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HomeNewsKnow about the concepts of "subdivision" and "step angle" of stepper motors

Know about the concepts of "subdivision" and "step angle" of stepper motors

2020-09-12
To understand the "subdivision" of the Stepper Motor driver, we must first clarify the concept of the "step angle" of the Stepper motor.
The step angle is the mechanical viewpoint that the rotor has rotated about a pulse signal without a reduction gear.
The step angle of the stepping motor indicates the point of view that the stepping motor scrolls every time the control system sends a pulse signal. In other words, the point of view at which the rotor rotates for each input pulse signal is called the pitch angle. It can also be described like this: every time the stator control winding changes the energization method, it is called a beat. The mechanical viewpoint at which the rotor turns at each beat is called the step angle, which is usually expressed by θs. The common ones are 3°/1.5°, 3.6°/1.8°. For example, for a stepping motor (small motor) with a step angle of 1.8 degrees, the number of pulses used for one revolution is n=360/1.8=200 pulses.
The error of the step angle will not accumulate for a long time, and only corresponds to the number of input pulse signals. It can form an open-loop control system with a simpler structure and a certain degree of accuracy, and it can also form a closed-loop system when higher precision is required.
After giving an example to clarify the step angle, we can understand this concept more clearly.
For example, the value given by the stepper motor is 7.5°/15° (indicating that it is 7.5° for half-step operation and 15° for full-step operation), this step angle can be called the "motor inherent step angle", it It is not necessarily the actual step angle of the stepper motor in actual operation, the actual step angle is related to the driver.

What is the breakdown of the drive?
In short, the number of subdivisions means that the true step angle when the stepper motor is running is a fraction of the inherent step angle (full step). It can be seen from the following table: when the drive is operating in 10 subdivision conditions, its step angle is only one tenth of the "motor inherent step angle", that is to say: when the drive is operating in a full step without subdivision When the control system sends out a step pulse, the motor rolls 1.8°; when the subdivision driver is used in the 10 subdivision condition, the motor only rolls 0.18°. This is the basic concept of subdivision.
A more accurate description of the subdivision characteristics of the drive is the number of running beats, which refers to the number of pulses required for each tooth pitch when the stepper motor is running. A certain motor has 50 teeth. If the number of running beats is set to 160, then a total of 50×160=8000 steps are required for one revolution of the stepper motor; the corresponding step angle is 360°÷8000=0.045°. Please note that if the number of running beats is set to 30, the corresponding subdivision number according to the above table is 7.5, not an integer.
The subdivision function is completely generated by the driver by accurately controlling the phase current of the stepper motor, and has nothing to do with the stepper motor.

Shenzhen Maintex Intelligent Control Co., Ltd.
Business Type:Manufacturer
Product Range:DC Motor , AC Motor , Stepper Motor
Products/Service:Stepper Motor , Brushless motor , Dc motor , treadmill used motor , Brushed Dc Motor , Fuji motor
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Company Address:Zhengde Science Park, No. 8, Pingdi Street, Longgang District, Shenzhen, Guangdong, China

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