Electrical machine

• US 6,087,744 A
• Filed: 08/11/1998
• Issued: 07/11/2000
• Est. Priority Date: 08/26/1997
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Glauning, Juergen
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Waks, Joseph
• Application Number:
  US09/131,830
• Time in Patent Office: 700 Days
• Field of Search: 310/52, 310/58, 310/54, 310/89, 310/61
• US Class Current: 310/58
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 5/203 specially adapted for liquids, e.g. cooling jackets
• CPC Class Codes: H02K 5/207 with openings in the casing specially adapted for ambient air
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft

Abstract

An electrical machine for starting an internal combustion engine and/or for voltage supply of a vehicle electrical system of a motor vehicle has a housing, a stator mounted on the housing, a claw pole rotor system, a separable operative connection with an internal combustion engine, and separate circulations with different cooling media for the stator and the rotor.

Claims

1. An electrical machine for starting an internal combustion engine and/or for voltage supply of a vehicle electrical system of a motor vehicle, comprising a housing;

a stator mounted on said housing;

a claw pole rotor systems, a separable operative connection for connecting the machine with an internal combustion engine; and

means for providing separate circulations with different cooling media for said stator and said rotor, said means including an opening provided in said rotor centrally and closed by a positive guiding element so as to guide a circulating air.

2. An electrical machine as defined in claim 1, wherein said positive guiding element is formed as a closing plug with a conical tip located on said rotary axis of a rotor.

3. An electrical machine as defined in claim 2;

and further comprising a further positive guiding element formed as an impulse wheel with a plurality of vanes.

4. An electrical machine as defined in claim 3, wherein said further positive guiding element has a rotatable air guiding plate.

5. An electrical machine for starting an internal combustion engine and/or for voltage supply of a vehicle electrical system of a motor vehicle, comprising a housing;

a stator mounted on said housing;

a claw pole rotor systems, a separable operative connection for connecting the machine with an internal combustion engine; and

means for providing separate circulations with different cooling media for said stator and said rotor, said means forming a closed air circulation.

6. An electrical machine for starting an internal combustion engine and/or for voltage supply of a vehicle electrical system of a motor vehicle, comprising a housing;

a stator mounted on said housing;

a claw pole rotor;

a separable operative connection for connecting the machine with an internal combustion engine; and

means for providing separate circulations with different cooling media for said stator and said rotor, said means including an air cooling of said rotor by an air circulation, said air cooling of said rotor being provided by a central air guide and a plurality of radial transverse openings formed in said rotor, said rotor having a shaft, said central air guide being formed as a single central opening extending from one end of said shaft.