Motor and electric apparatus equipped with a conductive pin for suppressing electrolytic corrosion

• US 7,456,533 B2
• Filed: 06/20/2005
• Issued: 11/25/2008
• Est. Priority Date: 02/23/2005
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nanbu, Yasuo, Kumagai, Yuji, Sengokudani, Yoshikazu
• Primary Examiner(s): Tamai; Karl I
• Application Number:
  US11/156,517
• Publication Number:
  US 20060186746A1
• Time in Patent Office: 1,254 Days
• Field of Search: 310/68.R, 310/89, 310/90, 310/196, 310/43, 310/216, 310/71
• US Class Current: 310/71
• CPC Class Codes: H02K 11/40 Structural association with grounding devices
• CPC Class Codes: H02K 5/15 Mounting arrangements for bearing-shields or end plates
• CPC Class Codes: H02K 5/1732 radially supporting the rotary shaft at both ends of the rotor H02K5/1737 takes precedence

Abstract

A motor comprises a stator having a stator core and a stator winding wound on the stator core and integrally molded with insulation resin, a rotor provided with a shaft, a first bearing and a second bearing for supporting the shaft, a bracket connected to the stator and retaining at least one of the first bearing and the second bearing, and a conductive member short-circuiting between the stator core and the bracket.

Claims

1. A motor comprising:

a stator having a stator core and a stator winding wound on the stator core along a wound surface of the stator core and integrally molded with insulation resin, the integrally molded insulation resin defining a channel;

a rotor provided with a shaft;

a first bearing and a second bearing for supporting the shaft;

a bracket connected to the stator and retaining at least one of the first bearing or the second bearing; and

a solid conductive pin configured to be disposed in the channel of the molded insulation resin for providing a short-circuit between the stator core and the bracket such that a first end of the solid conductive pin bites into the wound surface of the stator core and a second end of the solid conductive pin bites into the bracket,

wherein the insulation resin extends from an edge of the wound surface of the stator core such that the solid conductive pin projects toward the bracket from a portion of the edge of the wound surface and a portion of the extended insulation resin.

2. The motor of claim 1, further comprising a further bracket, wherein both of the first bearing and the second bearing are retained by the bracket and further bracket.

3. The motor of claim 2, said motor included in an electric apparatus which further includes a blower fan driven by the motor.

4. The motor of claim 1 further comprising a housing formed on the stator, wherein the first bearing is retained by the housing, and the second bearing is retained by the bracket.

5. The motor of claim 4, said motor included in an electric apparatus which further includes a blower fan driven by the motor.

6. The motor of claim 1, wherein the integrally molded stator has at least one notch in an outer periphery thereof, and a part of the stator core is accessible through the notch.

7. The motor of claim 6, said motor included in an electric apparatus which further includes a blower fan driven by the motor.

8. The motor of claim 1, wherein the motor is driven by an inverter using a pulse-width modulation method.

9. The motor of claim 8, said motor included in an electric apparatus which further includes a blower fan driven by the motor.

10. The motor of claim 1, said motor included in an electric apparatus which further includes a blower fan driven by the motor.

11. The motor of claim 1, wherein the insulation resin and the stator core form the channel and a bottom surface of the channel such that the insulating resin forming the bottom surface supports the conductive pin that extends past the edge of the stator core.

12. The motor of claim 1, wherein each of the first and second ends include biting means for biting into the wound surface of the stator core and the bracket, respectively, when the bracket is press-fit to the stator.