Low cost for control achieved
High torque at startup and low speeds
Simplicity of construction
Can operate in an open loop control system
Less likely to stall or slip
Will work in any environment
Can be used in robotics in a wide scale.
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 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 dependent 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.
Require a dedicated control circuit
Use more current than D.C. motors
Torque reduces at higher speeds
Resonances can occur if not properly controlled.
Not easy to operate at extremely high speeds.