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A stepping motor lost step detection method

A technology for stepping motors and detection methods, applied in the direction of motor generator control, electrical components, control systems, etc., can solve the problems of stepping motors such as lost steps, and achieve the effect of saving costs

Active Publication Date: 2017-02-01
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of accurately judging the lost step of the stepper motor without installing an encoder

Method used

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  • A stepping motor lost step detection method
  • A stepping motor lost step detection method
  • A stepping motor lost step detection method

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

[0021] This embodiment discloses a method for detecting lost steps of a two-phase stepping motor.

[0022] see figure 2 and Figure 4 , the present invention is as figure 1 Based on the open-loop drive circuit of the stepper motor shown, a closed-loop drive control method capable of detecting lost steps of the stepper motor is proposed.

[0023] The drive circuit includes a two-phase (A-phase and B-phase) stepper motor. The stepper motor is driven by a ...

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Abstract

The invention provides a method for detecting step omitting of a stepping motor. All phases of currents of the stepping motor are detected. When distortion of all the phases of currents meets the preset condition, it is judged that the stepping motor omits steps. The phase currents of the stepping motor are detected in the following mode: a section of constantan wire with the accurate resistance value is connected into each phase of loop of the stepping motor in series. Current signals at the two ends of each constantan wire are amplified through an amplification unit. High-frequency harmonic components, generated by the switch element effect, in the current signals are filtered out through a filter unit. Analog signals of the collected currents are converted into digital signals through an AD converter. Electrical isolation of a sampling detection circuit is achieved through a photoelectric coupler. Another method includes the steps that the current signals are directly transmitted to a digital signal controller; the preset condition for judging step omitting of the stepping motor is that in the process that the stepping motor rotates by one stepping angle, a practical phase current is out of the preset scope.

Description

technical field [0001] The invention relates to the field of motors, in particular to the step-lost detection of stepping motors. Background technique [0002] Stepping motor is an actuator that converts stepping pulse signal into angular displacement, and is often used in precise positioning occasions. In the case of non-overload, the speed and stop position of the motor only depend on the frequency and number of step pulse signals, and are not affected by load changes. When the stepping motor driver receives a stepping pulse signal, it drives the stepping motor to rotate a fixed angle (that is, the step angle) in the set direction. However, when the stepper motor encounters special conditions such as sudden load changes and low-frequency oscillation of the rotor, there will be a phenomenon that the number of steps forward of the motor rotor is less than the number of stepping pulse signals, resulting in position control errors. This phenomenon is called stepping. Into th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P8/34
Inventor 刘和平周宇涂郁潇颖赵宗政曾宇航程章格谷若雨李雨蔓李志闯余传祥邓力
Owner CHONGQING UNIV
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