AN3208

Types of stepper motor

Doc ID 17411 Rev 1

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2.2

Permanent magnet (PM) motor

This motor is known as a tin-can or can-stock motor. The permanent magnet stepper motor

is a low cost and low resolution type motor with a typical step angle of 7.5 ° to 15 °. PM

motors use permanent magnets and the rotor does not have the teeth of the VR motor. The

PM motor has improved torque characteristics compared with the VR motor.

Figure 4.

Permanent magnet motor

2.3

Hybrid synchronous motor

The hybrid stepper motor contains features of both the PM and VR motors. Hybrid motors

are more expensive than PM stepper motors but provide better performance regarding step

resolution, torque and speed. Typical step angles for the hybrid motor range from 3.6 ° to 0.9

°.The rotor is multi-toothed like the VR motor and contains an axially magnetized concentric

magnet around its shaft. The teeth on the rotor provide an even better path which helps

guide the magnetic flux to preferred locations in the air gap. This further increases the

detent, holding, and dynamic torque characteristics of the motor compared with both VR

and PM motors.

Figure 5.

Hybrid synchronous motor