Electrical machine with air-cooled control chip

• US 20030173847A1
• Filed: 03/04/2003
• Published: 09/18/2003
• Est. Priority Date: 03/02/2001
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Hillmer, Frank, Doeffinger, Andreas, Henkel, Achim, Bilsing, Thomas
• Granted Patent: US 6,897,583 B2
• Time in Patent Office: Days
• US Class Current: 310/102R
• CPC Class Codes: H02K 19/36 Structural association of synchronous generators with auxiliary electric devices influencing the characteristic of the generator or controlling the generator, e.g. with impedances or switches
• CPC Class Codes: H02K 19/365 with a voltage regulator
• CPC Class Codes: H02K 5/141 for cooperation with slip-rings
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft
• CPC Class Codes: H02K 9/28 Cooling of commutators, slip-rings or brushes e.g. by ventilating

Abstract

In an electrical machine, in particular a generator for a motor vehicle, having a housing (2), a rotor (6), supported rotatably in the housing (2) about a pivot axis (5), at least one fan wheel (20), connected to the rotor (6), for generating a cooling air flow (22, 22′, 22″) from at least one intake opening (37; 37′; 37″) disposed in the housing (2) to at least one outlet opening (24) disposed in the housing (2), and at least one regulator chip (31), disposed on a chip holder (30), for regulating the current generation, it is provided that the chip holder (30) is disposed such that it is bathed at least in part directly by the cooling air flow (22, 22′, 22″). As a result of this arrangement, it is attained that a very high heat transfer coefficient is present, because of the high flow speed of the cooling air flow (22, 22′, 22″).

Claims

1. An electrical machine, in particular a generator for a motor vehicle, having

a) a housing (2),

b) a rotor (6), supported rotatably in the housing (2) about a pivot axis (5),

c) at least one fan (20), connected to the rotor (6), for generating a cooling air flow (22, 22′

, 22″

) from at least one intake opening (37;

37′

;

37″

) disposed in the housing (2) to at least one outlet opening (24) disposed in the housing (2), and

d) at least one regulator chip (31), disposed on a chip holder (30), for regulating the current generation, characterized in that

e) the chip holder (30) is disposed such that it is bathed at least in part directly by the cooling air flow (22, 22′

, 22″

);

2. The electrical machine of claim 1, characterized in that the chip holder (30) is received in a recess (26) in the housing (2).

3. The electrical machine of claim 2, characterized in that the chip holder (30) is insulated from the housing (2).

4. The electrical machine of one of the foregoing claims, characterized in that at least one intake opening (37′

;

37″

) is disposed immediately adjacent the chip holder (30).

5. The electrical machine of one of the foregoing claims, characterized in that the chip holder (30) is a leadframe or a bus.

6. The electrical machine of claim 1, characterized in that the chip holder (30) is disposed outside the housing (2).

7. The electrical machine of claim 6, characterized in that the chip holder (30) is disposed in front of an intake opening (37′

) disposed in the housing (2).

8. The electrical machine of claim 6 or 7, characterized in that the chip holder (30) is secured in spaced-apart fashion relative to the housing (2) by means of spacers (38).

9. The electrical machine of one of the foregoing claims, characterized in that the chip holder (30) is disposed at a point where the speed of the cooling air flow (22, 22′

, 22″

) is especially high.

10. The electrical machine of one of the foregoing claims, characterized in that the chip holder (30) comprises a highly heat-conductive material.