Moving body system and method for driving moving body

Patent metadata

Field	Value
Publication number	US-9871478-B2
Application number	US-201414785779-A
Country	US
Kind code	B2
Filing date	Apr 3, 2014
Priority date	Apr 22, 2013
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

In order to prevent the length of the movement path from being limited to the pitch of a magnet, a moving body (vehicle) includes two motors disposed in different positions in the moving direction. When one of the two motors is located in an irregular section in which the poles of magnets are not disposed regularly, a motor other than the one motor is located in a section which is not the irregular section.

First claim

The invention claimed is:

1. A moving body system comprising:
a rail, wherein the rail comprises a regular section in which magnets with south poles and magnets with north poles are alternately disposed, and an irregular section in which magnets are not disposed, or the magnets with south poles and magnets with north poles are not alternately disposed; and
a moving body configured to move along the rail, wherein the moving body comprises a plurality of motors disposed in different positions in a moving direction thereof,
wherein one of the plurality of motors is located in the irregular section,
wherein at least one of the plurality of motors other than the one motor is located in a section which is not the irregular section,
wherein the moving body comprises a drive controller configured to stop drive of a motor positioned in the irregular section,
wherein the moving body comprises a detector configured to detect the irregular section, the drive controller stops the drive of the motor on a basis of detection of the irregular section by the detector,
wherein the detector detects the irregular section, as well as a regular section in which the poles of magnets are disposed regularly, and when the detector detects the irregular section and then detects the regular section, the drive controller restarts the stopped drive of the motor,
wherein the detector detects the irregular section, as well as the regular section in which the poles of magnets are disposed regularly, by detecting the magnets, and when the detector detects the irregular section and then continuously detects a plurality of magnets starting from a first magnet in the regular section, the drive controller restarts the stopped drive of the motor.

2. The moving body system of claim 1 , wherein the irregular section is a section in which the magnets are not disposed.

3. The moving body system of claim 1 , wherein the irregular section is a section in which the magnets with south poles and magnets with north poles are not alternately disposed.

4. The moving body system of claim 1 , wherein the irregular section is shorter than a distance between motors disposed at both ends in the moving direction of the motors.

5. The moving body system of claim 1 , wherein the detector is provided for each of the motors.

6. The moving body system of claim 1 , wherein the detector is an optical sensor configured to detect the magnets.

7. The moving body system of claim 1 , wherein
the detector comprises one set of sensors, and
the one set of sensors detects the irregular section and a position of the moving body.

8. The moving body system of claim 1 , wherein
the drive controller comprises a bootstrap circuit, and
a bootstrap capacitor of the bootstrap circuit is charged with a charge time corresponding to a time during which the motor has been stopped.

9. A method for driving a moving body, the moving body moving along a rail, wherein the rail comprises a regular section in which magnets with south poles and magnets with north poles are alternately disposed, and an irregular section in which magnets are not disposed, or the magnets with south poles and magnets with north poles are not alternately disposed, the method comprising:
when one of a plurality of motors disposed in different positions in a moving direction of the moving body is located in the irregular section, stopping drive of the one motor,
wherein the moving body comprises a drive controller configured to stop drive of a motor positioned in the irregular section,
wherein the moving body comprises a detector configured to detect the irregular section, the drive controller stops the drive of the motor on a basis of detection of the irregular section by the detector,
wherein the detector detects the irregular section, as well as a regular section in which the poles of magnets are disposed regularly, and when the detector detects the irregular section and then detects the regular section, the drive controller restarts the stopped drive of the motor,
wherein the detector detects the irregular section, as well as the regular section in which the poles of magnets are disposed regularly, by detecting the magnets, and when the detector detects the irregular section and then continuously detects a plurality of magnets starting from a first magnet in the regular section, the drive controller restarts the stopped drive of the motor.

10. The moving body system of claim 7 , wherein
the one set of sensors detects the presence or absence of a magnet in the irregular section and the position of the moving body.

11. The moving body system of claim 8 , wherein
the charge time corresponding to a time during which the motor has been stopped is the time it takes for the bootstrap capacitor to discharge.

Assignees

• Murata Machinery Ltd

Inventors

• Yamada Yasutake
• Azuma Yoshiyuki

Classifications

• H02P6/15

  Controlling commutation time · CPC title

• H02P6/16

  Circuit arrangements for detecting position · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02P8/005 Primary

  of linear motors · CPC title

• H02K41/031

  of the permanent magnet type · CPC title