Common electrical braking methods for electromagnetic brakes

The braking methods for motors mainly include mechanical braking and electrical braking. Mechanical braking uses a mechanical device to engage the motor shaft to reduce speed, for example, electromagnetic brakes often use electrical braking in applications.

Motor braking methods mainly include mechanical braking and electrical braking. Mechanical braking uses a mechanical device to engage the motor shaft to reduce speed. For example, electromagnetic brakes often use electrical braking in applications. Commonly used electrical braking methods include:

1. Short-circuit braking

During braking, the windings of the electromagnetic brake are short-circuited, and the energy is consumed by the resistance of the windings themselves. Because the resistance of the windings is small, the energy consumption is fast, and there is a certain degree of danger, which may burn out the motor.

2. Reverse connection braking

If braking a DC motor, reverse the positive and negative poles of the motor power supply to change the direction of the armature current, and the direction of the torque will also change, making the direction of speed and torque opposite. The electromagnetic brake uses a change of phase sequence to generate a reverse torque, the principle is similar. Reverse connection braking has strong braking force, fast braking, simple control circuit, and low equipment investment, but the braking accuracy is poor, the impact force during braking is strong, and it is easy to damage the transmission parts.

3. Energy consumption braking

When the electromagnetic brake is braking, a resistor is connected in series with the motor windings, and the motor acts as a generator, converting the existing energy into electrical energy consumed by the series-connected resistor. This method is widely used in various motor brakes and also utilizes variable frequency 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, and a stationary stator magnetic field and a rotating rotor are generated at this time, cutting the magnetic field to generate a braking torque, causing the motor rotor to stop quickly, converting the kinetic energy stored in the motor into electrical energy, and consuming it in the rotor circuit of the stepping motor.

5. Regenerative braking

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

6. Parallel capacitor braking

When the rotating motor needs to be braked, the original power supply input is cut off, and the capacitor charged with electrical energy is connected to the servo motor winding. The capacitor is discharged through the electromagnetic brake motor winding to generate a DC magnetic field in the motor, and the DC magnetic field brakes the motor rotor. The structure is easy to replace on site, improves the effect of electric braking, and improves the reliability of the electromagnetic brake actuator.