Motor having split spray ring for cooling end turns

Patent metadata

Field	Value
Publication number	US-10468923-B2
Application number	US-201615256240-A
Country	US
Kind code	B2
Filing date	Sep 2, 2016
Priority date	Sep 2, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A motor is cooled with a coolant. The motor includes a rotor rotatable about an axis, a stator including a stator core and windings wound about the stator core, a housing enclosing at least a portion of the stator, and a resiliently deflectable spray ring extending circumferentially relative to the axis. The spray ring defines at least one orifice configured to direct coolant on the stator. The spray ring presents first and second arcuately spaced apart ends defining a gap therebetween.

First claim

What is claimed is:

1. A motor configured to be cooled with a coolant, said motor comprising:
a rotor rotatable about an axis;
a stator including a stator core and windings wound about the stator core;
a housing enclosing at least a portion of the stator;
a resiliently deflectable spray ring extending circumferentially relative to the axis,
said spray ring defining at least one orifice configured to direct coolant on the stator,
said spray ring presenting first and second arcuately spaced apart ends defining a gap therebetween,
said housing including an inner surface defining a recessed channel,
said spray ring overlying and enclosing said channel such that the inner surface and the spray ring cooperatively define a coolant-directing conduit that extends circumferentially around at least substantially half of the circumference of the stator core,
said coolant-directing conduit configured to direct coolant to the at least one orifice; and
a ring deflector operable to selectively deflect the spray ring and thereby expand or contract the gap,
said ring deflector comprising a wedge fitted in the gap,
said wedge being adjustably positionable in a generally radial direction,
said wedge including a pair of tapered faces engaging corresponding ones of the ends of the spray ring, such that generally radial shifting of the wedge deflects the spray ring and results in corresponding expansion or contraction of the gap.

2. The motor as claimed in claim 1 ,
said ring deflector further comprising a threaded fastener that extends generally radially,
said fastener threadably engaging the wedge, with rotation of the fastener resulting in the generally radial shifting of the wedge.

3. The motor as claimed in claim 1 ,
said ring deflector further comprising an adjustable fastener coupled to the wedge, with adjustment of the fastener resulting in shifting of the wedge and thereby deflection of the spray ring.

4. The motor as claimed in claim 1 ,
said stator core presenting an outer circumferential surface; and
a stator-cooling passage extending along the outer surface of the core, with the passage being configured to receive coolant flow so as to remove heat from the stator core during operation of the motor,
said conduit extending between and fluidly interconnecting the stator-cooling passage and the at least one orifice.

5. The motor as claimed in claim 4 ,
said inner surface of the housing cooperating with the outer surface of the stator core to define the stator-cooling passage.

6. The motor as claimed in claim 5 ,
said housing defining an inlet fluidly interconnected with the stator-cooling passage,
said stator-cooling passage extending in opposite circumferential directions from the inlet.

7. The motor as claimed in claim 1 ,
said stator core including opposite first and second ends spaced along the axis,
said windings including end turns positioned adjacent the first end of the stator core,
said spray ring configured to direct coolant onto the end turns.

8. The motor as claimed in claim 7 ,
said at least one orifice configured to direct coolant generally radially onto the end turns.

9. The motor as claimed in claim 8 ,
said spray ring at least substantially circumscribing the end turns,
said at least one orifice configured to direct coolant generally radially inwardly onto the end turns.

10. The motor as claimed in claim 7 ,
said windings including additional end turns positioned at the second end of the stator core; and
a second resiliently deflectable spray ring extending circumferentially relative to the axis and defining at least one second orifice configured to direct coolant on the additional end turns,
said second spray ring presenting first and second arcuately spaced apart second ends defining a second gap therebetween.

11. The motor as claimed in claim 1 ,
said spray ring defining a plurality of said orifices,
said orifices being arcuately spaced apart.

12. The motor as claimed in claim 11 ,
adjacent ones of said orifices defining an orifice spacing therebetween,
said orifice spacing progressively decreasing for at least some of said adjacent ones of the orifices in a direction moving away from the ends.

13. The motor as claimed in claim 11 ,
at least some of said orifices being variably configured so as to optimize direction of coolant on the stator.

14. The motor as claimed in claim 1 ,
said motor further including a bearing assembly configured to be lubricated by coolant deflected from the stator.

15. A motor configured to be cooled with a coolant, said motor comprising:
a rotor rotatable about an axis;
a stator including a stator core and windings wound about the stator core;
a housing enclosing at least a portion of the stator;
a resiliently deflectable spray ring extending circumferentially relative to the axis,
said spray ring defining at least one orifice configured to direct coolant on the stator,
said spray ring presenting first and second arcuately spaced apart ends defining a gap therebetween; and
a ring deflector operable to selectively deflect the spray ring and thereby expand or contract the gap,
said ring deflector comprising a wedge fitted in the gap,
said ring deflector further comprising a threaded fastener that extends generally radially,
said wedge including a pair of tapered faces engaging corresponding ones of the ends of the spray ring, such that generally radial shifting of the wedge deflects the spray ring and results in corresponding expansion or contraction of the gap,
said fastener threadably engaging the wedge, with rotation of the fastener resulting in the generally radial shifting of the wedge.

16. The motor as claimed in claim 15 , further comprising:
a coolant-directing conduit configured to direct coolant to the at least one orifice,
said spray ring at least in part defining the conduit.

17. The motor as claimed in claim 16 ,
said housing including an inner surface defining a recessed channel,
said spray ring overlying said channel such that the inner surface and the spray ring cooperatively define the conduit.

Assignees

• Nidec Motor Corp

Inventors

• Heilman Raymond D
• Poag Andrew F
• Snider S Duke
• Scoble Iii John T
• Kirkley Jr Thomas E

Classifications

• H02K5/1732

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title

• H02K2213/09

  Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators · CPC title

• H02K1/20 Primary

  with channels or ducts for flow of cooling medium · CPC title

• H02K5/20

  with channels or ducts for flow of cooling medium · CPC title

• H02K5/203

  specially adapted for liquids, e.g. cooling jackets · CPC title