What Is A Torque Motor?

- Jun 28, 2019-

What is a torque motor?

The so-called torque motor is a flat multi-pole permanent magnet DC motor. The armature has more slots, commutator counts and series conductors to reduce torque ripple and speed pulsation. The torque motor has two types: a DC torque motor and an AC torque motor.

Among them, the DC torque motor has a small self-inductance reactance, so the responsiveness is very good; its output torque is proportional to the input current, independent of the speed and position of the rotor; it can be directly connected to the load at a low speed when it is close to the locked state. Without gear reduction, a high torque-to-inertia ratio can be produced on the shaft of the load and the system error due to the use of the reduction gear can be eliminated.

The AC torque motor can be divided into synchronous and asynchronous. The commonly used squirrel-cage asynchronous torque motor has the characteristics of low speed and large torque. Generally, an AC torque motor is often used in the textile industry, and its working principle and structure are the same as those of a single-phase asynchronous motor. However, since the squirrel-cage rotor has a large electrical resistance, its mechanical characteristics are soft.