The braking methods of the motor mainly include mechanical braking and electric braking. Mechanical braking is to use mechanical devices to hook the motor shaft to decelerate. For example, electromagnetic brakes often use electric braking in applications. Commonly used electric braking methods are :

1. Short-circuit braking

When braking, the winding of the electromagnetic brake is short-circuited, and the resistance of the winding itself consumes energy. Because the resistance of the winding is small, the energy consumption is fast, there is a certain degree of danger, and the motor may be burned.

2. Reverse connection brake

If the DC motor is braked, the positive and negative poles of the motor power supply are reversed, and the direction of the armature current is changed, the direction of the torque will also change, so that the direction of the speed and the torque are opposite. The electromagnetic brake generates counter torque by changing the phase sequence, and the principle is similar. Reverse connection braking has strong braking force, fast braking, simple control circuit, less equipment investment, but poor braking accuracy, strong impact during braking, and easy damage to transmission components.

3. Energy consumption braking

When the electromagnetic brake is braking, the resistor is connected in series with the winding of the motor. The motor is equivalent to a generator, which converts the energy it has into electrical energy and consumes it on the resistor connected in series. This method is widely used in various motor brakes, and also uses frequency conversion control.

4. DC braking

Mainly used for inverter control. When a DC voltage is applied to the stator of the electromagnetic brake, the output frequency of the inverter is zero at this time. At this time, a static constant magnetic field of the stator is generated, and the rotating rotor cuts off the magnetic field to generate a braking torque, which makes the rotor of the motor stop quickly. The kinetic energy accumulated by the motor is converted into electric energy, which is consumed in the rotor circuit of the stepping motor.

5. Energy regenerative braking

When the active inverter technology is used to control the electromagnetic brake, the regenerative power during braking is inversely converted into AC power in the same phase with the grid and sent to the grid, and the power is consumed to the grid to achieve braking. As the advantages of the energy regeneration device system are far superior to energy consumption braking and DC braking, in recent years, the characteristics of the combined use of equipment by many users have continuously put forward the requirements for the equipment of energy regeneration devices.

6. Parallel capacitor brake

When the rotating motor needs to be braked, the original power input is cut off, and the charged electric energy capacitor is connected to the servo motor windings, and the DC magnetic field is generated in the motor through the discharge of the electromagnetic brake motor winding, and the motor rotor is braked by the DC magnetic field, and the capacitor is also used. The structure is convenient for field replacement, improves the electric braking effect, and improves the reliability of the electromagnetic brake actuator.