Control method and control device of brushless motor

A brushless motor, control method technology, applied in the direction of electronic commutation motor control, control system, electrical components, etc.

Inactive Publication Date: 2002-11-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The control method in this Japanese Patent Laid-Open No. 9-154294 is the same as that in the Japanese Patent Laid-Open No. 7-123773, and can only be applied to surface magnet type brushless motors.

Method used

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  • Control method and control device of brushless motor
  • Control method and control device of brushless motor
  • Control method and control device of brushless motor

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0137] Next, Embodiment 2 of the control device for a brushless motor of the present invention will be described. In the second embodiment, the same process as the above-mentioned first embodiment is performed to detect the crossing time from the detected induced voltage value, the direction of the induced voltage change, and the induced voltage reference value. However, the control device of Embodiment 2 is a device for correspondingly dealing with the case where the calculation of the switching time when it is judged that the intersection time cannot be detected or the time of the calculated switching time has exceeded the switching time Case.

[0138] Hereinafter, a control method in the brushless motor control device according to the second embodiment will be described with reference to FIG. 11 . The configuration of Embodiment 2 is the same as that of Embodiment 1 described above.

[0139] When it is judged that the intersection time cannot be detected from the detectio...

Embodiment 3

[0143] Next, Embodiment 3 of the control device for a brushless motor according to the present invention will be described. In Embodiment 3, even when the cut-off time is short and the intersection time of the induced voltage reference value and the detected induced voltage can be detected during high-speed operation, the intersection time can be obtained by calculation. The control device of Embodiment 3 configured in this way can detect the rotor position with high precision and reduce the disorder of the current waveform even when the cut-off period is short and the delay of one control cycle produces a large angle difference during high-speed operation.

[0144] Hereinafter, a control method of the brushless motor control device according to the third embodiment will be described.

[0145] FIG. 12 is a block diagram showing the structure of a control device for a brushless motor according to Embodiment 3. FIG. In FIG. 12 , the same reference numerals as in Embodiment 1 ar...

Embodiment 4

[0163] Next, Embodiment 4 of the control device for a brushless motor according to the present invention will be described. In the fourth embodiment, when the induced voltage changes due to temperature change or the like, the table value correction of the induced voltage change rate creation circuit is performed. With such a structure, the control device according to the fourth embodiment can normally stably detect the rotational position of the rotor with high accuracy even when the temperature changes.

[0164] Hereinafter, a control method of the brushless motor control device according to the fourth embodiment will be described.

[0165] FIG. 17 is a block diagram showing the structure of a control device for a brushless motor according to Embodiment 4. FIG. In FIG. 17, the same reference numerals as those in FIG. 1 are assigned to the parts having the same configuration as those in the first embodiment, and description thereof will be omitted.

[0166] In the control de...

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Abstract

In the brushless motor control method and control device according to the present invention, the rotor rotational position detection means detects an intersection point as the time when the detected induced voltage intersects with the induced voltage reference value, and the motor speed calculation means detects an intersection point detected by the rotor rotational position detection means. The rotational speed of the brushless motor is calculated at the time interval of the intersection point, the speed control means outputs the energization rate index based on the deviation between the command speed and the rotational speed of the brushless motor, and the switching signal generation means sends a signal to the switching element based on the rotational speed and the energization rate index at the intersection point. Group output switch signal.

Description

Background technique [0001] The present invention relates to a control method and a control device of a brushless motor, and particularly to a so-called sensorless control device that detects the rotational position of a rotor without using magnetic detection means such as a Hall element. [0002] As a conventional technology such as a so-called sensorless control device that detects the rotational position of a rotor in a brushless motor without using a magnetic detection means such as a Hall element, there is a technology disclosed in JP-A-7-123773. [0003] Hereinafter, a conventional brushless motor control device will be described. [0004] 38 is a block diagram showing a system configuration of a conventional brushless motor control device. In FIG. 38 , a brushless motor 101 includes a stator 102 in which phase coils 121u, 121v, and 121w through which current flows are wound around a stator core (not shown), and a rotor 103 in which magnets are attached. Each phase coi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18
CPCH02P6/182
Inventor 田泽徹楢崎和成饭岛友邦松城英夫S·苏布拉塔
Owner PANASONIC CORP
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