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Magnetic sensor system for motor control

A magnetic sensor and magnetic sensing technology, applied in the field of magnetic field sensors, can solve the problem that the position of the rotor and the stator cannot be determined.

Pending Publication Date: 2022-04-08
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is especially useful at startup when no back electromagnetic force (EMF) is available, so the microcontroller cannot determine relative rotor and stator positions

Method used

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  • Magnetic sensor system for motor control
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  • Magnetic sensor system for motor control

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Embodiment Construction

[0035] The need to improve the performance and reduce noise, vibration and harshness, and improve operating efficiency of BLDC motor drives, including electric power steering (EPS) systems, has led to a shift from block commutation to sinusoidal commutation control. The Hall switch can be replaced with a reluctance (MR) angle sensor positioned in front of a magnet mounted on the motor shaft, and the measured position is fed back to the electronic control unit (ECU) to control the rotation of the rotor.

[0036] The present disclosure provides a magnetic sensor system for monitoring the position of a rotor relative to a stator for motor commutation. The system uses two magnetic sensors with oppositely biased magnets configured to detect changes in the direction of a magnetic field caused by the interaction of the magnetic field with two movable targets rotated by a motor shaft. Thus, the unique phase difference between the signals measured by each sensor can be used to determin...

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Abstract

The invention relates to a magnetic sensor system for motor control. The present disclosure provides a magnetic sensor system for monitoring a position of a rotor relative to a stator for motor commutation. The system uses two magnetic sensors with reverse biased magnets configured to detect changes in the direction of the magnetic field caused by the interaction of the magnetic field with two movable targets rotated by the motor shaft. Thus, a unique phase shift between the signals measured by each sensor may be used to determine the relative position between the stator and the rotor. In this aspect, the system utilizes the Nonius or Vernier principle to measure rotational displacement, but the graduation of the encoder is defined by the number of pole pairs of the motor.

Description

technical field [0001] The present disclosure relates to a magnetic field sensor for motor control, and more particularly to a back-biased magnet sensor for monitoring the rotational position of a motor for electronic motor commutation. Background technique [0002] One of the main advantages of a synchronous motor is that the rotation of the magnetic field in the stator aligns with the position of the rotor. Typically, with electronic motor drives, it is beneficial to know the position of the rotor relative to the stator to determine the current direction and frequency to keep the motor synchronized or to drive the motor in the desired direction. [0003] Brushless DC (BLDC) motors typically have a synchronous architecture and, as the name suggests, have no brush contacts. Therefore, position sensors are used to measure the relative position between the stator and rotor to ensure that the correct sequence of energizing the stator coils is used. This is especially useful a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K11/215G01D5/14H02P6/16
CPCG01D5/2452H02K11/215H02K11/35H02K7/003H02K7/116H02K29/08H02P6/16G01D5/16
Inventor J·施密特E·J·尼科尔
Owner ANALOG DEVICES INT UNLTD