Rotational speed of step motor is defined by pulse rate and its rotational angle is defined by the amount of pulses. These digital signals enable open loop control, which does not require feedback structure. On the other hand the unit step angle is defined by the mechanical structure of a rotor and a stator. The step motor is also called Stepping Motor, Stepper or Pulse Motor because no unified name is established. Tamagawa Seiki Co., Ltd. unifies to call it Step Motor.
- Capable of controlling precise position in the open loop
・Rotational angle is proportional to the number of input pulses.
・Rotational speed is proportional to the input pulse rate (pulse frequency).
・Angle error (Positioning error) is very small and is not accumulated.
- Capable of holding the static position stable by self-holding torque
・Biggest self-holding torque (Holding torque) is generated in the state of exciting the motor windings.
・Even in the state of non-exciting, some self-holding torque (Detent torque) is generated because the permanent magnet is used.
- Capable of responding fast to the starting, stopping and reversing with its superior acceleration
- No maintenance is needed for the mechanical wear as is often the case with brushes for DC motors
- A merit of 5-Phase Step motors
5-phase step motors have the superior characteristics of resolution, vibration, performance and others compared with 2-phase step motors.
- High resolution
0.72° for full step and 0.36° for half step. These are the resolution of 2.5 times compared with 2-phase step motors.
- Low vibration and smooth rotation, because the torque ripple is small and the variation of operating torque is extremely small.
- Fast response
The out of synchronization caused by resonance is rare in the range of low and middle rotational speed unlike the conventional 2-phase step motor, and it is capable of controlling the fast positioning by means of slow-up and slow-down the step resolution is 2.5 times as accurate as the conventional step motors.