The stepper motor drive system consists of a stepper motor and a stepper motor driver. The performance of the stepper motor drive system depends not only on the performance of the stepper motor itself, but also on the advantages and disadvantages of the stepper motor driver. At the same time, the research on stepper motor driver and the research of stepper motor are almost synchronous, so stepper motor driver has an important position in the automotive power system.
The main function of the stepper motor driver subdivision is to improve the accuracy of the stepper motor. There are some drivers in China that use “smoothing†to replace subdivisions, some of which are also called subdivisions, but this is not a true subdivision and is essentially different.
1. "Smoothing" does not precisely control the phase current of the motor, but only slows the rate of change of the current, so "smoothing" does not produce microsteps, and subdivided microsteps can be used for precise positioning.
2. When the phase current of the motor is smoothed, it will cause the motor torque to drop, and the subdivision control will not cause the motor torque to drop. On the contrary, the torque will increase.
Key advantages of drive segmentation
The low frequency oscillation of the motor is completely eliminated. Low-frequency oscillation is an inherent characteristic of stepper motors (especially reactive motors), and subdivision is the only way to eliminate it. If the stepper motor sometimes works in the resonance zone (such as arcing), the subdivision drive is the only one. s Choice. The output torque of the motor is increased. Especially for a three-phase reactive motor, the torque is increased by about 30-40% compared to when it is not subdivided. Improve the resolution of the motor. Since the step angle is reduced and the uniformity of the step is improved, it is self-evident that "increasing the resolution of the motor".
LIN Stepper Motor Driver Solutions
The higher the subdivision of the stepper motor driver, the higher the accuracy of the stepper motor?
This is a wrong concept. For example, the stepping motor driver can be divided into 60,000 pulses and one revolution, and the stepping motor can not distinguish this precision. When the driver is set to 60,000 pulses/rev, the stepper motor driver accepts several pulses. Stepper motor takes one step, which does not improve the accuracy of the stepper motor.
The subdivision technology of the stepping motor is essentially an electronic damping technology. Its main purpose is to reduce or eliminate the low frequency vibration of the stepping motor. Improving the running accuracy of the motor is only an incidental function of the subdivision technology. The actual step angle at which the motor is running after subdivision is a fraction of the base step angle.
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