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Brushless motor, wiper apparatus, motor apparatus, and control method for motor apparatus

a technology of motors and wipers, applied in the direction of control systems, ac motor control, vehicle cleaning, etc., can solve the problems of increased and achieve the effect of effectively utilizing the signals of sensors and suppressing torque ripples at the rotor

Inactive Publication Date: 2016-11-03
MITSUBA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a brushless motor and wiper apparatus that can suppress torque ripples on the rotor. This is achieved by effectively utilizing signals from sensors that detect rotation phases of the rotor. The motor control method corrects signals from one sensor based on the other sensor, resulting in accurate detection of rotation phases. This allows for smoother operation of the motor and wiper apparatus.

Problems solved by technology

The electric motors as described in Japanese Patent Application Laid-Open Publication No. 2007-202391; Japanese Patent Application Laid-Open Publication No. 2007-143278; and Japanese Patent Application Laid-Open Publication No. 2010-93977 have problems that, regardless of whether the electric motor is provided with brushes or not, torque ripples at the rotor are increased depending on control conditions.

Method used

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  • Brushless motor, wiper apparatus, motor apparatus, and control method for motor apparatus
  • Brushless motor, wiper apparatus, motor apparatus, and control method for motor apparatus
  • Brushless motor, wiper apparatus, motor apparatus, and control method for motor apparatus

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Experimental program
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first embodiment

[0058]A vehicle 10 shown in FIG. 1 has a windshield 11. Furthermore, the vehicle 10 has a first wiper apparatus 12 and a second wiper apparatus 13, which wipe off the windshield 11. The first wiper apparatus 12 and the second wiper apparatus 13 are disposed at positions different from each other in the width direction of the vehicle 10. Since the first wiper apparatus 12 and the second wiper apparatus 13 have approximately left-right symmetric structures, hereinafter, the first wiper apparatus 12 will be described for the sake of convenience. The first wiper apparatus 12 has: a wiper arm 15 which swings about a pivot shaft 14; and a wiper blade 16 which is attached to the wiper arm 15. Furthermore, the first wiper apparatus 12 has a motor apparatus 17 serving as a drive apparatus which drives the wiper arm 15. The motor apparatus 17 is provided with: a brushless motor 18; and a speed reduction mechanism 19 which transmits the power of the brushless motor 18 to the pivot shaft 14.

[00...

second embodiment

[0112]The second embodiment is one example of a motor apparatus applied to the vehicle. FIGS. 2-5 and 9 used in the first embodiment will be used also in the second embodiment.

[0113]A vehicle 10 shown in FIG. 15 has a windshield 11. Furthermore, the vehicle 10 has a first wiper apparatus 12 and a second wiper apparatus 13, which wipe off the windshield 11. The first wiper apparatus 12 and the second wiper apparatus 13 are disposed at the positions which are different from each other in the width direction of the vehicle 10. Since the first wiper apparatus 12 and the second wiper apparatus 13 have approximately left-right symmetric structures, the first wiper apparatus 12 will be described hereinafter for the sake of convenience. The first wiper apparatus 12 has: a wiper arm 15 which swings about a pivot shaft 14; and a wiper blade 16 which is attached to the wiper arm 15. Furthermore, the first wiper apparatus 12 has a motor apparatus 17 which drives the wiper arm 15. The motor appa...

example 1

Correction Example 1

[0184]First, with reference to the time chart of FIG. 23, an example which uses the sensor 42 of the V-phase as a reference and corrects the switching signal of the sensor 43 of the U-phase will be described. The switching signals of the sensors 41 to 43 shown in FIG. 23 are the same as the switching signals of the sensors 41 to 43 shown in FIG. 17. The time chart of FIG. 23 shows electric angles by the sections each corresponding to 60° for the sake of convenience.

[0185]As shown by broken lines, the ideal waveform of the switching signal of the sensor 43 is turned on at the electric angle 0°, continues to be on for the section of an electric angle 180°, and is then switched to off at the timing of the electric angle 180°. More specifically, the ideal waveform of the switching signal of the sensor 43 is turned off at the timing of the electric angle 180° (p1) delayed by a section of an electric angle 60° from the timing of the electric angle 120° at which the swi...

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Abstract

A brushless motor (18) which supplies currents to coils (U1, U2, V1, V2, W1, and W2) and rotates a rotor (27), the brushless motor comprising a control apparatus (37) which switches and selectively executes: first energization control to start energization to the coils (U1, U2, V1, V2, W1, and W2) at first timing, and to continue the energization for a first period to control the rotation number of the rotor (27); and second energization control to start energization to the coils (U1, U2, V1, V2, W1, and W2) at second timing advanced by an electric angle with respect to the first timing, and to continue the energization for a second period longer than the first period to control the rotation number of the rotor (27).

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]Applicant hereby claims foreign priority benefits under U.S.C. §119 from International Patent Application Serial No. PCT / JP2014 / 083821 filed on Dec. 22, 2014; Japanese Patent Application No. 2013-267084 filed on Dec. 25, 2013; and Japanese Patent Application No. 2013-267085 filed Dec. 25, 2013, the contents of all of which are incorporated by reference herein.TECHNICAL FIELD[0002]The present invention relates to a brushless motor and a wiper apparatus, each of which has a stator and a rotor, and can control the rotation number of the rotor.[0003]The present invention relates to a motor apparatus having a sensor for sensing a phase in rotation direction of a rotor, and a control method for the motor apparatus.BACKGROUND ART[0004]Examples of conventional electric motors are described in Japanese Patent Application Laid-Open Publication No. 2007-202391; Japanese Patent Application Laid-Open Publication No. 2007-143278; and Japanese Patent App...

Claims

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Application Information

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IPC IPC(8): H02P6/10B60S1/08B60S1/16H02P27/08
CPCH02P6/10B60S1/166B60S1/08H02P27/08
Inventor ANNAKA, TOMOHIKOTANAKA, HIROTOKOJIMA, NAOKIFURUSAWA, TORUKOBAYASHI, TOMOFUMI
Owner MITSUBA CORP