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Device and method for determining absolute reference zero point of high-precision motor

A determination device, high-precision technology, applied in the direction of motor control, electrical components, control systems, etc., can solve the problem of not meeting the accuracy requirements, achieve the effect of low error rate, overcome the non-unique detection zero position, and high accuracy

Active Publication Date: 2021-03-23
NANJING ANKE MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, neither of these two solutions can meet the occasions with high precision requirements, such as the translational movement of the detector of the CT machine.

Method used

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  • Device and method for determining absolute reference zero point of high-precision motor
  • Device and method for determining absolute reference zero point of high-precision motor
  • Device and method for determining absolute reference zero point of high-precision motor

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Experimental program
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Effect test

Embodiment 2

[0038] Such as figure 2 As shown, two strain gauges are respectively installed on both sides of the spring steel, and connected to the first and second bridge arms of the circuit. When the load contacts the spring steel, the resistance values ​​of the strain gauges of the first and second bridge arms both occur change, R 1 to R 1 -ΔR 1 , R 2 to R 2 -ΔR 2

[0039] Set the reference voltage U 参考电压 = 5V, R 1 = R 2 = R 3 = R 4 =120Ω, ΔR 1 =20Ω, ΔR 2 =19Ω, when the object is at the zero position, the resistance R of the strain gauge 1 at this time 1 -ΔR 1 =120Ω-20Ω=100Ω, resistance R of strain gauge 2 2 -ΔR 2 =120Ω-19Ω=101Ω, so

[0040] The magnification of the signal conditioning circuit is set to 100 times (according to the actual measured voltage range, adjust the magnification of the signal conditioning circuit so that the sampled voltage value is within an appropriate range and the accuracy can be improved), so when the motor is at zero, At this time, th...

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Abstract

The invention discloses a device and method for determining the absolute reference zero point of a high-precision motor. The device comprises a motor, a lead screw, a rack and a detection system, andis characterized in that a static part of the rack is provided with spring steel extending outwards, a resistance strain gauge is pasted on the surface of the spring steel, a motor rotor is connectedwith the lead screw, the lead screw is provided with a load, when the load moves to an absolute reference zero position along with the lead screw, the load makes contact with the spring steel, the spring steel and the resistance strain gauge deform, the resistance change of the resistance strain gauge is converted into the change of a voltage signal through a bridge circuit arranged in the detection system, and the voltage value detected at the moment is set to be zero point voltage, and is used as a reference preset value when the motor returns to zero. According to the method, when the loaddoes not make contact with the spring steel, the situation that the voltage reaches the set value is avoided, and then the error rate is low; and the problems of zero point errors, low precision and the like existing in mechanical locked-rotor current detection and mechanical switch zero point position detection at present are solved.

Description

technical field [0001] The invention relates to the technical field of motor motion control, in particular to a device and method for determining an absolute reference zero point of a high-precision motor. Background technique [0002] The motor movement uses the encoder to record the position. The encoder is divided into an absolute encoder and an incremental encoder. Since the absolute encoder can record the historical position when the power is off, it can be in the historical position after power on again. The motion control is performed on the basis of the absolute encoder, but the price of the absolute encoder is high, and the incremental encoder is generally used in the scene. Although the incremental encoder is relatively cheap, it cannot store the current position after power-off, so it is necessary to find an absolute reference zero point every time the power is turned on again. precision. [0003] Determining the absolute reference zero point is generally achiev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/024H02P29/032
CPCH02P29/024H02P29/032
Inventor 杨琴琴胡广
Owner NANJING ANKE MEDICAL TECH CO LTD
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