Servo motor functions and braking methods

There are certain techniques and methods for debugging servo motors, which we introduced in detail last time. There are actually three braking methods for servo motors, each of which has its own advantages and characteristics. Next, I will explain to you the functions and braking methods of the servo motor. I hope it will be helpful to you!

Braking method:

The servo motor is a type of CNC equipment invented to adapt to the development trend of digital control. It acts as an execution element in the automatic control system. It converts the received electrical signal into an angular displacement or angular velocity output on the motor shaft. Its main feature is that there is no rotation when the signal voltage is zero, and the rotation speed decreases at a constant speed as the torque increases. Generally, users are easily confused about the functions of electromagnetic braking, regenerative braking and dynamic braking of servo motors, ing to the selection of wrong accessories.

The dynamic brake is composed of a dynamic braking resistor. It uses energy braking to shorten the mechanical feed distance of the servo motor during faults, emergency stops, and power outages; regenerative braking means that the servo brakes when decelerating or parking. The generated energy is fed back to the DC bus through the inverter circuit and absorbed through the resistance-capacitance circuit; electromagnetic braking locks the shaft of the motor through mechanical equipment.

The difference between the three:

1. Regenerative braking must work only when the server is operating normally. It cannot brake the motor in case of failure, emergency stop, power outage, etc. Dynamic brakes and electromagnetic brakes do not require power when operating.

2. The regenerative braking operation is performed automatically by the system, while the operation of dynamic brake and electromagnetic braking requires external relay control.

3. The electromagnetic brake is usually started after SV, OFF, otherwise it may cause amplifier overload. The dynamic brake is usually started after SV, OFF, or the main circuit is powered off, otherwise it may cause the dynamic braking resistor to overheat.

Function:

The servo motor is used as a micro motor for the execution components in automatic control equipment. It is also called an execution motor. Its function is to convert the electrical signal into the angular displacement or angular velocity of the rotating shaft. Servo motors are divided into two categories: AC and DC. AC servo motors operate on the same principle as AC induction motors. There are two excitation windings Wf and control windings WcoWf with a phase space displacement of 90° electrical angle on the stator, which are connected to a constant AC voltage. The AC voltage or phase change applied to Wc is used to control the operation of the motor. AC servo motors have the characteristics of stable operation, good controllability, fast response, high sensitivity, and strict nonlinearity indicators of mechanical characteristics and adjustment characteristics. The operating principle of DC servo motor is the same as that of general DC motor.