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Stepping motor gage pointer zero-returning method

A technology of instrument pointer and stepper motor, which is applied in the direction of instrument, indication of measured value, and operation through zero adjustment method, which can solve the problems of noise, pointer jitter, and unreliable zero return.

Inactive Publication Date: 2008-12-31
SHANGHAI DELCO ELECTRONICS & INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the pointer returns to zero, if the speed is too high, it will cause the pointer to shake, the noise is large, the pointer rebounds, and the zero return is unreliable.
However, if the speed is too low, it will cause jitter and noise when returning to zero.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] A method for returning the pointer of a stepping motor to zero includes the following steps:

[0017] 1) Set the zero return angle, acceleration angle, running angle, and deceleration angle of the indicator pointer. The sum of the acceleration angle plus the running angle plus the deceleration angle equals the zero return angle; set the zero return angle to 320 degrees For example, set the acceleration angle, running angle, and deceleration angle to 15 degrees, 300 degrees, and 5 degrees, respectively.

[0018] 2) Accelerating step, accelerating the driving meter pointer to complete an acceleration angle of 15 degrees; in this embodiment, every 1 degree of the pointer is an acceleration process. In an acceleration, the stepper motor runs a total of 12 microsteps. By reducing the time between each microstep, the stepper motor speed is increased. The pointer runs 15 degrees to make 15 accelerations. The speed from small to large finally stabilizes at a higher operating speed....

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PUM

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Abstract

The invention discloses a zero returning method for a meter needle of a stepper motor, which comprises the steps of: 1) the setting of a zero returning angle, an acceleration angle, an operating angle and a deceleration angle of the meter needle, wherein, the zero returning angle is equal to the acceleration angle plus the operating angle and plus the deceleration angle; 2) acceleration: the meter needle is driven to operate by acceleration to complete the acceleration angle; 3) operating: the meter needle is driven to operate by the speed after the step 2) to complete the operating angle; 4) deceleration: the speed after the step 3) is decelerated to zero and the meter needle is driven to operate to complete the deceleration angle. The method divides the zero returning of the needle into three stages, and leads the needle to complete the zero returning process smoothly, thus not only reducing the wobble of the needle, but also effectively reducing the noise during the zero returning, and avoiding the occurrence of the phenomena, such as the rebounding of the needle, and unreliable zero returning, etc.

Description

Technical field [0001] The invention belongs to the technical field of meters using stepping motors, and particularly relates to a method for returning a pointer of a stepping motor to zero. Background technique [0002] Existing instruments usually use stepping motors to control and drive the indicator pointer. The stepping motor has two driving modes: step mode and micro step mode. The step-by-step method has a large step angle and a small torque. When applied to an instrument, it is easy to cause the pointer to run unsmoothly and cause greater noise. The micro-step method has a small step angle, and when applied to an instrument, the pointer runs smoothly and the noise is relatively small. In order to achieve a better running effect, a gearless stepper motor driven by a microstep method is usually used in the instrument. [0003] The signal required to drive the stepper motor in the microstep mode is provided by the pulse width modulation (PWM) drive module. It can choose the ...

Claims

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Application Information

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IPC IPC(8): G01D3/06G01D13/22
Inventor 杨毅汪丁旺瞿敏
Owner SHANGHAI DELCO ELECTRONICS & INSTR
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