Wind power generator with internal cooling circuit

• US 9,287,747 B2
• Filed: 10/25/2010
• Issued: 03/15/2016
• Est. Priority Date: 11/02/2009
• Status: Active Grant

• Current Assignee: Flender GmbH (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Balzer, Christoph, Brach, Karsten, Meyer, Christian, Mhle, Axel, Schlawitz, Andre, Seibicke, Frank
• Primary Examiner(s): DESAI, NAISHADH N
• Application Number:
  US13/505,377
• Publication Number:
  US 20120217756A1
• Time in Patent Office: 1,968 Days
• Field of Search: 310 57- 59, 310/60.A, 310/61, 310/64, 290/44, 290/55
• US Class Current: 1/1
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 5/207 with openings in the casing specially adapted for ambient air
• CPC Class Codes: H02K 7/1838 Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine
• CPC Class Codes: H02K 9/10 by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction

Abstract

A wind power generator with a closed internal cooling circuit has a stator that is implemented as sheet metal and includes a winding system which forms winding heads at the end faces of the stator. The stator is enclosed by a cooling jacket at least in the region of the laminated core, wherein permanent magnets of a rotor are disposed on a magnet wheel jacket embodied as a hollow shaft. The magnet wheel jacket is connected in a rotationally fixed manner to a shaft or shaft stubs by way of support elements at its end faces, wherein in its interior the hollow shaft has at least one tube whose lateral surface area runs at an equidistant clearance from the magnet wheel jacket. Blowers are mounted at the end faces of the rotor.

Claims

1. A wind power generator with a closed internal cooling circuit, said wind power generator comprising:

a stator having a laminated core and a winding system which forms winding heads at end faces of the stator;

a cooling jacket enclosing the stator at least in a region of the laminated core;

a rotor having a magnet wheel jacket which is embodied as a hollow shaft, and permanent magnets which are disposed on the magnet wheel jacket;

a support assembly for connecting the magnet wheel jacket at end faces thereof in a rotationally fixed manner to a shaft or shaft stub of a wind power plant;

a first tube arranged in an interior of the hollow shaft which is the magnet wheel jacket of the rotor, and having a lateral surface area extending at an equidistant clearance from the magnet wheel jacket; and

blowers provided with blower vanes and respectively mounted at end faces of the rotor and attached to opposite ends of the first tube arranged in the interior of the hollow shaft which is the magnet wheel jacket of the rotor.

2. The wind power generator of claim 1, wherein the tube is arranged inside the hollow shaft in such a way as to establish cooling ducts inside the hollow shaft as part of the closed internal cooling circuit, thereby permitting a cooling air flow in opposite flow directions inside the hollow shaft.

3. The wind power generator of claim 1, wherein the blower vanes are attached to a support plate configured to simultaneously provide an air conducting function.

4. The wind power generator of claim 1, further comprising a second tube arranged inside the hollow shaft to stiffen the rotor and/or define cooling ducts forming another part of the closed internal cooling circuit.

5. The wind power generator of claim 1, further comprising a heat exchanger arranged on one side of the wind power generator and recooling a gaseous medium of the closed internal cooling circuit in the interior of the hollow shaft.

6. The wind power generator of claim 5, further comprising a housing supported on the shaft or shaft stub, said heat exchanger being removably connected to the housing.