Method to increase stepper motor dynamic torque - News - Global IC Trade Starts Here Free Join

Single chip microcomputer STM32L151CCU6

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SMD aluminum electrolytic capacitor

1. When the stepping motor with a small step angle is selected, the torque becomes larger as the number of teeth of the rotor increases at a low speed. A stepping motor with a small step angle can achieve high torque. If the number of teeth of the HB type rotor is 50 teeth, the leakage magnetism of the permanent magnet will increase, but the step will be proportional. This conclusion is valid below 100 teeth. The three-phase HB type stepping motor is changed from 1.2° (rotor 50 teeth) by 0.6° (rotor 100 teeth). Approximately 1.4 to 1.8 times the low speed torque is increased. 2, bipolar wiring efficiency can be doubled. Two-phase unipolar or bipolar stepper motors are readily available on the market, but bipolar drives have more power tubes than unipolar. The method of increasing the torque of the stepping motor at high speed: 1. Reduce the number of turns, and reduce the L. In the standard products of the motor manufacturer, the selection of the inductance L is small, and the rated current becomes large. 2. The magnetic flux of the permanent magnet should be small. If the production of maternity leave cannot reduce the permanent magnet, the air gap can be increased, the back EMF can be reduced at high speed, the current can be increased, the torque can be increased, and the speed-torque characteristic can be changed from low speed to high speed. In a straight line, the torque at high speed is increased and the response frequency is also increased. 3. When the motor stepping motor with high step angle is selected for high speed operation, the method of increasing the torque in the drive circuit is as follows: 1. To increase the voltage of the drive current to maintain the high torque at high speed, it is necessary to keep the current unchanged. The chopper operates in a constant current state. To keep the current constant, only increase the pulse frequency. When the stepping motor reaches a certain high speed, the voltage can only work in the constant voltage state. If the input voltage is increased, it can still work in the constant current state at high speed. If the input voltage is increased, It can also operate in a constant current state at high speed, thereby increasing the torque at high speed. 2. Reduce the current in the current coil when the drive circuit is turned off. When the power tube is turned off, the current change rate is large, and a very large induced voltage is generated in the coil. The power tube may be broken down and usually has protection. Circuit.