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Position estimation method, motor control device, and motor system

A technology of motors and sensor devices, which is applied in the direction of electronic commutator and motor parameter estimation/correction, and can solve the problems of increasing manufacturing costs and difficulty in miniaturization of motor systems

Pending Publication Date: 2021-03-19
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These position sensors make it difficult to miniaturize the motor system, increasing its manufacturing cost

Method used

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  • Position estimation method, motor control device, and motor system
  • Position estimation method, motor control device, and motor system
  • Position estimation method, motor control device, and motor system

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Experimental program
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Embodiment approach

[0082] 1. Feature matching

[0083] In a non-limiting exemplary embodiment, the position inference method of the present disclosure infers the rotational position of a rotor in a motor having a rotor and a stator. The motor has a sensor device that outputs an electrical signal that changes periodically according to the rotation of the rotor. A typical example of the sensor device is a non-contact magnetic sensor that converts a magnetic field generated in a motor into an electric signal and outputs it, such as a Hall element or a Hall IC.

[0084] Figure 9 It is a flowchart showing the processing procedure of the position estimation method according to the embodiment of the present disclosure. This position estimation method is a method installed in a computer, and the computer specifies the divided area where the rotor is located by executing at least the following processing (1) to processing (3). In addition, "steps" enclosed in parentheses in each process indicate ...

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Abstract

The position estimation method according to the present disclosure includes: obtaining learning data from a storage medium storing the learning data including a sequence of a plurality of measurementvalues specifying the waveform feature of a first electric signal output from a sensor device when a rotor rotates; sequentially obtaining a sequence of a plurality of detection values specifying thewaveform feature of a second electric signal output from the sensor device when the rotor rotates; determining a segment region related to the current mechanical position of the rotor by performing matching between the sequence of the plurality of measurement values and the sequence of the plurality of detection values; and, when the matching is not completed within a predetermined time, determining that a motor is in an abnormal state.

Description

technical field [0001] The present application relates to a method of estimating the mechanical angle of a rotor with high accuracy. In addition, the present application also relates to a motor control device and a motor system. Background technique [0002] A motor such as a permanent magnet synchronous motor generally has a rotor having a plurality of magnetic poles, a stator having a plurality of windings, and a magnetic sensor such as a Hall element or a Hall IC that senses magnetic flux formed by the magnetic poles of the rotor. When it is necessary to measure the physical rotational position (mechanical angle) of the rotor with high precision, a position sensor such as a rotary encoder or a resolver is used. These position sensors make it difficult to miniaturize the motor system, increasing its manufacturing cost. [0003] Japanese Laid-Open Publication No. 2002-112579 discloses a phase detection device that estimates the phase (electrical angle) of a rotor from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/16H02P23/14
CPCH02P23/14H02P6/16
Inventor 居超高江刚一福村友博
Owner NIDEC CORP