake motors are also called general reduction motors with braking devices. AC brake motor The rear cover is equipped with a friction disc and an excitation coil made of asbestos wear-resistant material. When the motor is de-energized, the brake spring presses the friction disc against the machined surface of the motor rear cover through the pressure plate, generating a strong frictional torque to achieve braking. When the excitation coil is energized, an electromagnetic attraction is generated, the spring pressure plate is attracted, and the pressure plate is separated from the friction plate. The friction disc is released, and the motor rotates flexibly. Depending on the power of the AC brake motor, the coil resistance is between tens and hundreds of ohms.

　　

　　The braking time of an AC brake motor is the time from the moment the motor and brake are de-energized to the moment the shaft completely stops. Generally, the braking time for motors of size 63~80 frames is 0.5 seconds, for motors of size 90~132 frames is 1 second, and for motors of size 160~180 frames is 2 seconds.

　　

　　AC brake motors are mainly suitable for vertical motion transmission, and braking only requires an external 12~24VDC. When the stepper motor is de-energized, the brake is activated instantly, fixing the motor shaft and solving the problem of the motor remaining locked when the stepper motor is de-energized. Currently, two-phase or three-phase AC brake motors can be equipped with braking devices.

　

　　AC brake motors require high-precision positioning. As a brake motor, it should have the characteristics of rapid braking, accurate and reliable positioning, interchangeable braking system, simple layout, and convenient replacement and maintenance. Many AC brake motor manufacturers require brake motors to control the motor's inertia, achieve the required positioning, and realize automatic operation of the machine.

　　

　　Layout principle of AC brake motor: When the power is off, the brake armature is released, the spring resets the armature to compress the conflict disc, and the motor shaft is held by the conflict disc, and the brake holds the load. AC brake motors will wear out during use. Good brake pads will wear out, maintaining good braking force. However, under conditions of long-term frequent use, the wear and tear of the brake should be checked to avoid ineffective braking. The inspection technique is to open the motor cover and adjust the brake gap to 0.4-0.7mm. If the wear is too tight, it is recommended to replace the brake assembly.

　　

　The AC brake motor has an electromagnetic brake at the tail. When the motor is energized, it is also energized. At this time, it will not brake the motor. When the motor is de-energized, it is also de-energized. The AC brake motor uses a spring to brake the motor. When measuring the open-circuit voltage of the rotor, the rotor is stationary, the rotor winding is open-circuited, the starting resistor is disconnected, the rated voltage is applied to the stator winding, and the line-to-line voltage between the rotor slip rings is measured. For speed motors with a rated voltage higher than 500 volts, the voltage applied to the stator winding can be appropriately reduced.

　　

　　The above AC brake motor is the end of the introduction, hoping it will be helpful to you. If you have more questions about choosing an AC brake motor, please contact us, and we will provide you with more suitable AC brake motor products.