The solution to increase the dynamic torque is considered from the speed-torque characteristics below. When the torque is increased, the solution is different depending on the speed. The solution is both motor and drive circuit.
1. Method for increasing torque of stepping motor at low speed
1) Select a stepper motor with a small step angle
At low speeds, the torque increases as the number of teeth in the rotor increases. 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
3) The 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.
2. Method for increasing torque of stepping motor at high speed
1) Reduce the number of turns and reduce L
In the standard products of the motor manufacturer, the inductance L is selected to be small, and the rated current is increased.
In order to keep the input at the same time at the low speed, change the speed-torque characteristics of the two-phase HB type stepping motor with a number of winding turns. At high speeds, the higher the rated current (the same number of turns, the smaller the number of turns), the greater the motor torque (the motor is two-phase, HB type, 1.8°, 56 mm, length 54 mm).
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 to improve the speed at high speed. The moment, while the response frequency also increases.
3) Select the motor with the step angle.
3. Method for improving torque in driving circuit when stepping motor runs at high speed
1) Increase the voltage of the drive current
To maintain high torque at high speeds, keep the current constant and operate the chopper 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 when the drive circuit is turned off
When the current in the coil 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 there is usually a protection circuit.
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