What is the difference between DC and AC brakes?

When the motor brake is a DC and AC brake, the power supply type used for motor braking is different, and the motor brake will be caused by different types of power supplies used by the motor brake.

When the motor brake is DC and Exchange brake The power supply types used for motor braking are different, and the motor brake will be caused by different types of power supplies used by the motor brake.

　　There are some differences between DC and AC brakes.

　　1. DC braking generally refers to when the inverter's output frequency is close to zero and the motor speed is reduced to a certain value, the inverter changes to the stator winding of the asynchronous motor to pass through DC to form a static magnetic field. In this state, the rotating rotor cuts off the static magnetic field to generate braking torque, so that the motor stops quickly.

        

　(1) AC brakes are suitable for AC motors - Features: If the motor does not rotate, the braking power supply needs to be removed immediately.

　(2) AC brakes use DC braking. Features: Use the force generated by cutting to stop the motor, the speed is slow.

　2. Electromagnetic braking motors have two structures: conical rotor structure and electromagnetic braking slider structure. After the motor is energized, the conical rotor overcomes the spring force and rotates away from the braking friction disc

　 The braking performance of the motor is mainly evaluated from the following aspects:

　(1) AC brake braking efficiency, that is, the braking distance (or braking deceleration) of the motor, is evaluated by the braking distance from the motor to the parking position at a certain initial speed on a good plane;

　(2) Stability of AC brake braking efficiency, that is, the anti-regression performance of the brake, refers to the degree to which the braking performance is maintained during continuous braking under heavy load. Motor speed rotation;

　(3) Directional stability of the AC brake motor during the braking process, that is, the performance of the motor during the braking process is free from deviation, skidding and no steering ability. It is evaluated that the motor meets the requirements during normal braking.

　　3. In practical applications of AC brakes, appropriate braking methods should be selected according to the working characteristics of the equipment. For example, brakes are frequently used in cranes, such as crane traveling motors and electric brakes.

　　4. Exchange brake Power voltage, current and motor power remain unchanged, the current will increase, the current through the brake will increase, the heat will increase, the time will be long, the wiring inside the brake will age or age. May be burned out. Adjust the motor power, the torque will become smaller. Although it will not affect the equipment, the workload will be greatly reduced.