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Stepper motor

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Stepper motor
Stepper motor
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Stepper motor

  1. 1. PERMENANT MAGNET VARIABLE RELUCTANCE MOTOR MOTOR STEPPER MOTOR HYBRID MOTOR
  2. 2. PERMANENT MAGNET MOTOR Cutaway diagram of a typical permanent magnet stepper motor.
  3. 3. Canstack rotor that is used in permanent magnet stepper motors.
  4. 4. VARIBLE RELUCTANCE STEPPER MOTORS • Does not use permanent magnets, so the field strength can be varied. • The amount of torque for this type of motor is still small, so it is generally used for small positioning tables and other small positioning loads. • Since this type of motor does not have permanent magnets, it cannot use the same type of stepper controller as other types of stepper motors.
  5. 5. HYBRID MOTOR • The hybrid stepper motor is the most widely used and combines the principles of the permanent magnet and the variable reluctance motors. • Most hybrid stepper motors have two phases and operate on the principle used to explain the 12-step motor previously.
  6. 6. Hybrid stepper motor combines features of the permanent magnet stepper and the variable reluctance stepper motors.
  7. 7. STAPPER MOTOR ADVANTAGE • 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 to 5% of a step and this error is non-cumulative from one step to the next. • Excellent response to starting/stopping/reversing.
  8. 8. • Very reliable since there are no contact brushes in the motor. Therefore the life of the step motor is simply dependent on the life of the bearing. • The stepper 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.

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