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The characteristics of stepper motors and using experience

The characteristics of stepper motors and using experience

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1. What is a stepper motor? Under what circumstances should a stepper motor be used?

Stepping motor is an actuator that converts electrical pulses into angular displacement. Means: When the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle in the set direction.You can control the angular displacement by controlling the number of pulses, so as to achieve the purpose of accurate positioning; at the same time, you can control the speed and acceleration of the motor rotation by controlling the pulse frequency, so as to achieve the purpose of speed regulation. Therefore, stepper motors can be considered when accurate positioning or speed control is required.

 

2. What is holding torque (static torque)?

Holding torque (static torque), usually the torque of a stepper motor at low speed is close to the holding torque. The greater the holding torque, the stronger the load capacity of the motor. Since the output torque of a stepper motor decays continuously with the increase of speed, and the output power also changes with the increase of speed, the holding torque has become one of the important parameters to measure the stepper motor. For example, when people say a 2N.m stepper motor, it refers to a stepper motor with a holding torque of 2N.m unless otherwise specified.

 

3. What is the accuracy of the stepping motor? Does it accumulate?

Generally, the accuracy of a stepper motor is 3-5% of the step angle. The deviation of a single step of the stepper motor will not affect the accuracy of the next step, so the accuracy of the stepper motor does not accumulate.

 

4. Why does the torque of a stepping motor decrease with the increase in speed?

When the stepper motor rotates, the inductance of each phase winding of the motor will form a back electromotive force; the higher the frequency, the greater the back electromotive force. Under its action, the phase current of the motor decreases with the increase of frequency (or speed), resulting in a decrease in torque.

 

5. How to adjust the rotation direction of the two-phase stepper motor after power-on in a simple way?

Just swap the A+ and A- (or B+ and B-) of the motor wiring to the driver.

 

6. What is the difference between the series connection method and the parallel connection method of the 8-wire two-phase drive combined stepping motor and the driver?

The series connection method is generally used in occasions where the motor speed is low. Parallel connection method is generally used in occasions where the motor speed is high (also known as high-speed connection method)