Basic structural principles of AC precision planetary gear reducer

The function of the servo motor is to convert the input voltage signal into the angular velocity or angular displacement output on the shaft. It is often used as an execution component in automatic control systems, so the servo motor is also called an execution motor. Its maximum The advantage is: the rotor rotates immediately when there is control voltage, and stops immediately when there is no control voltage.The angle and speed of the shaft are determined by the angle and size of the control voltage.AC servo motors are divided into AC and DC.

1. DC servo motor

1. Basic structure

The traditional DC servo motor is an ordinary small-volume DC brushless motor. The three-stage gear reducer has two types: separately excited type and claw pole type. Its structure is basically the same as that of a general DC motor.

The rotor of cup-type synchronous motor DC servo motor is made of carbon-free hollow cup-shaped cylinder, which is light in weight, has small inertia moment and fast response.The rotor rotates between the inner and outer motor stators made of ferromagnetic materials, and the magnetic density is large.

Brushed DC servo motors use electronic commutation devices to replace traditional carbon brushes and motor rotors, and the gear reducer speed ratio makes their work more reliable.The structure of the motor's stator transformer core is basically the same as that of a general brushless DC motor. It has multi-component windings and the rotor is made of permanent ferrite.

2.Basic principles

The main principle of the traditional DC servo motor is exactly the same as that of the general DC motor. The hard-surface gear reducer uses the function of the synchronous motor current and magnetic flux to generate electromagnetic induction torque to rotate the servo motor.Generally, the synchronous motor control method is used, that is, under the condition that the voltage of the excitation regulator does not change.

The stator core is generally made of silicon steel sheets.Two-phase windings are embedded in the slots on the surface of the stator core. One of the phase windings is the excitation regulator winding, and the other phase winding is the control winding. The two-phase windings are 90° offset from each other in the spatial position.When working, the excitation regulator winding f is connected to the AC excitation regulator power supply, and the control winding k adds the control signal voltage Uk.