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Sensor with dual-way backup signal

A sensor and sensor body technology, applied in the field of sensor technology, can solve the problems of the limitation of the resolver sensor, the poor accuracy of the magnetic sensor, and the inability to continue to operate, and achieve the effect of ingenious implementation, fast response time, and reducing the probability of failure to operate.

Inactive Publication Date: 2018-07-17
SHANGHAI JUNQIAN SENSING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. For existing magnetic sensors and resolver sensors, once the sensors are damaged, electric vehicles and hybrid vehicles using permanent magnet synchronous motors cannot continue to operate
[0009] 2. The traditional magnetic sensor itself has poor precision
[0010] 3. The resolver sensor is limited by its own working principle

Method used

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  • Sensor with dual-way backup signal
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  • Sensor with dual-way backup signal

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Embodiment Construction

[0029] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0030] see figure 1 , which shows the basic structure of a sensor with dual backup signals for a permanent magnet synchronous motor in an example of the present invention.

[0031] It can be seen from the figure that the sensor 100 for permanent magnet synchronous motor with automatic pole alignment function in this example mainly includes a ring magnetic encoder 110 and a sensor body assembly 120 .

[0032] Among them, the magnetic field of the annular magnetic encoder 110 is sinusoidally distributed within a period (multiple periods can be set within 360 degrees of a week), and it is non-contact embedded in the sensor body assembly 120, and can be placed on the sensor body assembly with the target object. Rotates in 120 degrees.

[0033] In ...

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PUM

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Abstract

The invention discloses a sensor with a dual-way backup signal, comprising a magnetic encoder, and a sensor body assembly. The sensor body assembly collects a varying magnetic field generated by a rotary magnetic encoder and synchronously outputs a dual-way absolute quantity signal. The sensor with the dual-way backup signal can make the sensor output two absolute quantity signals being backup toeach other to a controller, thereby greatly reducing the probability that the permanent magnet synchronous motor cannot run due to the sensor signal failure.

Description

technical field [0001] The present invention relates to detection technology, in particular to sensor technology. Background technique [0002] Permanent magnet synchronous motors are widely used in electric vehicles and hybrid vehicles. In actual use, precise speed and torque control of permanent magnet synchronous motors is required. [0003] In the permanent magnet synchronous motor torque expression formula, T∝ψ*i(q), where ψ is the magnetic field strength of the permanent magnet, which is constant, that is, the torque of the motor can be directly controlled by controlling the q-axis stator current. In practical applications, sensors are required to determine the pole positions of permanent magnets. Especially in the case of low-frequency or 0-speed operation, heavy-load start-up, etc., when precise torque control is required, it is more necessary for the position sensor to transmit the magnetic pole position information of the permanent magnet to the controller. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/14
CPCG01D5/142G01D5/145
Inventor 姜泽明
Owner SHANGHAI JUNQIAN SENSING TECH CO LTD
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