Process of measuring the temperature of coil end part and the stator core

• US 8,344,298 B2
• Filed: 01/23/2008
• Issued: 01/01/2013
• Est. Priority Date: 02/08/2007
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Koide, Satoshi, Kimura, Hideaki, Sakao, Masahiko
• Primary Examiner(s): Chambliss, Alonzo
• Application Number:
  US12/526,145
• Publication Number:
  US 20100320194A1
• Time in Patent Office: 1,805 Days
• Field of Search: None
• US Class Current: 219/636
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines

Abstract

In a method of heating a stator, a first induction coil is disposed near one of the coil ends of the stator, and a second induction coil is disposed near the other, and the first induction coil and the second induction coil are electrically energized, whereby the induction-heating of the stator is performed as a pre-heating step prior to the resin molding step of the coil ends. According to this method, a first movement unit for moving the first induction coil and a second movement unit for moving the second induction coil are provided, the first induction coil is moved by the first movement unit and the second induction coil is moved by the second movement unit for induction-heating of the stator.

Claims

1. A method for heating a stator formed such that a conducting coil is mounted on a stator core formed of laminated steel sheets, the method comprising:

disposing a first induction coil near one of the coil end parts of the stator and a second induction coil near the other coil end part,

energizing the first induction coil and the second induction coil to induction heat the coil end parts of the stator prior to a resin-molding process or a varnish applying process,

wherein the method further includes;

moving the first induction coil in an axial direction of the stator with a first movement device; and

moving the second induction coil in the axis direction of the stator with a second coil movement device,

measuring temperatures of the coil end part and the stator core of the stator with a temperature measuring device, and

based on a temperature difference between the coil end part and the stator core measured by the temperature measuring device,

moving the first induction coil with the first coil movement device and the second induction coil with the second coil movement device.

2. The method of heating the stator according to claim 1, wherein

if the temperature difference is smaller than a preset value, the first induction coil and the second induction coil are moved close to the stator core with the first coil movement device and the second coil movement device to adjust the temperature of the stator.

3. The method of heating the stator according to claim 2, wherein

if the temperature difference is larger than a preset value, the first induction coil and the second induction coil are moved away from the stator core with the first coil movement device and the second coil movement device to adjust the temperature of the stator.

4. A method for heating a stator formed such that a conducting coil is mounted on a stator core formed of laminated steel sheets, the method comprising disposing a first induction coil near one of the coil end parts of the stator and a second induction coil near the other coil end part,

energizing the first induction coil and the second induction coil to induction heat the coil end parts of the stator prior to a resin-molding process or a varnish applying process,

wherein the method further includes:

moving the first induction coil in an axial direction of the stator with a first coil movement device; and

moving the second induction coil in the axis direction of the stator with a second coil movement device,

wherein the method further includes a control device that controls the first coil movement device and the second coil movement device, and

after a lapse of a predetermined time, the control device controls the first coil movement device to move the first induction coil and controls the second coil movement device to move the second induction coil, and

based on data from the increased temperature of the stator when heated by the first and second induction coils which have not yet been moved is obtained in advance and the predetermined time is determined based on the data.

5. A device for heating a stator formed such that a conducting coil is mounted on a stator core formed of laminated steel sheets, the device comprising:

a first induction coil to be disposed near one of coil end parts of the stator and a second induction coil to be disposed near the other coil end part, the first induction coil and the second induction coil being arranged to be energized to induction heat the coil end parts of the stator prior to a resin-molding process or a varnish applying process,

wherein the device further includes;

a first coil movement device that moves the first induction coil in an axial direction of the stator;

a second coil movement device that moves the second induction coil in the axis direction of the stator; and

a control device that controls the first coil movement device and the second coil movement,

the device for heating a stator includes a temperature measuring device that measures temperatures of the coil end part and the stator core of the stator, and

the control device is adapted to control, based on a temperature difference between the coil end part and the stator core measured by the temperature measuring device, the first coil movement device to move the first induction coil and the second coil movement device to move the second induction coil.