ELECTRIC MOTOR HAVING SUPPORT SURFACES FOR MAINTENANCE

• US 20140265737A1
• Filed: 06/02/2014
• Published: 09/18/2014
• Est. Priority Date: 02/19/2010
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Yagi, Nobuyuki, Murkakami, Satoru
• Granted Patent: US 8,922,075 B2
• Time in Patent Office: Days
• US Class Current: 310/425
• CPC Class Codes: F16C 19/26 with a single row of rollers
• CPC Class Codes: F16C 2380/26 Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
• CPC Class Codes: F16C 33/6622 Details of supply and/or removal of the grease, e.g. purging grease
• CPC Class Codes: F16C 35/04 in the case of ball or roller bearings
• CPC Class Codes: F16C 35/077 between housing and outer race ring
• CPC Class Codes: H02K 15/0006 Disassembling, repairing or modifying dynamo-electric machines repairing of cooling fluid boxes H02K15/0093
• CPC Class Codes: H02K 15/14 Casings; Enclosures; Supports
• CPC Class Codes: H02K 15/16 Centering rotors within the stator; Balancing rotors
• CPC Class Codes: H02K 5/16 Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields magnetic bearings H02K7/09
• CPC Class Codes: H02K 5/1732 radially supporting the rotary shaft at both ends of the rotor H02K5/1737 takes precedence
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft

Abstract

According to one embodiment, an electric motor includes a stator, a rotor, bearings and a rotor shaft, in a frame, supporting surfaces on the rotor, and a plurality of threaded holes in the frame, which are configured to receive bolts for pressing the support surfaces from outside.

Claims

1. An electric motor comprising:

a stator;

a frame supporting the stator;

a bracket and an end plate configured to close respective ends of the frame;

a first bearing housing and a second bearing housing respectively retaining bearings, and respectively fixed to the bracket and the end plate from an outside;

a rotor shaft arranged inside the frame and rotatably supported by the bearings;

a rotor attached to the rotor shaft and opposing the stator;

a first supporting body and a second body attached to the rotor shaft at respective sides of the rotor and respectively including tapered supporting surfaces; and

a plurality of threaded for fixing formed respectively in the bracket and the end plate to oppose the supporting surfaces, and into which a supporting member for fixing the rotor that presses the tapered supporting surfaces are configured to be insertable from outside,

wherein the plurality of threaded holes are formed in a manner penetrating in a direction substantially perpendicular to the tapered supporting surface and extends into the frame towards the tapered supporting surface, and

the supporting member is inserted in the plurality of threaded holes for fixing and presses each of the tapered supporting surfaces.

2. An electric motor according to claim 1, wherein the rotor comprises a rotor core attached to the rotor shaft, and core holders attached to the rotor shaft at respective sides of the rotor core and respectively including the supporting surfaces.

7. The electric motor according to claim 2, wherein the supporting surfaces of the core holders comprise tapered surfaces positioned at least at parts on a circumference having the rotor shaft as a center, and the plurality of threaded holes are formed in the bracket and the end plate so as to align on circumferences having the rotor shaft as centers.

3-6. -6. (canceled)

8-16. -16. (canceled)