Principle of stepper motor _ two phase four-wire stepping motor design
1. First needed to determine the stepper motor load torque. Stepper motor driver stepper planetary gear motor can't directly to the power frequency ac or dc power supply work, and must use a dedicated driver, as shown, it is controlled by pulse generating unit, power drive unit, protection unit, etc. Figure midpoint line surrounded by two units can be done with microcomputer control. The simple method is on the load shaft with a lever, with the spring ( 春天) Scale pull the lever and pulling force times the length of the lever is not only the load torque. Or according to the load characteristic is theoretically calculated. Due to the stepping motor is controlled, so the current commonly used stepping motor torque is less than 45 nm, torque, the greater the costs ( 成本) Is higher, if you choose the planetary gear motor torque is larger or more than this range ( 足总 n我们 i) , can consider to add with speed reducer. Determine the stepper motor of high running speed. Speed indicator in the selection of step motor is crucial, the characteristics of the stepper motor is with the increase of motor speed, torque is reduced, the lower speed is related to many parameters, such as: motor drives the driving voltage, phase current, the phase inductance, the size of machine and so on, the general rule is: the higher the driving voltage, torque reduce the slower; The slower the motor phase current, the greater the torque to reduce. In design, should make the motor speed control in 600 r/min, or within 800 r/min, say that is not standard, of course, you can refer to the < moment - Frequency characteristics>. Depending on the load heavy torque and high rotational speed of these two important indicators, then refer to 'the moment - Frequency characteristics>, you can choose the suitable stepper motor. If you think you choose the motor is too big, can consider to add reduction gear, so that we can save cost, also can make your design more flexible. To choose appropriate reduction ratio, to considering the relationship between torque and speed, choose the better one. Consider leaving (after Such as 50%) Torque allowance allowance and rotational speed. Can choose first hybrid stepping motor, if due to price factors, you can pick and choose the reactive stepper motor. Select subdivision driver as far as possible, and make the drive to work in the state of segment. Select and when not to only look at this one index of the motor torque error, that is not the motor torque is bigger, the better, want to consider with speed indicator. Subminiature drives and micro drive is to rely on the shell as a radiator ( Reduce the heat produced during the equipment operation) , should be fixed in the larger, thicker plates or additional fan cooling, if there is no cooling conditions ( 蒂雅 阿贾 n) , and drive to work in place of rotational speed is low, Then drive fever is bigger) , you can choose 90 type drive instead of with fan.
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