What's the difference between a three-phase asynchronous motor and a stepper motor?
Now more commonly used stepper motor, including reactive stepping motor (VR), permanent magnet stepper motor (PM), hybrid stepping motor (HB) and single-phase stepper motorThe permanent magnet stepper motor generally is two-phase, torque and small volume, the stepping angle is generally 7.5 degrees or 15 degrees;The reaction is generally three-phase stepping motor, can achieve high torque output, the step angle is generally 1.5 degrees, but the noise and vibration are large. Rotor magnetic circuit made of soft magnetic materials for stepping motor, a stator phase excitation winding, the permeability changes in torque.The hybrid stepping motor is a mixture of the advantages of permanent magnet type and reaction type. It consists of two phases and the five phase: two-phase step angle of 1.8 degrees while the general five phase step angle of 0.72 degrees. The application of the stepper motor is the most widely used.
Step motor is a kind of electrical pulses into angular displacement of the actuator. When the stepper driver receives a pulse signal, it drives stepper motor to set the direction of rotation of a fixed angle (called "step"), it is the rotation of the fixed point of a step step operation. By controlling the number of pulses to control the amount of angular displacement, so as to achieve the purpose of accurate positioning; at the same time by controlling the pulse frequency to control the motor rotation speed and acceleration, so as to achieve the purpose of speed. Special motor stepper motor control can be used as a, do not use their accumulated error (accuracy 100%) characteristics, widely used in a variety of open-loop control.
Asynchronous motor (induction motor) working principle is through the rotation of the stator magnetic field induced current in the rotor, thereby generating electromagnetic torque, the rotor does not directly generate a magnetic field. Therefore, the rotor speed is less than synchronous speed (not the difference, the slip rate, no rotor current), so called asynchronous motor.
