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Method for controlling gearless step motor in application of instrument

A control method and gear step technology, applied in the direction of motor generator control, control system, electrical components, etc., can solve the problems of small torque, large step angle, uneven pointer operation, etc., and achieve the effect of low cost and smooth operation

Inactive Publication Date: 2010-01-27
SHANGHAI DELCO ELECTRONICS & INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The step-by-step method has a large step angle and a small torque, and when it is applied to an instrument, the pointer does not run smoothly and the noise is large

Method used

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  • Method for controlling gearless step motor in application of instrument
  • Method for controlling gearless step motor in application of instrument
  • Method for controlling gearless step motor in application of instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The motor involved in the present invention is a precision stepping motor with a gearless structure inside. The precise torque is generated by the internal magnetic field to drive the motor to operate accurately, thereby realizing the control and driving of the instrument pointer. This motor works in the meter as follows:

[0015] When power on for the first time, adopt step-by-step zero return method, the zero return angle is 300 degrees, and the zero return speed is fast;

[0016] After ignition, adopt step-by-step zero return method, the zero return angle is 10-20 degrees, and the zero return speed is fast;

[0017] Normal operation, PWM micro-step walking, the minimum walking part is 1 / 13 degrees, and the walking part is very smooth;

[0018] After the flame is turned off, the PWM microstep method returns to zero.

[0019] The following is based on Figure 2 ~ Figure 3 A preferred embodiment of the present invention is given and described in detail to make it eas...

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Abstract

The invention discloses a method for controlling a gearless step motor in application of an instrument. The method comprises the following steps: firstly, establishing a micro-step driving current waveform diagram; secondly, calculating corresponding current vectors according to current values in the micro-step driving current waveform diagram; then, simulating the current vectors by pulse width modulated (PWM) waves; and finally, using a timer to trigger the PWM waves with different duty cycles to drive a pointer according to required time intervals, wherein the process of driving the pointer is divided into a plurality of stages according to speed, and the pointer of the instrument is controlled to accelerate or decelerate by different current vectors corresponding to the stages. The method has the advantages of smooth running of the pointer, no noise and low cost.

Description

technical field [0001] The invention relates to a control and driving method using a gearless stepping motor as an instrument pointer. Specifically, the invention relates to a control method for driving pointers of various pointer indicating instruments. Background technique [0002] In traditional instruments, mechanical or cross coils are generally used to drive the pointer to the desired position. This kind of driving method is usually more complicated than the mechanical structure, the processing difficulty is high, the indication accuracy and stability are poor, and the indication resolution is very low. Therefore, it is necessary to set a retaining needle on the dial to ensure the zero position, which increases the production cost and process difficulty. With the development of technology, stepper motors with gears began to appear as pointer drives. This type of motor drives the pointer with an internal gear drive, which improves resolution. However, due to the inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P8/22
Inventor 杨毅徐朱翔
Owner SHANGHAI DELCO ELECTRONICS & INSTR