Stepper Motor Advantages and Disadvantages

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Stepper Motor Advantages and Disadvantages

Stepper motor with cable

Advantages

The rotation angle of the motor is proportional to the input pulse.
The motor has full torque at standstill (if the windings are energized)
Precise positioning and repeatability of movement since good stepper motors online have an accuracy of 3 – 5% of a step and this error is non cumulative from one step to the next.
Excellent response to starting/stopping/reversing.
Very reliable since there are no contact brushes in the motor. Therefore the life of the motor is simply dependant on the life of the bearing.
The motors response to digital input pulses provides open-loop control, making the motor simpler and less costly to control.
It is possible to achieve very low speed synchronous rotation with a load that is directly coupled to the shaft.
A wide range of rotational speeds can be realized as the speed is proportional to the frequency of the input pulses.

Disadvantages
Resonances can occur if not properly controlled.
Not easy to operate at extremely high speeds.

Open Loop Operation
One of the most significant advantages of a stepper motor is its ability to be accurately controlled in an open loop system.

Open loop control (not closed loop step motor) means no feedback information about position is needed. This type of control eliminates the need for expensive sensing and feedback devices such as optical encoders.
Your position is known simply by keeping track of the input step pulses.

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