Connection method of servo motor and reducer

The servo motor is a micro motor used as an actuator in an automatic control device. It can also be called an actuator motor. Its function is to convert electrical signals into the angular displacement or angular velocity of the rotating shaft.

Servo motors can be divided into two categories: AC and DC. AC servo motors work 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 change of AC voltage or phase 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 working principle of DC servo motor is the same as that of general DC motor.

The reducer is an independent component composed of gear transmission, worm transmission, and gear-worm transmission enclosed in a rigid shell. It is often used as a reduction transmission device between the original moving parts and the working machine. It plays the role of matching speed and transmitting torque between the prime mover and the working machine or actuator. It is widely used in modern machinery.

Normally servo system manufacturers do not produce reducers. Therefore, the reducer configured for the servo motor is basically a reducer from other brands. This reducer is a reducer specially designed for the servo motor. So what are the connection methods between servo motors and reducers in production? Please read the detailed introduction below!

Connection method of reducer and servo motor:

1. Holding method - the output shaft of the servo motor extends into the reducer, and the servo motor and the reducer are connected through a flange. There is a deformable hoop inside the reducer. By operating the locking screw on the reducer, the hoop can hold the servo shaft tightly. Therefore, for this connection method, the servo motor does not require a keyway (of course it can also have a keyway, but the cost and delivery time of ordering a servo with a keyway is generally relatively long).

2. Connect through an external coupling. This connection method uses an external coupling, so it requires a servo and a keyway. External couplings can also use flexible couplings (flexible shafts) - the driving power of the flexible shaft generally does not exceed 5.5KW, and the rotation speed can reach 20,000 rpm. Generally speaking, servo motors without brakes and without keyways are the ones that are used and have the inventory from suppliers. Therefore, ordering servo motors with brakes and without keyways requires a relatively long delivery time, about 4 weeks.