The main classification of stepping motor
Stepping motor is an actuator that converts electrical impulses into angular displacement. When stepping drive receives a pulse signal, it is driving a stepper motor according to set the direction of a fixed Angle (called "step Angle"), its rotation is based on the Angle of the fixed step by step. It can control the amount of angular displacement by controlling the number of pulses, so as to achieve accurate positioning. At the same time, the speed and acceleration of the motor can be controlled by controlling the pulse frequency to achieve the goal of speed adjustment. The step motor can be divided into several kinds: permanent magnet step motor: generally two phase, torque and volume are small. Reactive step motor: generally three phases, which can achieve the high torque output; Hybrid stepper motor: an electric motor that is mixed with a permanent magnet and a reactive type. It is divided into two and five phases. This is the most widely used step motor
The step motor is divided into the rotor type: permanent magnet, equation and mixture; The step motor is divided into two phases, three phases and five phases. According to the way of line: four wire system, six wire system and eight wire system. Three-phase step motor: three-wire and six-wire system; The winding connection mode: two phase stepping motor points: single polarity, series and parallel; Three-phase stepping motor points: triangles and stars; Control mode: single polarity and dual wiring; Actuators: special chip, analog and digital. Drives are divided by control circuit: single polarity and bipolar.
The winding is divided into two phases, three phases and five equal series. The most popular is the two-phase hybrid step motor, which accounts for more than 97% of the market share, due to the high price ratio and good performance after the breakdown drive. This kind of motor is the basic step Angle is 1.8 ° / step, step with the upper drive, step away from the Angle of reduced to 0.9 °, deserve to go up after subdivision drive its interval Angle can be subdivided 256 times (0.007 ° / micro step). Because of the friction and manufacturing accuracy, the actual control accuracy is slightly lower. The same step motor can be used with different subdivided actuators to change the accuracy and effect.
There are three main types of stepper motors: the equation of Variable, VR, Permanent Magnet, PM, and Hybrid Stepping, HHS. Equation: the stator has winding and rotor made of soft magnetic material. Simple structure, low cost, step Angle is small, can be up to 1.2 °, but poor dynamic performance, low efficiency, big fever, difficult to ensure reliability. Permanent magnet: the rotor of the permanent magnet step motor is made of permanent magnetic material, and the pole number of the rotor is the same as that of the stator. Is characterized by good dynamic performance, large output torque, accuracy is poor, but the motor torque Angle step big (typically 7.5 ° or 15 °). Combines reactive hybrid, hybrid stepping motor and permanent magnet, the advantages of the multiphase winding on the stator, rotor with permanent magnet materials, have multiple small teeth on the rotor and stator step in order to improve the torque accuracy. The characteristic is that the output torque is large, the dynamic performance is good, the step distance Angle is small, but the structure is complex, the cost is relatively high.
