US20120104879A1 - Noise reduction structures for electrical machines - Google Patents

Noise reduction structures for electrical machines Download PDF

Info

Publication number
US20120104879A1
US20120104879A1 US13/285,150 US201113285150A US2012104879A1 US 20120104879 A1 US20120104879 A1 US 20120104879A1 US 201113285150 A US201113285150 A US 201113285150A US 2012104879 A1 US2012104879 A1 US 2012104879A1
Authority
US
United States
Prior art keywords
rotor
poles
laminations
component
rotationally
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/285,150
Other languages
English (en)
Inventor
Krishnan Ramu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Regal Beloit America Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US13/285,150 priority Critical patent/US20120104879A1/en
Assigned to RAMU, INC. reassignment RAMU, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAMU, KRISHNAN
Publication of US20120104879A1 publication Critical patent/US20120104879A1/en
Assigned to RBC MANUFACTURING CORPORATION reassignment RBC MANUFACTURING CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAMU, INC.
Assigned to REGAL BELOIT AMERICA, INC. reassignment REGAL BELOIT AMERICA, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RBC MANUFACTURING CORPORATION
Abandoned legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • Switched reluctance machines have made limited entry into commercial applications.
  • a major problem limiting the desirability of using SRMs in commercial applications is the acoustic noise they generate. This acoustic noise is attributed to: (1) high normal forces caused by various imbalances in the non-uniform air gap between an SRM's rotor and stator, (2) discontinuous currents in the SRM's machine windings causing discontinuous torque that produces very high torque pulsations, and (3) the rotor functioning like an impeller.
  • Many emerging applications, such as commercial refrigeration motor drives require quiet operation with less noise than that of a very good single-speed induction motor. In the case of variable-speed motor drives, the noise of an SRM drive should be comparable to that of a permanent magnet brushless de motor drive. SRMs have not satisfactorily met the noise requirement to satisfy commercial applications.
  • the invention disclosed herein provides solutions to the high-noise generation of a switched reluctance machine (SRM) that can be implemented for high-volume applications.
  • SRM switched reluctance machine
  • High-volume applications require inexpensive machine designs that are simple to implement.
  • An invention is described in this application with three preferred embodiments for mitigating the acoustic noise of an SRM. Normal forces, imbalance in the air gap, saturation in laminations, and torque ripple all contribute to acoustic noise. The acoustic noise is further exacerbated by electronic switching of current in the SRM's winding.
  • An object of the invention is to reduce the fluid flow and air gap imbalance by: (1) encapsulating a machine's rotor/stator slots, (2) rotating a machine's stacked rotor laminations, and (3) providing discs on both ends of a machine's rotor/stator stack.
  • an electrical machine component having: (1) a plurality of salient poles, projecting along a radial axis of the component, that each conveys an applied electromagnetic flux; and (2) an electrically and magnetically inert solid material within a space between a rotationally-adjacent pair of salient poles.
  • a machine rotor having: (1) a plurality of salient poles, projecting along a radial axis of the rotor, that each conveys an applied electromagnetic flux; (2) a space between a rotationally-adjacent pair of salient poles that inhibits conveyance of an applied electromagnetic flux; and (3) first and second opposing structures that each extends at least partially across the rotationally-adjacent pair of poles and has an outward salient projection along the radial axis of the rotor.
  • an electrical machine having: (1) an electrical component having a plurality of salient poles, projecting along a radial axis of the component, that each conveys an applied electromagnetic flux; and (2) an annulus disposed outside a first axial surface of the electrical component.
  • the annulus is a barrier between a space outside the axial surface of the electrical component and a space between a rotationally-adjacent pair of poles.
  • FIGS. 1( a ) and 1 ( b ) illustrate a rotor stack assembly having a plurality of laminations
  • FIGS. 2( a ) and 2 ( b ) illustrate a rotor having its slots filled with a material
  • FIG. 3 illustrates a stator having its slots filled with a material
  • FIGS. 4( a ) and 4 ( b ) illustrate a rotor lamination stack in which a lamination at each end of the stack is phase-rotated with respect to the laminations sandwiched between the two end laminations;
  • FIG. 5( a ) illustrates a rotor lamination stack having phase-shifted end laminations that do not entirely cover the longitudinal sides of rotor slots;
  • FIG. 5( b ) illustrates a rotor lamination stack in which multiple phase-shifted end laminations cover the longitudinal sides of rotor slots
  • FIGS. 6( a ) and 6 ( b ) illustrate an annulus that blocks the air flow along the axial path of a rotor lamination stack
  • FIG. 7( b ) illustrates an annulus that is disposed at one axial end of a stator so as to cover the open space between each rotationally-adjacent pair of poles.
  • FIGS. 1( a ) and 1 ( b ) illustrate a rotor lamination stack 1 having a plurality of laminations.
  • Individual rotor laminations 2 ( 1 )- 2 ( x ) are stacked together such that their pole faces 11 and slots 12 line up along an axial direction of rotor lamination stack 1 .
  • Rotor laminations 2 ( 1 )- 2 ( x ) are stacked one on top of the other to a length known as a stack length, which determines the torque and power output of a machine comprising rotor lamination stack 1 and a stator (not shown).
  • the stator may be any type of switched reluctance machine (SRM), such as those described by Ramu, Krishnan, “Switched reluctance motor drives”, CRC Press, 2001, which is incorporated herein in its entirety by reference.
  • SRM switched reluctance machine
  • the vortex noise component has a very low frequency compared to the tonal-component frequency and is not a major cause for concern in an SRM.
  • the tonal-frequency noise component has exactly the same value as the combined phase frequencies in the SRM.
  • the fan-blade noise component directly adds to the noise component due to normal forces, created by the alignment of the stator and rotor poles, since their frequencies are the same.
  • the noise at this common frequency (i.e., the phase frequency) and its higher-order harmonics, which are integral multiples of this frequency, are the most troubling noise components in the SRM.
  • An SRM rotor because of its sizeable slot dimensions compared to the pole face dimensions (e.g., as much as 100 to 125% of the pole face area), provides a large flow surface and area for air circulation as the rotor rotates, creating an aerodynamic effect on the SRM.
  • the aerodynamic effect will be reduced by blocking the airflow path.
  • Such airflow blocking may be achieved by covering the slot volume with a material.
  • the covering material is magnetically and electrically inert so that: (1) the flux distribution of the rotor and stator structures is not distorted from the intended design and (2) the material does not create magnetic or electric losses.
  • the material (1) is sufficiently adhesive to hold on to rotor laminations 2 ( 1 )- 2 ( x ), (2) has sufficient thermal tolerance to withstand the peak temperature of the rotor, and (3) is inexpensive for high-volume product applications.
  • Such material may be an encapsulation epoxy, resin, or powder.
  • rotor lamination stack 1 is placed in a cup having an inner nonstick surface and a height that is flush with rotor lamination stack 1 .
  • the cup has a circular surface and its bottom is a disc that can be secured tightly and subsequently removed.
  • the cylindrical periphery of the cup has flexible parts that can be tightened around rotor lamination stack 1 with a latch-like mechanism.
  • material 22 is cured within rotor lamination stack the stack can be removed by removing the bottom disc from the filling assembly fixture and unlatching the cylindrical part of the cup body.
  • the rotor shaft hole within rotor lamination stack 1 may be masked to prevent poured material 22 from entering.
  • the cup can be made with a protrusion at the center to correspond to the shaft hole of rotor lamination stack 1 , so that the placement of rotor lamination stack 1 on the protrusion closes the shaft hole of rotor lamination stack 1 .
  • rotor lamination stack 1 is first press fitted to a rotor shaft, placed in a cup surrounding rotor lamination stack 1 to the height of the stack, and then the encapsulating material is poured into the cup. After material 22 is poured or otherwise applied, rotor lamination stack 1 may be cured in a temperature-controlled oven or naturally, by exposing it to air, so that material 22 bonds with rotor lamination stack 1 . The bonding is intended to provide good adhesion and mechanical strength for withstanding forces normally encountered in the rotor body.
  • Curing material 22 in a temperature-controlled oven is quicker and may be accomplished in a few minutes. Curing at ambient temperature may take hours. The appropriate method of curing for a particular application may be chosen based on economic considerations.
  • Rotor laminations 2 ( 1 )- 2 ( x ) may be stacked in any manner, such as: (1) symmetrically, with one lamination on top of another so as to provide uniform slots and pole surfaces having no phase shift among them, (2) skewed so as to have a phase shift among laminations, (3) partially skewed, or (4) partial uniform stacking.
  • the above-described technique of encapsulating space within the slots of a rotor lamination stack may be applied to the slots of a stator or a stator lamination stack. Applying this technique to the stator slots prevents air flow generated by the rotation of the rotor from entering the interstice space, which would create additional friction and noise.
  • FIG. 3 illustrates a stator having its slots filled with a material.
  • a stator 30 with a plurality of poles 32 and a winding 34 around each pole has a filling material 22 of epoxy.
  • Filling material 22 partially or entirely fills stator slots 36 and is contoured to be flush with the stator lamination stack end-surfaces and pole faces.
  • Encapsulation with epoxy or another material creates added cost due to the encapsulation material, process, and curing and the fixtures for creating the encapsulation. Particularly for 100 Watt and higher machines, the cost becomes significant, which is undesirable for high-volume applications that are cost-sensitive. Alternatives to encapsulation are described below.
  • FIGS. 4( a ) and 4 ( b ) illustrate a second embodiment of a rotor lamination stack 40 in which a lamination at each end of the stack is phase-rotated with respect to the laminations sandwiched between the two end laminations. More specifically, a rotor lamination 42 ( 1 ) disposed at one longitudinal end of rotor lamination stack 40 is rotated, about a rotational axis of rotor lamination stack 40 , so as to be out of phase with rotor laminations 42 ( 2 )- 42 ( x ⁇ 1).
  • a pole 11 of rotor lamination 42 ( 1 ) partially or fully covers a slot 12 of rotor laminations 42 ( 2 )- 42 ( x ⁇ 1). And each slot 12 of rotor laminations 42 ( 2 )- 42 ( x ⁇ 1) is so covered by a pole 11 of rotor lamination 42 ( 1 ).
  • a pole 11 of a rotor lamination 42 ( x ) on the opposite side of rotor lamination stack 40 partially or fully covers a slot 12 of rotor laminations 42 ( 2 )- 42 ( x ⁇ 1) such that each slot 12 of rotor laminations 42 ( 2 )- 42 ( x ⁇ 1) is so covered by a pole 11 of rotor lamination 42 ( x ).
  • the offset rotor laminations 42 ( 1 ) and 42 ( x ) and stator pole periphery create a barrier inhibiting the flow of air into and out of slots 12 .
  • two or three laminations may be phase rotated at each end of rotor lamination stack 40 .
  • An advantage of this embodiment is that no special materials or discs have to be made and the use of the rotor laminations to inhibit the flow of air is inexpensive. Additionally, the production process is simple and may be automated to phase shift the end laminations by half a rotor pole pitch from the rest of the lamination stack. Overall, the process for producing this embodiment is easy and inexpensive to implement and the detrimental effects on the performance of the machine are negligible. Experimental results confirm that this embodiment reduces acoustic noise of the machine to an extent equal to that achieved with the first embodiment.
  • rotor laminations 42 ( 1 ) and 42 ( x ) can be phase rotated to cover an entire slot, as seen from the perspective of a plan view (i.e., as seen along the axis of rotation).
  • a partial covering of slots 12 may be achieved.
  • FIG. 5( a ) illustrates phase-shifted end laminations that do not entirely cover the longitudinal sides of slots 12 . More specifically, end laminations 51 and 52 are phase shifted in opposite directions with respect to intermediary laminations 50 . As illustrated, no unhindered path exists through a slot 12 along an axis parallel to the axis of rotation. However, end laminations 51 and 52 could be phase rotated in a single direction or opposite directions so as to provide an unhindered path through a slot 12 along an axis parallel to the axis of rotation.
  • FIG. 5( b ) illustrates the use of multiple phase-shifted end laminations for covering the longitudinal sides of slots 12 at one longitudinal end of a rotor lamination stack 54 .
  • a first rotor lamination 55 is phase shifted with respect to intermediary rotor laminations 50 and a second rotor lamination 56 is phase shifted with respect to both first rotor lamination 55 and intermediary rotor laminations 50 .
  • first and second rotor laminations 55 and 56 cover all of slots 12 along a longitudinal side of rotor lamination stack 54 .
  • a pair of laminations 57 and 58 are phase rotated with respect to one another and intermediary rotor laminations 50 so as to cover all of slots 12 along the opposite longitudinal side of rotor lamination stack 54 .
  • FIG. 5( b ) illustrates that two laminations are phase shifted at each end of rotor lamination stack 54
  • more than two laminations may be offset with respect to one another and intermediary rotor laminations 50 so as to cover slots 12 along each longitudinal side of rotor lamination stack 54 . Covering the entire portion of slots 12 along each longitudinal side provides greater acoustic noise reduction than covering only a portion of slots 12 along each longitudinal side.
  • Rotor laminations 50 may be stacked in any manner, such as: (1) symmetrically, with one lamination on top of another so as to provide uniform slots and pole surfaces having no phase shift among them, (2) skewed so as to have a phase shift among laminations, (3) partially skewed, or (4) partial uniform stacking.
  • Rotor laminations 51 , 52 , 55 - 58 may be identical to intermediary laminations 50 , to reduce manufacturing cost, or may have different pole and slot arcs that one another and intermediary laminations 50 .
  • the first and second embodiments may be combined so that slots 12 of intermediary laminations 50 are partially or entirely filled with an encapsulating material and bounded by laminations on all sides except an outer radial periphery.
  • FIGS. 6( a ) and 6 ( b ) illustrate the use of an annuluses to block air flow along the axial path of a rotor lamination stack 61 .
  • Each annulus 62 may be as thick as a rotor lamination but made of lighter and stronger material.
  • An annulus 62 may be placed on each end of rotor lamination stack 61 .
  • the annulus material is preferably both electrically and magnetically inert, capable of withstanding the thermal environment of the rotor without any deterioration, and strong enough to withstand the forces surrounding the rotor lamination block.
  • each annulus 62 has the same outer diameter as rotor lamination stack 61 or is equal to the minimum diameter of a contoured rotor tooth, so as to have a higher dimensional tolerance.
  • annulus 62 Thin plastic rings and fiber board used in a printed circuit board base are suitable materials for annulus 62 .
  • An advantage of using annulus 62 is that it is easier, in a production environment, to add the annulus than to employ phase-shifted laminations. Also, annuluses are less expensive, lighter in weight, and provide a uniform surface, similar to encapsulation, that is flush with the axial ends of the lamination stack; with phase-shifted laminations, an unevenness of the axial-end surface exists between the slots and poles of the end laminations.
  • FIGS. 7( a ) and 7 ( b ) illustrate the use of an annulus to block the air flow path along the axial path of a stator lamination stack.
  • FIG. 7( a ) illustrates a stator 70 with a plurality of poles 72 and a winding 74 around each pole.
  • FIG. 7( b ) illustrates, via a plan view, an annulus 76 that is disposed at one axial end of stator 70 so as to cover the open space between each rotationally-adjacent pair of poles 72 without interfering with the rotation of a rotor (not shown) within stator 70 .
  • Another annulus (not shown) may be disposed on the opposite axial end of stator 70 in a similar manner.
  • All three of the above-described embodiments are applicable to any type of electrical machine, including induction motors, permanent magnet synchronous motors, brushless dc motors, and switched reluctance motors.
  • the above-described embodiments may be applied individually or in combination to an electrical machine and to electrical machines having radial or axial field orientations for rotating or linear types of configurations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Dc-Dc Converters (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Ac Motors In General (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Motor Or Generator Frames (AREA)
US13/285,150 2010-11-03 2011-10-31 Noise reduction structures for electrical machines Abandoned US20120104879A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/285,150 US20120104879A1 (en) 2010-11-03 2011-10-31 Noise reduction structures for electrical machines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40963810P 2010-11-03 2010-11-03
US13/285,150 US20120104879A1 (en) 2010-11-03 2011-10-31 Noise reduction structures for electrical machines

Publications (1)

Publication Number Publication Date
US20120104879A1 true US20120104879A1 (en) 2012-05-03

Family

ID=45995906

Family Applications (7)

Application Number Title Priority Date Filing Date
US13/285,176 Expired - Fee Related US8952591B2 (en) 2010-11-03 2011-10-31 Rotor lamination shaping for minimum core loss in SRMs
US13/285,196 Active 2033-03-11 US9312733B2 (en) 2010-11-03 2011-10-31 High power density SRM
US13/285,150 Abandoned US20120104879A1 (en) 2010-11-03 2011-10-31 Noise reduction structures for electrical machines
US13/287,234 Expired - Fee Related US8716961B2 (en) 2010-11-03 2011-11-02 Switched reluctance and PM brushless DC motor drive control for electric vehicle application
US13/287,207 Expired - Fee Related US9054567B2 (en) 2010-11-03 2011-11-02 High power density SRMs
US13/287,221 Expired - Fee Related US8754605B2 (en) 2010-11-03 2011-11-02 Power factor correction circuits for switched reluctance machines
US14/593,775 Abandoned US20150124267A1 (en) 2010-11-03 2015-01-09 Rotor lamination shaping for minimum core loss in srms

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US13/285,176 Expired - Fee Related US8952591B2 (en) 2010-11-03 2011-10-31 Rotor lamination shaping for minimum core loss in SRMs
US13/285,196 Active 2033-03-11 US9312733B2 (en) 2010-11-03 2011-10-31 High power density SRM

Family Applications After (4)

Application Number Title Priority Date Filing Date
US13/287,234 Expired - Fee Related US8716961B2 (en) 2010-11-03 2011-11-02 Switched reluctance and PM brushless DC motor drive control for electric vehicle application
US13/287,207 Expired - Fee Related US9054567B2 (en) 2010-11-03 2011-11-02 High power density SRMs
US13/287,221 Expired - Fee Related US8754605B2 (en) 2010-11-03 2011-11-02 Power factor correction circuits for switched reluctance machines
US14/593,775 Abandoned US20150124267A1 (en) 2010-11-03 2015-01-09 Rotor lamination shaping for minimum core loss in srms

Country Status (4)

Country Link
US (7) US8952591B2 (fr)
EP (1) EP2636141A1 (fr)
CN (1) CN103190069A (fr)
WO (5) WO2012061270A2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110260672A1 (en) * 2010-04-26 2011-10-27 Krishnan Ramu High power density switched reluctance machines with hybrid excitation
WO2015038125A1 (fr) * 2013-09-12 2015-03-19 Nissan Motor Co., Ltd. Rotor destiné à une machine à magnétisation variable
US9136736B2 (en) 2012-06-06 2015-09-15 Nidec Motor Corporation Motor having spoked outer rotor with spaced apart pole segments
CN105958685A (zh) * 2016-06-14 2016-09-21 广东明阳龙源电力电子有限公司 一种新型开关磁阻电机转子塑封机构
WO2017101033A1 (fr) * 2015-12-15 2017-06-22 郑州吉田专利运营有限公司 Moteur à réluctance commutée
US20190238023A1 (en) * 2018-01-30 2019-08-01 Honda Motor Co., Ltd. Rotor of rotating electrical machine
CN113489203A (zh) * 2021-07-01 2021-10-08 南京航空航天大学 一种四相电励磁双凸极电机

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8527126B2 (en) * 2008-10-31 2013-09-03 Toyota Jidosha Kabushiki Kaisha Power supply system for electrically powered vehicle and method for controlling the same
US8793041B2 (en) * 2008-10-31 2014-07-29 Toyota Jidosha Kabushiki Kaisha Electric powered vehicle and control method for the same
FR2944391B1 (fr) * 2008-11-18 2013-03-22 Valeo Sys Controle Moteur Sas Procede et dispositif electrique combine d'alimentation et de charge a moyens de compensation
FR2956261B1 (fr) * 2010-02-05 2012-03-09 Commissariat Energie Atomique Systeme d'equilibrage pour batteries d'accumulateurs
US8952591B2 (en) 2010-11-03 2015-02-10 Regal Beloit America, Inc. Rotor lamination shaping for minimum core loss in SRMs
EP2642653A1 (fr) * 2012-03-20 2013-09-25 C. & E. Fein GmbH Circuit d'excitation et procédé de commande
CN202634338U (zh) * 2012-04-11 2012-12-26 昆山广兴电子有限公司 具断电煞车功能的马达电路
TW201406038A (zh) * 2012-07-24 2014-02-01 Hon Hai Prec Ind Co Ltd 整流電路
US8994244B2 (en) * 2012-08-01 2015-03-31 Nidec Motor Corporation Motor stator with reduced coil configuration
US20140084816A1 (en) * 2012-09-25 2014-03-27 Krishnan Ramu Power converter for an electrical machine and method of operating the machine
JP2014068495A (ja) * 2012-09-27 2014-04-17 Hitachi Automotive Systems Ltd 回転電機およびそれを用いた電動パワーステアリング装置
US9106176B2 (en) 2012-12-30 2015-08-11 Silicon Laboratories Inc. Apparatus for motor control system and associated methods
US9667182B2 (en) * 2013-04-05 2017-05-30 Minėbea Co., Ltd. Method for controlling a brushless electric motor
CN103414337A (zh) * 2013-08-23 2013-11-27 中国矿业大学 一种电动车开关磁阻电机功率变换器拓扑结构
DE102013109264A1 (de) * 2013-08-27 2015-03-05 Magna Powertrain Bad Homburg GmbH Bürstenloser Elektromotor mit einem Außenläufer
CN103441713B (zh) * 2013-09-04 2015-07-08 东南大学 一种调节开关磁阻电机开通角和关断角的方法
KR20150068632A (ko) * 2013-12-12 2015-06-22 삼성전자주식회사 전동기
US20160336793A1 (en) * 2014-05-18 2016-11-17 Black & Decker Inc. On-Board Battery Charging and Regenerative Braking
CN104753414A (zh) * 2015-03-20 2015-07-01 南京航空航天大学 一种Buck电路无刷直流电机驱动系统及其控制方法
ES2815574T3 (es) * 2015-04-09 2021-03-30 Ge Energy Power Conversion Technology Ltd Máquina eléctrica y método
CN104795953A (zh) * 2015-04-29 2015-07-22 山东大学 一种定转子分块式开关磁阻电机
WO2016183419A1 (fr) * 2015-05-13 2016-11-17 Black & Decker Inc. Charge de batterie embarquée et freinage par récupération
US10491066B2 (en) * 2015-06-16 2019-11-26 Danfoss Editron Oy Method and arrangement for adjusting the magnetization of a permanent magnet machine
CN106329821B (zh) * 2015-06-26 2018-11-20 佛山市建准电子有限公司 马达系统及使用该马达系统的风扇系统
KR20180093872A (ko) 2015-08-11 2018-08-22 제네시스 로보틱스 엘엘피 전기 기계
US11139707B2 (en) 2015-08-11 2021-10-05 Genesis Robotics And Motion Technologies Canada, Ulc Axial gap electric machine with permanent magnets arranged between posts
CN106549471B (zh) * 2015-09-17 2021-11-05 戴洛格半导体（英国）有限公司 功率管理电路
US9933805B2 (en) * 2016-06-27 2018-04-03 Abb Schweiz Ag Power converter using wide band-gap devices
US11043885B2 (en) 2016-07-15 2021-06-22 Genesis Robotics And Motion Technologies Canada, Ulc Rotary actuator
US10917029B2 (en) * 2017-03-17 2021-02-09 Vitesco Technologies USA, LLC Pi source inverter-converter for hybrid electric vehicles
CN107040110B (zh) * 2017-05-17 2019-07-16 安徽弘浩节能科技有限公司 四相32/24结构开关磁阻电机及其转子位置检测方法
US10693336B2 (en) 2017-06-02 2020-06-23 Whirlpool Corporation Winding configuration electric motor
US10707785B2 (en) * 2017-07-14 2020-07-07 Pen-Yi Liao Simple rugged motor and compressors built thereby
CN107394813A (zh) * 2017-07-17 2017-11-24 国家电网公司 一种基于储能系统的风电并网协调控制装置及方法
US10666097B2 (en) 2017-12-12 2020-05-26 Hamilton Sundstrand Corporation Switched reluctance electric machine including pole flux barriers
TWI730281B (zh) 2018-01-03 2021-06-11 美商米沃奇電子工具公司 電動工具中之電子制動技術
CN108459199B (zh) * 2018-02-10 2020-04-21 合肥工业大学 改进的开关磁阻电机电流采样方法
JP7267564B2 (ja) * 2018-08-06 2023-05-02 政行 梨木 モータとその制御装置
CN111384790A (zh) * 2018-12-28 2020-07-07 福特全球技术公司 用于电机的定子及电机
US10978980B2 (en) 2019-07-08 2021-04-13 Karma Automotive Llc Switched reluctance motor control
US11131491B1 (en) 2020-08-07 2021-09-28 Emerson Climate Technologies, Inc. Systems and methods for multi-stage operation of a compressor
CN112366839B (zh) * 2020-09-22 2022-05-13 珠海格力节能环保制冷技术研究中心有限公司 定子和电机
JP2022055707A (ja) * 2020-09-29 2022-04-08 本田技研工業株式会社 回転電機

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4743825A (en) * 1983-09-27 1988-05-10 Kabushiki Kaisha Okuma Tekkosho Synchronous motors and a control system thereof
US5053666A (en) * 1988-06-06 1991-10-01 General Electric Company Construction of reluctance motors
US5604388A (en) * 1994-02-16 1997-02-18 Emerson Electric Co. Switched reluctance rotor molded lug
US5739615A (en) * 1995-07-24 1998-04-14 Switched Reluctance Drives Limited Rotor for reluctance machine
US7015615B2 (en) * 2003-03-17 2006-03-21 Virginia Tech Intellectual Properties, Inc. Apparatus and method that prevent flux reversal in the stator back material of a two-phase SRM (TPSRM)

Family Cites Families (74)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR317609A (fr) 1902-01-07 1902-09-17 Senstius Un inducteur à saturation différentielle muni d'un régulateur magnétique de flux
CH153588A (de) 1931-03-18 1932-03-31 Oerlikon Maschf Magnetpol für elektrische Maschinen.
FR856500A (fr) 1939-03-01 1940-06-14 Comp Generale Electricite Perfectionnements à la compensation de la réaction d'induit des génératrices à courant continu à tension variable
GB1300549A (en) * 1969-01-29 1972-12-20 Electro Dynamic Construction C Improvements in and relating to variable speed d.c. motor control arrangements and d.c. motors therefor
JPS51125804A (en) 1975-04-25 1976-11-02 Hitachi Ltd Rotary machine stator core
US4217511A (en) 1978-06-13 1980-08-12 Westinghouse Electric Corp. Stator core cooling for dynamoelectric machines
JPS6034338B2 (ja) * 1979-01-11 1985-08-08 株式会社東芝 回転電機
GB2118785B (en) * 1982-03-10 1986-08-13 Japan Servo Direct-current brushless motor
JPS58165640A (ja) * 1982-03-26 1983-09-30 Toshiba Corp 回転電機の積層鉄心
US4475051A (en) 1982-08-27 1984-10-02 International Business Machines Corporation Low inertia high torque variable reluctance motor
DE3331002A1 (de) 1983-08-27 1985-03-14 Robert Bosch Gmbh, 7000 Stuttgart Elektrische maschine
US4500824A (en) * 1984-05-21 1985-02-19 General Electric Company Method of commutation and converter circuit for switched reluctance motors
US4684867A (en) * 1984-05-31 1987-08-04 General Electric Company Regenerative unipolar converter for switched reluctance motors using one main switching device per phase
US4795936A (en) * 1986-08-26 1989-01-03 Midwest Dynamometer & Engineering Co. Driven rotary shaft system using permanent magnets
US4812696A (en) * 1987-02-17 1989-03-14 Louis Stanley Motor core with winding slots having reduced air gaps
US4990809A (en) * 1987-04-27 1991-02-05 The Superior Electric Company Variable reluctance motor
JPS6469239A (en) * 1987-09-07 1989-03-15 Toshiba Corp Rotary electric machine for vehicle
US5015903A (en) 1988-08-15 1991-05-14 Pacific Scientific Company Electronically commutated reluctance motor
US4920259A (en) * 1988-09-30 1990-04-24 Hewlett-Packard Company Apparatus for producing a phase insensitive index pulse for motion encoders
US5005281A (en) * 1990-08-20 1991-04-09 Dynamics Systems International Inc. Method of making rotor and stator pole assemblies by stamping magnetic plate
US5250867A (en) * 1991-11-20 1993-10-05 General Electric Company Permanent magnet brushless DC motor having reduced cogging
GB9200792D0 (en) * 1992-01-15 1992-03-11 Macon Management & Design Ltd A motor
GB9316842D0 (en) * 1993-08-13 1993-09-29 Lucas Ind Plc Improved optical torque sensor
GB9408056D0 (en) * 1994-04-22 1994-06-15 Switched Reluctance Drives Ltd A control circuit for an inductive load
GB9513662D0 (en) 1995-07-05 1995-09-06 Univ Warwick Switched reluctance electric machine system
FR2742940B1 (fr) 1995-12-22 1998-03-13 Moving Magnet Tech Moteur diphase, notamment un moteur d'horlogerie ou un moteur pour l'entrainement d'une aiguille d'un afficheur
CA2242734A1 (fr) * 1996-01-22 1997-07-31 Michael John Flowerday Moteur a poles axiaux
GB9608216D0 (en) 1996-04-19 1996-06-26 Switched Reluctance Drives Ltd Converter circuit for a polyphase switched inductive load
JPH09294359A (ja) * 1996-04-25 1997-11-11 Aisin Seiki Co Ltd スイッチドリラクタンスモータ
US5838087A (en) 1996-08-30 1998-11-17 Emerson Electric Co. Reluctance machine
DE19704939A1 (de) * 1997-02-10 1998-08-20 Stegmann Max Antriebstech Verfahren und Vorrichtung zur Regelung der Drehzahl einer Ausgangswelle
US6043483A (en) * 1997-12-29 2000-03-28 Radica China Limited Apparatus and method using an indexed-encoder to sense the absolute position of an object with a single set of optics
GB9818878D0 (en) * 1998-08-28 1998-10-21 Switched Reluctance Drives Ltd Switched reluctance drive with high power factor
US6091168A (en) 1998-12-22 2000-07-18 Hamilton Sundstrand Corporation Rotor for a dynamoelectric machine
SE521663C2 (sv) * 1999-01-26 2003-11-25 Abb Ab Sätt att förbättra utnyttjningen av en roterande elektrisk likströmsmaskin i vilken kylfluid leds genom axiella kylkanaler i rotorn samt roterande elektrisk likströmsmaskin och rotor i en sådan maskin
ATE258342T1 (de) * 1999-08-17 2004-02-15 Black & Decker Inc Ansteuerung einer elektrischen reluktanz maschine
SE518110C2 (sv) * 1999-12-23 2002-08-27 Hoeganaes Ab Stator och rotor för en elektrisk maskin
US6720686B1 (en) * 2000-10-03 2004-04-13 Emerson Electric Co. Reduced noise dynamoelectric machine
GB0028602D0 (en) * 2000-11-23 2001-01-10 Switched Reluctance Drives Ltd Operation of switched reluctance drive systems from dual voltage sources
US7372232B2 (en) * 2002-05-24 2008-05-13 Virginia Tech Intellectual Properties, Inc. Apparatus for drive control, power conversion, and start-up control in a PMBDCM or two-phase SRM drive system
TW200405646A (en) 2002-05-24 2004-04-01 Virginia Tech Intell Prop Method, apparatus, and system for drive control, power conversion, and start-up control in an SRM or PMBDCM drive system
US7420308B2 (en) * 2002-05-24 2008-09-02 Virginia Tech Intellectual Properties, Inc. PMBDCM and two phase SRM motor, two phase SRM rotor and stator, and coil wrap for PMBDCM and SRM motors
US7084597B2 (en) * 2002-06-03 2006-08-01 Denso Corporation Motor control apparatus
US6822368B2 (en) * 2002-06-04 2004-11-23 Wavecrest Laboratories, Llc Rotary permanent magnet electric motor having stator pole shoes of varying dimensions
DE10229333A1 (de) * 2002-06-29 2004-01-29 Robert Bosch Gmbh Elektrische Maschine, insbesondere bürstenlose Maschine mit permanentmagnetisch erregtem Läufer
GB0215849D0 (en) 2002-07-09 2002-08-14 Switched Reluctance Drives Ltd Starting of switched reluctance generators
US6987375B2 (en) 2002-10-30 2006-01-17 Delphi Technologies, Inc. Dual-stage drive for switched reluctance electric machines
US20080246362A1 (en) 2003-06-12 2008-10-09 Hirzel Andrew D Radial airgap, transverse flux machine
US6988689B2 (en) 2003-10-10 2006-01-24 Bay West Paper Corporation Hands-free towel dispenser with EMF controller
BRPI0402045B1 (pt) 2004-05-12 2021-04-13 Oscar Rolando Avilla Cusicanqui Motor elétrico híbrido de relutância
CN1292937C (zh) * 2004-06-15 2007-01-03 浙江大学 一种轻型交通工具的集成电力驱动系统
US7081697B2 (en) * 2004-06-16 2006-07-25 Visteon Global Technologies, Inc. Dynamoelectric machine stator core with mini caps
US7085638B2 (en) * 2004-07-13 2006-08-01 Robert Bosch Gmbh Steering angle sensor assembly including reduction gear and logic module
KR100704482B1 (ko) 2005-04-01 2007-04-09 엘지전자 주식회사 저속 영역과 고속 영역에서의 발전 효율이 개선된 에스알발전기
KR100653434B1 (ko) * 2005-04-29 2006-12-01 영 춘 정 2상 무정류자 모터
DE102005022548A1 (de) 2005-05-17 2006-11-23 Siemens Ag Elektrische Maschine mit einem Wicklungssystem mit Spulengruppen
FR2887697B1 (fr) * 2005-06-28 2010-11-19 Valeo Equip Electr Moteur Machine electrique tournante possedant des moyens de reduction de pertes
US20070008744A1 (en) 2005-07-07 2007-01-11 Samsung Electro-Mechanics Co., Ltd. High efficiency half-bridge dc/dc convertor
US7348706B2 (en) 2005-10-31 2008-03-25 A. O. Smith Corporation Stator assembly for an electric machine and method of manufacturing the same
KR100668118B1 (ko) 2005-12-30 2007-01-16 한국전기연구원 권선형 유도 발전기 제어용 전력변환장치 및 전력변환방법
FR2899396B1 (fr) * 2006-03-30 2008-07-04 Moving Magnet Tech Mmt Moteur electrique polyphase notamment pour l'entrainement de pompes ou de ventilateurs
US7521835B2 (en) * 2006-06-27 2009-04-21 General Electric Company Permanent magnet machine with windings having strand transposition
JP5134846B2 (ja) 2007-03-26 2013-01-30 株式会社東芝 永久磁石電動機ドライブシステム
WO2008153832A2 (fr) * 2007-05-31 2008-12-18 Krishnan Ramu Machines a reluctance commutee pourvues d'un noyau de stator minimal
US7852038B2 (en) 2007-08-14 2010-12-14 Ramu Inc. Single switch controlled switched reluctance machine
US8264182B2 (en) 2007-08-14 2012-09-11 Ramu, Inc. Motor power factor correction apparatus and method
CN101159422A (zh) * 2007-10-16 2008-04-09 李平 具有近似恒功率牵引电机特性的永磁直流电机驱动控制系统
CN201118414Y (zh) 2007-10-29 2008-09-17 深圳航天科技创新研究院 方波三相无刷永磁直流电动机
DE102007060688A1 (de) * 2007-12-17 2009-06-18 Siemens Ag Elektrische Maschine mit integriertem Drehgeber
CA2732646C (fr) * 2008-07-30 2016-01-12 A.O. Smith Corporation Moteur a aimants permanents interieurs comprenant un rotor avec des poles inegaux
CN102239625A (zh) 2008-09-23 2011-11-09 艾罗威罗门特公司 无铁芯电动机的通量集中器
KR20110010922A (ko) * 2009-07-27 2011-02-08 삼성전자주식회사 미세유동 장치, 이를 포함하는 미세유동 시스템 및 미세유동 장치의 기준각 검출 방법
KR101583120B1 (ko) 2010-08-25 2016-01-07 도요타지도샤가부시키가이샤 전지용 전극의 제조 방법
US8952591B2 (en) 2010-11-03 2015-02-10 Regal Beloit America, Inc. Rotor lamination shaping for minimum core loss in SRMs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4743825A (en) * 1983-09-27 1988-05-10 Kabushiki Kaisha Okuma Tekkosho Synchronous motors and a control system thereof
US5053666A (en) * 1988-06-06 1991-10-01 General Electric Company Construction of reluctance motors
US5604388A (en) * 1994-02-16 1997-02-18 Emerson Electric Co. Switched reluctance rotor molded lug
US5739615A (en) * 1995-07-24 1998-04-14 Switched Reluctance Drives Limited Rotor for reluctance machine
US7015615B2 (en) * 2003-03-17 2006-03-21 Virginia Tech Intellectual Properties, Inc. Apparatus and method that prevent flux reversal in the stator back material of a two-phase SRM (TPSRM)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110260672A1 (en) * 2010-04-26 2011-10-27 Krishnan Ramu High power density switched reluctance machines with hybrid excitation
US9093943B2 (en) * 2010-04-26 2015-07-28 Regal Beloit America, Inc. High power density switched reluctance machines with hybrid excitation
US9136736B2 (en) 2012-06-06 2015-09-15 Nidec Motor Corporation Motor having spoked outer rotor with spaced apart pole segments
WO2015038125A1 (fr) * 2013-09-12 2015-03-19 Nissan Motor Co., Ltd. Rotor destiné à une machine à magnétisation variable
WO2017101033A1 (fr) * 2015-12-15 2017-06-22 郑州吉田专利运营有限公司 Moteur à réluctance commutée
CN105958685A (zh) * 2016-06-14 2016-09-21 广东明阳龙源电力电子有限公司 一种新型开关磁阻电机转子塑封机构
US20190238023A1 (en) * 2018-01-30 2019-08-01 Honda Motor Co., Ltd. Rotor of rotating electrical machine
CN113489203A (zh) * 2021-07-01 2021-10-08 南京航空航天大学 一种四相电励磁双凸极电机

Also Published As

Publication number Publication date
WO2012061273A2 (fr) 2012-05-10
US20120104984A1 (en) 2012-05-03
WO2012061273A3 (fr) 2014-04-03
US20120104980A1 (en) 2012-05-03
WO2012061271A2 (fr) 2012-05-10
WO2012061270A2 (fr) 2012-05-10
WO2012061456A1 (fr) 2012-05-10
WO2012061458A1 (fr) 2012-05-10
US8716961B2 (en) 2014-05-06
WO2012061270A3 (fr) 2012-05-31
US9312733B2 (en) 2016-04-12
US8952591B2 (en) 2015-02-10
US20120104988A1 (en) 2012-05-03
WO2012061271A3 (fr) 2014-07-10
CN103190069A (zh) 2013-07-03
WO2012061270A4 (fr) 2012-06-28
US8754605B2 (en) 2014-06-17
US9054567B2 (en) 2015-06-09
US20120104982A1 (en) 2012-05-03
US20120104895A1 (en) 2012-05-03
EP2636141A1 (fr) 2013-09-11
US20150124267A1 (en) 2015-05-07

Similar Documents

Publication Publication Date Title
US20120104879A1 (en) Noise reduction structures for electrical machines
JP6422595B2 (ja) 電動機および空気調和機
US7880358B2 (en) Rotor of permanent magnet rotating electric machine
JP5059614B2 (ja) 永久磁石埋め込み型ロータにおける磁石およびウエブの構成
US7332845B2 (en) Spoke permanent magnet rotor
US10284032B2 (en) Reluctance rotor with runup aid
JP6599005B2 (ja) コンシクエントポール型の回転子、電動機および空気調和機
JPWO2007123107A1 (ja) モータ
WO2003055045A1 (fr) Machine dynamoelectrique du type a aimants permanents et generateur synchrone du type a aimants permanents utilisant l'energie eolienne
US6946760B2 (en) Brushless permanent magnet motor with high power density, low cogging and low vibration
JP2008099479A (ja) 回転電機における磁石埋め込み型ロータと該ロータを用いた回転電機
JP6545393B2 (ja) コンシクエントポール型の回転子、電動機および空気調和機
JPWO2022019074A5 (fr)
JP4569632B2 (ja) モータ
JP5439904B2 (ja) 回転電機
JP2004015998A (ja) 軸方向に分割された三相固定子巻線を有する永久磁石型回転機
JP2003333811A (ja) 軸方向に分割された複数の固定子巻線を有する誘導電動機
KR100908126B1 (ko) 매입형 영구자석 전동기의 회전자
JP2020068562A (ja) 電動機及びそれを用いた電動送風機、電気掃除機
WO2022219942A1 (fr) Rotor et moteur électrique
WO2022255038A1 (fr) Rotor et moteur électrique
WO2023276514A1 (fr) Rotor, son procédé de fabrication et moteur électrique
WO2017022044A1 (fr) Dispositif de transmission d'énergie
KR101448649B1 (ko) 모터
KR100252392B1 (ko) 영구자석매립형회전자구조

Legal Events

Date Code Title Description
AS Assignment

Owner name: RAMU, INC., VIRGINIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAMU, KRISHNAN;REEL/FRAME:027962/0047

Effective date: 20111201

AS Assignment

Owner name: RBC MANUFACTURING CORPORATION, WISCONSIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAMU, INC.;REEL/FRAME:029577/0145

Effective date: 20121231

AS Assignment

Owner name: REGAL BELOIT AMERICA, INC., WISCONSIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RBC MANUFACTURING CORPORATION;REEL/FRAME:029582/0236

Effective date: 20121231

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE