Advantages and Disadvantages of Permanent Magnet Stepper Motor

A stepper motor is an electro-mechanical device that actuates a train of step movements of a shaft in response to a train of input pulses. The step movement may be angular or linear. The step movement of the motor is according to the input pulse.

The performance of a stepper motor — both in terms of resolution (or step size), speed, and torque — is influenced by construction details, which at the same time may also affect how the motor can be controlled. As a matter of fact, not all stepper motors have the same internal structure (or construction), as there are different rotor and stator configurations.

Advantages and Disadvantages of Stepper Motor

The advantages of a permanent magnet stepper motor are

It is compact and small in size, which makes it useful in many applications

Due to the absence of any external excitation, the losses are less

Due to the absence of any external excitation, the maintenance is less.

It can be connected to the external circuit, to control the speed of the motor

Sensors may be used to locate the rotor windings

Can be operated in a wide range of speed and torque.

Precise Control;

The disadvantages of a permanent magnet stepper motor are

Due to limitations in permanent magnet, it cannot be used for high power applications

Torque produced is limited

The life of a permanent magnet is limited.

The reason why nema 17 hybrid stepper motors rotate 1.8° per step is that the motor only moves a quarter of a tooth pitch per step due to the geometric design between the rotor and stator.  When phase A is excited as the south pole and its stator teeth are directly aligned with the north pole teeth from the rotor, the stator teeth of phase B are actually offset from the teeth of the rotor by 1.8°.  This is called the teeth arrange offset and is the reason why a two-phase hybrid type stepper motor rotates 1.8 ° per step.

Hence we have seen the working principle, constructional aspects, and applications of the permanent magnet stepper motor. It must be noted which magnetic materials are used to improve the performance of these motors and how to control the step angle of the machine? if you need Custom stepper motors, you can contact us.

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Advantages and Disadvantages of PM Stepper Motor