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Method and system for acquiring feedback current of driver of stepping motor

A feedback current and stepping motor technology, applied in the control system, motor generator control, electrical components, etc., can solve the problem that the maximum output torque of the drive motor cannot be changed quickly, achieve precise control, improve control performance, and improve load service Effect

Active Publication Date: 2014-12-24
BEIJING RUNKE GENERAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for obtaining the feedback current of a stepping motor driver, which is used to solve the problem that the accuracy of the feedback current of the stepping motor driver in the prior art is not high, which leads to the inability to quickly change the maximum output torque of the motor driven by the driver , the technical problem of making the stepper motor provide external load

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  • Method and system for acquiring feedback current of driver of stepping motor
  • Method and system for acquiring feedback current of driver of stepping motor
  • Method and system for acquiring feedback current of driver of stepping motor

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Embodiment 1

[0047] refer to figure 2 Shown is a method flow chart of Embodiment 1 of a method for obtaining feedback current of a stepper motor driver provided by the present invention, and the method includes:

[0048] Step 201: Obtain the sampling voltage across the sampling resistor.

[0049] Wherein, the sampling resistor is connected in series with the winding of the stepping motor. When the stepping motor starts, the current on the winding of the stepping motor flows through the sampling resistor to obtain the sampling voltage at both ends of the sampling resistor.

[0050] Step 202: Perform bias amplification processing on the sampling voltage, obtain a bias amplification voltage corresponding to the sampling voltage, and perform analog-to-digital conversion on the bias amplification voltage, and convert the bias amplification voltage into digital signal voltage.

[0051] Step 203: Obtain a feedback current according to the sampling voltage, the digital signal voltage, and the d...

Embodiment 2

[0055] The present invention provides a second embodiment of a method for obtaining feedback current of a stepper motor driver. Based on the first embodiment, the driving parameters during the operation of the stepper motor driver include bias voltage, quantitative dimension of the driver, and modulus Conversion voltage sampling upper limit value and analog-to-digital conversion quantization value, wherein step 203 is specifically:

[0056] The sampling voltage, the digital signal voltage and the driving parameters during the operation of the stepper motor driver are brought into the feedback current calculation formula to obtain the feedback current. The feedback current calculation formula is:

[0057] D. out =(D×AD v ÷ AD S -devi V )÷R×SAP S ×I max ;

[0058] where D is the digital signal voltage, AD v The sampling upper limit value for the analog-to-digital conversion voltage, AD s Quantize the value for the analog-to-digital conversion, devi v is the bias voltage...

Embodiment 3

[0061] refer to image 3 Shown is a method flow chart of Embodiment 3 of a stepping motor driver feedback current acquisition method provided by the present invention. Based on Embodiment 2, the method includes:

[0062] Step 301: Obtain the sampling voltage at both ends of the sampling resistor;

[0063] Step 302: Perform bias amplification processing on the sampling voltage according to the bias voltage to obtain a bias amplification voltage corresponding to the sampling voltage;

[0064] Step 303: Perform analog-to-digital conversion on the bias amplified voltage according to the sampling upper limit of the analog-to-digital conversion voltage and the quantized value of the analog-to-digital conversion, and convert the biased amplified voltage into a digital signal voltage;

[0065] Step 304: Obtain a feedback current according to the sampling voltage, the digital signal voltage and the driving parameters during the operation of the stepper motor driver.

[0066] The spec...

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Abstract

The invention provides a method and a system for acquiring feedback current of a driver of a stepping motor. The method includes the steps: acquiring sampling voltage at two ends of a sampling resistor; performing bias amplification for the sampling voltage, acquiring bias amplification voltage corresponding to the sampling voltage, and performing analog-to-digital conversion for the bias amplification voltage so that the bias amplification voltage is converted into digital signal voltage; and acquiring the feedback current according to the sampling voltage, the digital signal voltage and driving parameters during operation of the driver of the stepping motor. The method and the system for acquiring the feedback current of the driver of the stepping motor take factors such as features of the driver and the like affecting feedback current transmission into the feedback current acquiring process, so that precision of the feedback current is improved, and further control precision of the driver is improved, and the maximum output torque of the motor driven by the driver can be quickly changed to lead the motor to externally provide load service.

Description

technical field [0001] The invention relates to the field of motor technology, in particular to a method and system for obtaining feedback current of a stepper motor driver. Background technique [0002] Stepping motors are widely used in machine tool control, antenna control and industrial automation and other fields. Usually, the driver is set in the stepper motor and adopts the drive technology of the current vector banner uniform rotation method to reduce the torque fluctuation and angular velocity fluctuation of the motor, eliminate low-frequency oscillation, reduce running noise, and improve the service life of the motor. [0003] In the existing technology, such as figure 1 Shown is the current signal flow diagram of the existing stepper motor driver. In the stepper motor drive technology, closed-loop current control is adopted to make the current on the motor winding flow through the sampling resistor. The current feedback module determines the feedback current by t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P8/12
Inventor 陈雷
Owner BEIJING RUNKE GENERAL TECH