Rotary electric machine

• US 5,783,888 A
• Filed: 03/09/1995
• Issued: 07/21/1998
• Est. Priority Date: 03/17/1994
• Status: Expired due to Fees

• Current Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Original Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited)
• Inventors: Yamano, Kenji
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): WALLACE, MICHAEL J
• Application Number:
  US08/401,004
• Time in Patent Office: 1,230 Days
• Field of Search: 310/91, 310/90, 310/67 R, 310/162, 310/261, 310/265, 310/42, 310/44, 310/45, 310/254, 310/89, 310/43, 310/58
• US Class Current: 310/91
• CPC Class Codes: F16C 19/54 Systems consisting of a plurality of bearings with rolling friction spindle bearings F16C35/08
• CPC Class Codes: F16C 35/045 with a radial flange to mount the housing
• CPC Class Codes: H02K 5/04 Casings or enclosures characterised by the shape, form or construction thereof
• CPC Class Codes: H02K 5/08 Insulating casings
• CPC Class Codes: H02K 5/1735 radially supporting the rotary shaft at only one end of the rotor H02K5/1737 takes precedence
• CPC Class Codes: H02K 7/085 radially supporting the rotary shaft at only one end of the rotor H02K7/086, H02K7/09 take precedence
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft
• CPC Class Codes: H02K 9/223 Heat bridges

Abstract

A cylindrical bearing box 2 is integrally provided at the axial center of an annular disk 1 on which a flange 1a is formed. A shaft 3 is attached to a pair of bearings 2a, 2b engaged with the bearing box 2. A rotary disk 4 attached the shaft 3 on a side opposite to the drive side is molded integrally with a conductor 5a of a rotor 5 arranged outside of the bearing box 2 in the radial direction. A stator 6 arranged outside of the rotor 5 through a magnetic clearance is attached to the stationary side of the rotary electric machine. A synthetic resin member 7, the electric insulating property and heat conductivity of which are high, is molded in the overall periphery of the stator 6 including the winding 6a and the iron core 6b. An end face of the synthetic resin member 7 on the drive side is closely contacted with the annular disk and attached by a screw 1b. Blades 4a are provided on an outer end face of the rotary disk 4 and enclosed by a fan cover 4b. A shaft seal device 8 is provided in a gap formed between a small diameter end face portion 7a of the synthetic resin member 7 on a side opposite to the drive side and the rotary disk 4.

Claims

1. A rotary electric machine comprising:

an annular disk;

a flange to which an opponent machine is attached, said flange being formed on an outer end surface of said annular disk;

a pair of bearings;

a shaft engaged with said bearing;

a cylindrical bearing box integrally formed at an axis of said annular disk and engaged with said pair of bearings;

a rotary disk attached to said shaft on a side opposite to said flange, an end of said shaft being projected to the flange side;

a rotor integrally formed on said rotary disk, said rotor being arranged on the outside of said bearing box in the radial direction;

a stator having a winding and iron core and attached to a stationary side of the electric machine, said stator being arranged on the outside of said rotor through a magnetic clearance;

a synthetic resin member having an electrical insulating property and heat conductivity molded on an entire circumference of said stator including said winding and iron core so that said synthetic resin member is in close contact with said annular disk on a side surface of said flange, said synthetic resin member being exposed to air throughout its periphery for cooling; and

a cover enclosing an end surface of the electric machine on the side opposite to the flange, joined to said synthetic resin member, and having a ventilating hole.

2. A rotary electric machine as claimed in claim 1, further comprising fan blades formed on an outer end surface of said rotary disk, a fan cover for enclosing said fan blades with the ventilating hole near the fan blades, and a shaft seal device formed in a clearance between a portion from an end surface small diameter part of said synthetic resin member on a side opposite to said flange to an inner circumferential end surface part and one of said rotary disk and a conductor of said rotor, so that a shaft-sealed type electric machine is provided.

5. A rotary electric machine as claimed in claim 1, wherein said annular disk and said synthetic resin member are integrally molded.

6. A rotary electric machine as claimed in claim 5, wherein said cover and said synthetic resin member are integrally molded.

3. A rotary electric machine comprising:

an annular disk;

a flange to which an opponent machine is attached, said flange being formed on an outer end surface of said annular disk;

a pair of bearings;

a shaft engaged with said bearing;

a cylindrical bearing box integrally formed at an axis of said annular disk and engaged with said pair of bearings;

a rotary disk attached to said shaft on a side opposite to said flange, an end of said shaft being projected to the flange side;

a rotor integrally formed on said rotary disk, said rotor being arranged on the outside of said bearing box in the radial direction;

a stator having a winding and iron core and attached to a stationary side of the electric machine, said stator being arranged on the outside of said rotor through a magnetic clearance; and

a synthetic resin member having an electrical insulating property and heat conductivity molded on an entire circumference of said stator including said winding and iron core so that said synthetic resin member is in close contact with said annular disk on a side surface of said flange, said synthetic resin member being exposed to air throughout its periphery for cooling; and

further comprising a cover enclosing an end surface of the electric machine on the side opposite to the flange and molded integrally with said synthetic resin member, so that a ventilating hole is formed on said cover to provide an open type electric machine.

4. A rotary electric machine comprising:

an annular disk;

a flange to which an opponent machine is attached;

a stator having a winding and iron core;

a synthetic resin member having an electrical insulating property and heat conductivity, molded on an entire circumference of said stator including the winding and iron core, said synthetic resin member being in close contact with said annular disk and on a surface of said flange;

a cover covering an end surface opposite to said flange of the electric machine;

a pair of bearings;

a shaft engaged with said pair of bearings;

a cylindrical bearing box engaging with said pair of bearings, said cylindrical bearing box being arranged at an axis of said cover, said cover and said cylindrical bearing box being molded integrally with said synthetic resin member, said synthetic resin member being exposed to air throughout its periphery for cooling;

a rotary disk attached to said shaft, an end of said shaft projecting from the flange side away from said cover, said rotary disk being arranged at an axial position of said flange with respect to said shaft;

a rotor arranged outside of said bearing box in the radial direction, said rotor being integrated with said rotary disk; and

said stator arranged outside of said rotor through a magnetic clearance, so that an open type electric machine is provided in that said rotary disk is exposed to the atmosphere.