DC servo motor and its characteristics

Update:11 Jan 2021

Features: smaller rotor diameter, large axial size, small moment of inertia, so fast response time. But the rated torque is small, generally must match with the gear speed reducer. It is used in small CNC machine tools with high speed and light load.
1. Basic structure of DC servo motor
The figure shows the structure of DC servo motor, mainly including stator, rotor, brush and commutator
2. Classification of DC servo motor
1) According to the different structure of the motor itself, it can be divided into the following categories:
The improved DC servo motor has smaller moment of inertia, stronger overload capacity and better commutation performance.
The small inertia DC motor can reduce the moment of inertia of the rotor to the maximum and obtain the best fast performance.
Permanent magnet DC servo motor can work for a long time with large overload torque, large moment of inertia, no loss of excitation circuit, and can operate at low speed.
Brushless DC motor is composed of synchronous motor and inverter, and the inverter is controlled by rotor position sensor installed on the rotor.
2) According to the different excitation modes of DC motor to excitation winding, it can be divided into four types: separate excitation, parallel excitation, series excitation and compound excitation.

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