Driving method of stepper motor driver

Categories:Company news
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Time of issue:2017-02-25 16:54

(Summary description)The stepping motor cannot be directly connected to the power frequency AC or DC power supply to work, but must use a dedicated driver, as shown in the figure, it is composed of a pulse generation control unit, a power drive unit, a protection unit and so on. The two units enclosed by the dotted line in the figure can be realized by microcomputer control. The driving unit must be directly coupled with the driver (anti-electromagnetic interference), which can also be understood as the power interface of the microcomputer controller, which will be briefly introduced here.

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Driving method of stepper motor driver

(Summary description)The stepping motor cannot be directly connected to the power frequency AC or DC power supply to work, but must use a dedicated driver, as shown in the figure, it is composed of a pulse generation control unit, a power drive unit, a protection unit and so on. The two units enclosed by the dotted line in the figure can be realized by microcomputer control. The driving unit must be directly coupled with the driver (anti-electromagnetic interference), which can also be understood as the power interface of the microcomputer controller, which will be briefly introduced here.

Categories:Company news
Author:
Origin:
Time of issue:2017-02-25 16:54
Views:0

The stepping motor cannot be directly connected to the power frequency AC or DC power supply to work, but must use a dedicated driver, as shown in the figure, it is composed of a pulse generation control unit, a power drive unit, a protection unit and so on. The two units enclosed by the dotted line in the figure can be realized by microcomputer control. The driving unit must be directly coupled with the driver (anti-electromagnetic interference), which can also be understood as the power interface of the microcomputer controller, which will be briefly introduced here.

Dual voltage power drive

Dual voltage driven power interface. The basic idea of dual voltage driving is to drive with lower voltage UL at lower (low frequency band), and drive with higher voltage UH at high speed (high frequency band). This power interface requires two control signals, Uh is a high-voltage effective control signal, and U is a pulse-width-modulated drive control signal. In the figure, the power tube TH and the diode DL constitute a power conversion circuit. When Uh is low, TH is off, DL is forward biased, and low voltage UL powers the winding. Conversely, Uh is high, TH is on, DL is reverse biased, and high voltage UH supplies power to the winding. This circuit allows the motor to have a larger output in the high frequency band, and the power consumption is reduced when the motor is stationary.

Single voltage power drive

A resistor Rs is connected in series in the motor winding circuit, which reduces the time constant of the dual voltage power drive interface of the motor circuit. At high frequencies, the motor can generate large electromagnetic torque, and it can also alleviate the low frequency resonance phenomenon of the motor, but it causes additional loss. In general, Rs is indispensable in simple single-voltage drive circuits. Improvement of single step response of Rs stepper motor

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