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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: 2022-06-24
NANJING ANKE MEDICAL TECH CO LTD
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  • 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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Embodiment 2

[0038] like figure 2 As shown in the figure, two strain gauges are 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 becomes R 1 -ΔR 1 , R 2 becomes 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 tim...

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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 includes a motor, a lead screw, a frame and a detection system. The static part of the frame is provided with spring steel protruding outward. The surface of the spring steel The resistance strain gauge is attached, the motor rotor is connected to the lead screw, and the load is set on the lead screw; when the load moves to the absolute reference zero position with the lead screw, the load contacts the spring steel, and the spring steel and the resistance strain gauge are deformed. The bridge circuit converts the change of the resistance value of the resistance strain gauge into the change of the voltage signal, and sets the detected voltage value at this time as the zero point voltage, which is used as a reference preset value when the motor returns to zero. The method of the present invention does not cause the voltage to reach the set value when the load does not touch the spring steel, so the error rate is low; it solves the zero point error and low accuracy of the current detection of mechanical stall current and the detection of the zero point position of the mechanical switch And other issues.

Description

technical field [0001] The invention relates to the technical field of motor motion control, in particular to a device and a method for determining the absolute reference zero point of a high-precision motor. Background technique [0002] The motor movement uses the encoder to record the position, and the encoder is divided into absolute encoder and incremental encoder. Since the absolute encoder can record the historical position in the case of power failure, it can record the historical position after the power is turned on again. Motion control is carried out on the basis of , but the price of absolute encoder is high, and incremental encoder is used in general scenarios. Although the incremental encoder is relatively cheap, it cannot store the current position after power failure. Therefore, 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 ach...

Claims

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Application Information

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Patent Type & Authority Patents(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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