STATOR

• US 20120086292A1
• Filed: 06/08/2010
• Published: 04/12/2012
• Est. Priority Date: 06/17/2009
• Status: Active Grant

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ishida, Kenji, Yamada, Eiji
• Granted Patent: US 8,653,708 B2
• Time in Patent Office: Days
• US Class Current: 310/71
• CPC Class Codes: H02K 11/25 Devices for sensing temperature, or actuated thereby

Abstract

In the stator, a thermistor housed in a tube is arranged to be sandwiched between a coil end and a U-phase bus bar, allowing the thermistor to receive heat from above and below at two faces, that is a face of the U-phase bus bar and a top face of the coil end. Moreover, the thermistor can be placed substantially in close contact with the coil end. Accordingly, the temperature followability by the thermistor can be realized at high accuracy. As a result, there can be provided a stator having a configuration in which temperature followability of high accuracy can be achieved in measuring the temperature of a coil of a stator using a temperature detection element, and that can correspond to further downsizing of a rotating electric machine.

Claims

1. A stator configured by arranging a plurality of stator cores in an annular manner, each stator core having a stator coil wound around a stator tooth, said stator comprising:

a bus bar provided above a coil end of said stator core, and connecting said stator cores of the same phase, and

a temperature detection element for detecting a temperature of said stator,

said temperature detection element arranged so as to be sandwiched between said coil end and said bus bar,

said bus bar having a structure for holding said temperature detection element,

said bus bar having a cross section of an arc shape with a recess facing said temperature detection element,

said temperature detection element including a thermistor and a tube for housing said thermistor, and

a dimensional relationship of expression (1) and expression (2) set forth below being established;

R₀<

R₂<

R₁ 

 

(1)

2×

R₀<

L₁<

2×

R₁ 

 

(2)

where R₀ is a radius of a cross section of said thermistor, R₁ is the radius of a cross section of said tube, R₂ is a radius of curvature of said bus bar at an inner face side, and L₁ is a distance between an inner face of said bus bar and a top end face of said coil end.

2. (canceled)

3. (canceled)

4. A stator configured by arranging a plurality of stator cores in an annular manner, each stator core having a stator coil wound around a stator tooth, said stator comprising:

a neutral point terminal provided above a coil end of said stator core, at each phase of said stator coil,

a neutral point connection bar connecting said neutral point terminals, and

a temperature detection element for detecting a temperature of said stator,

said temperature detection element arranged so as to be sandwiched between said coil end and said neutral point connection bar,

said neutral point terminal having a structure for holding said temperature detection element,

said neutral point terminal including a parallel portion that is a portion of the neutral point terminal bent outwards so as to be parallel to a top face of said coil end, and

said temperature detection element being arranged so as to be sandwiched between said coil end and said neutral point connection bar, and pass over a top face of said parallel portion.

6. The stator according to claim 4, wherein

said temperature detection element comprises a thermistor and a tube for housing said thermistor, and

a dimensional relationship of expression (3) set forth below is established:

2×

R₀<

L<

2×

R₁ 

 

(3)

where R₀ is a radius of a cross section of said thermistor, R₁ is the radius of a cross section of said tube, and L is a distance between a bottom face of said neutral point connection bar and a top face of said parallel portion.

5. (canceled)

7. A stator configured by arranging a plurality of stator cores in an annular manner, each stator core having a stator coil wound around a stator tooth, said stator comprising:

an input terminal provided above a coil end of said stator core, at each phase of said stator coil, and

a temperature detection element for detecting a temperature of said stator,

said temperature detection element arranged so as to be sandwiched between said coil end and said input terminal,

said input terminal having a structure for holding said temperature detection element,

said input terminal including a base portion fixed to said coil end and extending upwards, a dome portion rounded inwards from said base portion with a predetermined radius of curvature, and an upright portion extending upwards from a leading end of said dome portion.

9. The stator according to claim 7, wherein

said temperature detection element comprises a thermistor and a tube for housing said thermistor, and

a dimensional relationship of expression (4) to expression (7) set forth below is established:

R₃<

R₁ 

 

(4)

R₀<

h₁<

R₁ 

 

(5)

2×

R₀<

h₂<

2×

R₁ 

 

(6)

h₃<

2×

R₁ 

 

(7)

where R₀ is a radius of a cross section of said thermistor, R₁ is the radius of a cross section of said tube, h₁ is a distance from a leading end of said dome portion to a top face of said coil end, h₂ is a projecting length of said base portion from a top face of said coil end, h₃ is a distance from an inner face of said base portion to an inner face of said upright portion, and R₃ is a radius of curvature of said dome portion at an inner side.

8. (canceled)