Common problems and solutions for stepper motors
1. How to control the direction of a stepper motor?
1. Can change the direction level signal of the control system.
2. The direction can be changed by adjusting the motor wiring. The specific steps are as follows:
For a two-phase motor, you only need to swap the motor wires of one phase with the driver, such as swapping A+ and A-.
For a three-phase motor, swap the motor wires of two adjacent phases. For example, in a three-phase motor (A, B, C), swapping phases A and B will solve the problem.
2. Why does the stepper motor vibrate and make a lot of noise?
This situation occurs because the stepper motor is operating in the oscillation zone. Solution:
1. Change the input signal frequency CP to avoid the oscillation region.
2. Use a microstepping driver to reduce the step angle and make the operation smoother.
Third, why doesn't the stepper motor run after being powered on?
The following are some reasons why a motor might not turn:
1. Overload stall (the motor will make a whistling sound at this time)
2. Is the motor in an offline state?
3. Check if the control system is sending pulse signals to the stepper motor driver, and whether there are any wiring issues.
4. What should I do if the stepper motor vibrates and cannot run continuously?
In this situation, first check if the motor windings and driver are connected incorrectly.
Check if the input pulse signal frequency is too high, or if the frequency ramping/scaling design is unreasonable.
5. In what situations is the offline signal FREE of a hybrid stepper motor driver typically used?
When the FREE signal is low, the current output from the driver to the motor is cut off, and the motor rotor is in a free state (offline state). In some automated equipment, if it is required to directly rotate the motor shaft (manual mode) without disconnecting the driver, the FREE signal can be set low to take the motor offline for manual operation or adjustment. After manual operation is completed, the FREE signal is set high again to resume automatic control.
VI. How to select a power supply for a stepper motor driver?
Determine the power supply voltage of the driver, and then determine the operating current; the power supply current is generally determined based on the driver's output phase current I. If a linear power supply is used, the power supply current can generally be taken as 1.1 to 1.3 times I; if a switching power supply is used, the power supply current can generally be taken as 1.5 to 2.0 times I.
7. How to select the power supply voltage for a stepper motor driver?
Stepper motor drivers are all wide-range input voltage drivers, allowing for a wide selection of input voltage. The power supply voltage is typically selected based on the motor's operating speed and response requirements. If the motor operates at a higher speed or requires a faster response, a higher voltage is preferable. However, it's crucial that the power supply voltage ripple does not exceed the driver's maximum input voltage; otherwise, it may damage the driver. Choosing a lower voltage promotes smoother stepper motor operation and reduces vibration.
8. Does the microstepping value of a microstepping driver represent its precision?
Microstepping, also known as fine stepping, primarily aims to reduce or eliminate low-frequency vibrations in stepper motors. Improving the motor's operational accuracy is merely a secondary function of microstepping technology. For example, for a two-phase hybrid stepper motor with a step angle of 1.8°, if the microstepping driver is set to 4 microsteps, the motor's operational resolution is 0.45° per pulse. Whether the motor's accuracy can reach or approach 0.45° depends on other factors, such as the microstepping driver's microstepping current control accuracy. The accuracy of microstepping drivers from different manufacturers can vary significantly; the higher the microstepping number, the more difficult it is to control the accuracy.
9. Why does the torque of a stepper motor decrease as its speed increases?
When a stepper motor rotates, the inductance of each phase winding generates a back electromotive force (EMF); the higher the frequency, the greater the back EMF. Under its influence, the phase current of the motor decreases as the frequency (or speed) increases, resulting in a decrease in torque.
