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MOTOR ROTATIONAL POSITION DETECTING DEVICE, MOTOR ROTATIONAL POSITION DETECTING METHOD, and WASHING MACHINE

A technology of rotating position and detection device, which is used in the control of electromechanical transmission device, single motor speed/torque control, other washing machines, etc., can solve problems such as detection of difficult rotating position stability

Inactive Publication Date: 2014-09-10
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since permanent magnet motors are structurally dependent on the vector of the applied current, the salient pole ratio, which is the information required for position estimation, changes due to the occurrence of magnetic saturation and the influence of interference between the dq axes, and sometimes becomes extremely small. , so it may be difficult to perform stable detection of the rotational position

Method used

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  • MOTOR ROTATIONAL POSITION DETECTING DEVICE, MOTOR ROTATIONAL POSITION DETECTING METHOD, and WASHING MACHINE
  • MOTOR ROTATIONAL POSITION DETECTING DEVICE, MOTOR ROTATIONAL POSITION DETECTING METHOD, and WASHING MACHINE
  • MOTOR ROTATIONAL POSITION DETECTING DEVICE, MOTOR ROTATIONAL POSITION DETECTING METHOD, and WASHING MACHINE

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Experimental program
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Embodiment Construction

[0020] Hereinafter, one embodiment will be described with reference to the drawings. figure 2 It is a cross-sectional view showing the structure of a surface permanent magnet motor (SPM motor). The stator 1 is composed of a stator core 2 and a stator winding 3 . The stator core 2 includes, for example, 36 teeth 2b formed to protrude toward the outer peripheral side of the annular main body portion 2a. Three-phase stator coils 3 are wound around these teeth 2b, respectively. On the other hand, the rotor 4 is composed of an annular rotor core 5 and permanent magnets 6 arranged on the outer peripheral side of the stator 1 . A plurality of, for example, 26 permanent magnets 6 have N poles 6N and S poles 6S, and are arranged in a concave portion formed on the inner peripheral side of the rotor core 5 so that the polarities are alternately reversed (N, S, N, S). Thus, the outer rotor type constitutes a 52-pole / 36-slot motor 16 .

[0021] image 3 It is a longitudinal section s...

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Abstract

The present invention relates to a motor rotational position detecting device, a motor rotational position detecting method, and a washing machine. A torque and an exciting current instruction are generated according to inputted control instructions, and outputted; and a voltage instruction is generated according to the torque and the exciting current instruction. An alternate current detection voltage instruction is generated for detecting a rotation position. A motor current vector is converted into exciting / torque factor based on phase angle obtained at any rotation frequency. A position deduction error value is calculated according to the voltage instruction and the converted current. Exciting values outputted so that the rotation position errors obtained are eliminated are stored for the motor to maintain any rotation position and output the torque current instruction in any value. The exciting current instruction corresponding to a torque current instruction generated according to a control instruction of the motor is read out to carry out setting.

Description

technical field [0001] Embodiments of the present invention relate to a device for detecting a rotational position of a permanent magnet motor having magnetic saliency (Japanese: magnetic saliency), a washing machine including the device, and a method for detecting the rotational position of the motor. Background technique [0002] In recent years, in washing machines and the like, vector control of permanent magnet motors has been adopted to improve rotation control accuracy and washing machine performance, and to achieve reductions in power consumption and vibrations generated during operation. In the case of applying vector control to a permanent magnet motor to control it with high precision and high speed, a position sensor is required because the current is controlled based on the magnetic pole control position of the motor. However, if the position sensor is added, in addition to a corresponding increase in cost, there are also problems such as securing an arrangement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14D06F37/30H02P6/16H02P6/06H02P6/08H02P6/17H02P21/00H02P21/18H02P21/22H02P21/24H02P21/28H02P23/16H02P25/026H02P25/03H02P27/04H02P27/08
CPCH02P21/0039H02P6/186H02P21/146H02P21/18H02P21/24
Inventor 日向敏文前川佐理
Owner KK TOSHIBA