CN114678981A - Hybrid excitation method of permanent magnet synchronous generator - Google Patents

Hybrid excitation method of permanent magnet synchronous generator Download PDF

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Publication number
CN114678981A
CN114678981A CN202210339573.1A CN202210339573A CN114678981A CN 114678981 A CN114678981 A CN 114678981A CN 202210339573 A CN202210339573 A CN 202210339573A CN 114678981 A CN114678981 A CN 114678981A
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CN
China
Prior art keywords
driving
induction
pole
drive
drive end
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Pending
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CN202210339573.1A
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Chinese (zh)
Inventor
周效龙
袁洁
刘友生
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CSIC Electrical Machinery Science and Technology Co Ltd
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CSIC Electrical Machinery Science and Technology Co Ltd
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Priority to CN202210339573.1A priority Critical patent/CN114678981A/en
Publication of CN114678981A publication Critical patent/CN114678981A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/17Stator cores with permanent magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/18Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/46Fastening of windings on the stator or rotor structure
    • H02K3/50Fastening of winding heads, equalising connectors, or connections thereto

Abstract

The invention discloses a hybrid excitation method of a permanent magnet synchronous generator, which solves the problem that a rotating excitation winding in the existing hybrid excitation synchronous generator occupies a large space. The space in the end part of the motor stator winding is fully utilized, the exciting winding coil and the induction magnetic pole are arranged in the space on the inner side of the end part of the motor winding, the magnetic flux emitted by the induction magnetic pole and emitted by the induction magnetic pole is changed by changing the current magnitude and direction in the exciting winding coil, and the magnetic flux generated by the permanent magnetic pole is enhanced or weakened through the magnetic flux, so that the effect of enhancing or weakening the air gap field of the motor is achieved, and the speed regulation range of the synchronous generator is widened; the problems of wide speed regulation and constant power output of the 25KW permanent magnet generator under the harsh small-volume requirement are effectively solved, and the speed regulation range of the permanent magnet synchronous generator is widened.

Description

Hybrid excitation method of permanent magnet synchronous generator
Technical Field
The invention relates to a synchronous generator, in particular to a hybrid excitation structure of the synchronous generator.
Background
For the traditional permanent magnet synchronous generator, the speed regulation range is narrow due to the difficulty in regulating the air gap flux, so that the application range is limited; in order to widen the speed regulation range of the permanent magnet synchronous generator, a mixed excitation mode can be adopted to adjust the air gap flux of the motor so as to achieve the purpose of widening the speed regulation range of the motor; the hybrid excitation generally refers to the fact that the hybrid excitation comprises two excitation sources, namely a permanent magnet and an excitation winding, the permanent magnet generates main air gap magnetic flux, the excitation winding generates auxiliary air gap magnetic flux, and the excitation winding can achieve the effect of strengthening or weakening the air gap magnetic field of the motor by changing the magnitude and the direction of excitation current so as to widen the speed regulation range of the synchronous generator; an excitation winding in the existing mixed excitation permanent magnet synchronous generator mostly adopts a rotary rectifier type double-stator mixed structure, and the structure has the defect of large occupied space and is difficult to meet the use occasion with strict volume requirement; how to utilize the space inside the base of the permanent magnet synchronous generator to realize hybrid excitation, thereby achieving the purpose of widening the speed regulation range of the permanent magnet synchronous generator and becoming a problem to be solved.
Disclosure of Invention
The invention provides a hybrid excitation method of a permanent magnet synchronous generator, which solves the technical problem that a rotating excitation winding in the existing hybrid excitation synchronous generator occupies a large space.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: the space in the end part of the motor stator winding is fully utilized, the exciting winding coil and the induction magnetic pole are arranged in the space on the inner side of the end part of the motor winding, the magnetic flux emitted by the induction magnetic pole and emitted by the permanent magnetic pole is changed by changing the current magnitude and direction in the exciting winding coil, and the magnetic flux generated by the permanent magnetic pole is enhanced or weakened through the magnetic flux, so that the effect of enhancing or weakening the air gap field of the motor is achieved, and the speed regulation range of the synchronous generator is widened.
A mixed excitation structure of a permanent magnet synchronous generator comprises a base, wherein a drive end motor end cover and a non-drive end motor end cover are respectively arranged on the base, a rotating shaft is arranged between the drive end motor end cover and the non-drive end motor end cover, a rotor core is arranged on the rotating shaft, surface-mounted magnetic steel is arranged on the outer side surface of the rotor core, a stator core is arranged in the base, a stator winding is embedded in the stator core, a drive end winding end part is arranged on the drive end side of the stator core, a non-drive end winding end part is arranged on the non-drive end side of the stator core, a support cup body sleeved with an induction magnetic pole is arranged on the drive end of the rotating shaft in the base, S-pole sector induction magnets are respectively arranged on the excircle of the support cup body of the induction magnetic pole, and an N-pole arc induction magnet is arranged between two adjacent S-pole sector induction magnets, the rotating body is arranged in the inner side space of the end part of the drive end winding, a drive end excitation winding iron core is connected to the inner side surface of the end cover of the drive end motor, a drive end excitation coil is embedded in the drive end excitation winding iron core, and the drive end excitation coil is arranged in a cup cavity of a support cup body of the induction magnetic pole.
A supporting cup body of an induction magnetic pole of a non-driving end is sleeved on the non-driving end of a rotating shaft in the machine base, the excircle of the supporting cup body of the induction magnetic pole of the non-driving end is respectively provided with an S-pole sector induction magnet of the non-driving end, between the S-pole sector induction magnets of two adjacent non-driving ends, N-pole arc induction magnets of the non-driving ends are arranged, the S-pole sector induction magnets of the non-driving ends and the N-pole arc induction magnets of the non-driving ends which are arranged at intervals form a non-driving-end rotating body which rotates along with the rotating shaft, the non-drive end rotating body is arranged in the inner side space of the end part of the non-drive end winding, the inner side surface of the end cover of the non-drive end motor is connected with a non-drive end excitation winding iron core, a non-drive end excitation coil is embedded in the non-drive end excitation winding iron core and is arranged in a cup cavity of a support cup body of the non-drive end induction magnetic pole; the non-drive-end rotor magnetic isolation plate is arranged on the stator core outside the drive-end rotor magnetic isolation plate, and the non-drive-end stator magnetic isolation plate is arranged on the stator core outside the non-drive-end rotor magnetic isolation plate.
A mixed excitation method of a permanent magnet synchronous generator comprises a base, a drive end motor end cover and a non-drive end motor end cover are respectively arranged on the base, a rotating shaft is arranged between the drive end motor end cover and the non-drive end motor end cover, a rotor core is arranged on the rotating shaft, surface-mounted magnetic steel is arranged on the outer side surface of the rotor core, a stator core is arranged in the base, a stator winding is embedded in the stator core, a drive end winding end is arranged on the drive end side of the stator core, a non-drive end winding end is arranged on the non-drive end side of the stator core, a support cup body sleeved with an induction magnetic pole is arranged on the drive end of the rotating shaft in the base, S-pole sector induction magnets are respectively arranged on the excircle of the support cup body of the induction magnetic pole, and an N-pole arc induction magnet is arranged between two adjacent S-pole sector induction magnets, the rotating body is arranged in the inner space of the end part of the drive end winding, a drive end excitation winding iron core is connected to the inner side surface of the end cover of the drive end motor, a drive end excitation coil is embedded in the drive end excitation winding iron core, and the drive end excitation coil is arranged in a cup cavity of a support cup body of the induction magnetic pole; the method is characterized by comprising the following steps: when the rotating shaft of the motor rotates, the magnitude and the direction of the power supply direct current of the drive end excitation coil are changed, so that the magnetic flux induced between the S pole fan-shaped induction magnet and the N pole arc induction magnet is changed, and the rotating speed of the permanent magnet synchronous generator is changed.
A supporting cup body of an induction magnetic pole of a non-driving end is sleeved on the non-driving end of a rotating shaft in the machine base, the excircle of the supporting cup body of the induction magnetic pole of the non-driving end is respectively provided with an S-pole sector induction magnet of the non-driving end, between the S-pole sector induction magnets of two adjacent non-driving ends, N-pole arc induction magnets of the non-driving ends are arranged, the S-pole sector induction magnets of the non-driving ends and the N-pole arc induction magnets of the non-driving ends which are arranged at intervals form a non-driving-end rotating body which rotates along with the rotating shaft, the non-drive end rotating body is arranged in the inner side space of the non-drive end winding end part, a non-drive end excitation winding iron core is connected to the inner side surface of the non-drive end motor end cover, a non-drive end excitation coil is embedded in the non-drive end excitation winding iron core and is arranged in a cup cavity of a support cup body of the non-drive end induction magnetic pole; the magnitude and the direction of the power supply direct current of the excitation coil of the non-driving end are changed, so that the magnetic flux induced between the S-pole fan-shaped induction magnet of the non-driving end and the N-pole arc induction magnet of the non-driving end is changed, and the rotating speed of the permanent magnet synchronous generator is changed; the non-drive-end excitation coil and the drive-end excitation coil are connected in series and then are powered by the same direct-current power supply.
The mixed excitation structure scheme of the invention effectively solves the problems of wide speed regulation and constant power output of a 25KW permanent magnet generator under the harsh small-volume requirement, and widens the speed regulation range of the permanent magnet synchronous generator.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of a support cup 11 of an induction pole and the induction pole mounted on a rotating shaft 8 according to the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a mixed excitation structure of a permanent magnet synchronous generator comprises a base 1, a drive end motor end cover 2 and a non-drive end motor end cover 3 are respectively arranged on the base 1, a rotating shaft 8 is arranged between the drive end motor end cover 2 and the non-drive end motor end cover 3, a rotor core 9 is arranged on the rotating shaft 8, surface-mounted magnetic steel 10 is arranged on the outer side surface of the rotor core 9, a stator core 4 is arranged in the base 1, a stator winding 5 is embedded in the stator core 4, a drive end winding end part 6 is arranged on the drive end side of the stator core 4, a non-drive end winding end part 7 is arranged on the non-drive end side of the stator core 4, a support cup body 11 sleeved with induction magnetic poles is arranged on the drive end of the rotating shaft 8 in the base 1, S-pole sector induction magnets 12 are respectively arranged on the excircle of the support cup body 11 of the induction magnetic poles, and between two adjacent S-pole sector induction magnets 12, the magnetic induction type motor is provided with an N-pole arc induction magnet 13, an S-pole sector induction magnet 12 and the N-pole arc induction magnet 13 which are arranged at intervals form a rotating body which rotates along with a rotating shaft 8, the rotating body is arranged in the inner side space of a driving end winding end part 6, a driving end excitation winding iron core 14 is connected to the inner side surface of a driving end motor end cover 2, a driving end excitation coil 15 is embedded into the driving end excitation winding iron core 14, and the driving end excitation coil 15 is arranged in a cup cavity of a supporting cup body 11 of an induction magnetic pole.
A supporting cup 18 of an induction magnetic pole of the non-driving end is sleeved on the non-driving end of the rotating shaft 8 in the machine base 1, on the excircle of the supporting cup 18 of the induction magnetic pole of the non-driving end, S-pole sector induction magnets of the non-driving end are respectively arranged, between the adjacent S-pole sector induction magnets of two non-driving ends, N-pole arc induction magnets of the non-driving ends are arranged, the S-pole sector induction magnets of the non-driving ends and the N-pole arc induction magnets of the non-driving ends which are arranged at intervals form a non-driving-end rotating body which rotates along with the rotating shaft 8, the non-drive end rotating body is arranged in the inner side space of the non-drive end winding end part 7, a non-drive end excitation winding iron core 16 is connected to the inner side surface of the non-drive end motor end cover 2, a non-drive end excitation coil 17 is embedded in the non-drive end excitation winding iron core 16, and the non-drive end excitation coil 17 is arranged in a cup cavity of a support cup body 18 of the non-drive end induction magnetic pole; a drive-end rotor magnetic-isolation plate 19 is provided on the rotating shaft 8 between the rotor core 9 and the support cup 11 of the induction magnetic pole, a non-drive-end rotor magnetic-isolation plate 20 is provided on the rotating shaft 8 between the rotor core 9 and the support cup 18 of the induction magnetic pole of the non-drive end, a drive-end stator magnetic-isolation plate 21 is provided on the stator core 4 outside the drive-end rotor magnetic-isolation plate 19, and a non-drive-end stator magnetic-isolation plate 22 is provided on the stator core 4 outside the non-drive-end rotor magnetic-isolation plate 20.
A hybrid excitation method of a permanent magnet synchronous generator comprises a base 1, a drive end motor end cover 2 and a non-drive end motor end cover 3 are respectively arranged on the base 1, a rotating shaft 8 is arranged between the drive end motor end cover 2 and the non-drive end motor end cover 3, a rotor core 9 is arranged on the rotating shaft 8, surface-mounted magnetic steel 10 is arranged on the outer side surface of the rotor core 9, a stator core 4 is arranged in the base 1, a stator winding 5 is embedded in the stator core 4, a drive end winding end part 6 is arranged on the drive end side of the stator core 4, a non-drive end winding end part 7 is arranged on the non-drive end side of the stator core 4, a support cup body 11 of an induction magnetic pole is sleeved on the drive end of the rotating shaft 8 in the base 1, S-pole sector induction magnets 12 are respectively arranged on the excircle of the support cup body 11 of the induction magnetic pole, and between two adjacent S-pole sector induction magnets 12, the magnetic induction cup is provided with an N-pole arc induction magnet 13, and S-pole sector induction magnets 12 and N-pole arc induction magnets 13 which are arranged at intervals form a rotating body which rotates along with a rotating shaft 8, the rotating body is arranged in the inner space of a driving end winding end part 6, a driving end excitation winding iron core 14 is connected to the inner side surface of a driving end motor end cover 2, a driving end excitation coil 15 is embedded in the driving end excitation winding iron core 14, and the driving end excitation coil 15 is arranged in a cup cavity of a support cup body 11 of an induction magnetic pole; the method is characterized by comprising the following steps: when the rotating shaft 8 of the motor rotates, the magnitude and the direction of the direct current supplied to the drive end magnet exciting coil 15 are changed, so that the magnetic flux induced between the S pole fan-shaped induction magnet 12 and the N pole arc induction magnet 13 is changed, and the rotating speed of the permanent magnet synchronous generator is changed.
A supporting cup 18 of an induction magnetic pole of the non-driving end is sleeved on the non-driving end of the rotating shaft 8 in the machine base 1, on the excircle of the supporting cup 18 of the induction magnetic pole of the non-driving end, S-pole sector induction magnets of the non-driving end are respectively arranged, between the adjacent S-pole sector induction magnets of two non-driving ends, N-pole arc induction magnets of the non-driving ends are arranged, the S-pole sector induction magnets of the non-driving ends and the N-pole arc induction magnets of the non-driving ends which are arranged at intervals form a non-driving-end rotating body which rotates along with the rotating shaft 8, the non-drive end rotating body is arranged in the inner side space of the non-drive end winding end part 7, a non-drive end excitation winding iron core 16 is connected on the inner side surface of the non-drive end motor end cover 2, a non-drive end excitation coil 17 is embedded in the non-drive end excitation winding iron core 16, and the non-drive end excitation coil 17 is arranged in a cup cavity of a support cup body 18 of the non-drive end induction magnetic pole; the magnitude and the direction of the power supply direct current of the excitation coil 17 of the non-driving end are changed, so that the magnetic flux induced between the S-pole fan-shaped induction magnet 12 of the non-driving end and the N-pole arc induction magnet 13 of the non-driving end is changed, and the rotating speed of the permanent magnet synchronous generator is changed; the non-drive-end excitation coil 17 and the drive-end excitation coil 15 are connected in series and then powered by the same dc power supply.
Two sets of excitation systems are respectively and symmetrically arranged on two sides of a rotor, a series connection or independent connection mode is adopted, the spaces at two ends of a main fixed winding are fully utilized, the magnetic circuits of the excitation magnetic flux of an integral induction magnetic pole and the permanent magnetic flux are connected in parallel at an arc-shaped magnetic pole, the magnetic resistance of the magnetic steel is far greater than that of an iron core, most of the magnetic flux generated by the excitation current enters an air gap through the iron core instead of a permanent magnet, and when the motor is subjected to field weakening or field increasing speed regulation, the rotor does not have the risk of permanent field loss; meanwhile, the permanent magnet generates main air gap magnetic flux, the excitation winding generates auxiliary air gap magnetic flux, and the air gap magnetic field of the motor can be enhanced or weakened by changing the current magnitude and direction of the excitation winding, so that the motor can meet the requirements of wide speed regulation of 800r/min-3750r/min and constant power output.

Claims (2)

1. A hybrid excitation method of a permanent magnet synchronous generator comprises a base (1), a drive end motor end cover (2) and a non-drive end motor end cover (3) are respectively arranged on the base (1), a rotating shaft (8) is arranged between the drive end motor end cover (2) and the non-drive end motor end cover (3), a rotor core (9) is arranged on the rotating shaft (8), surface-mounted magnetic steel (10) is arranged on the outer side surface of the rotor core (9), a stator core (4) is arranged in the base (1), a stator winding (5) is embedded in the stator core (4), a drive end winding end part (6) is arranged on the drive end side of the stator core (4), a non-drive end winding end part (7) is arranged on the non-drive end side of the stator core (4), a support cup body (11) of an induction magnetic pole is sleeved on the drive end of the rotating shaft (8) in the base (1), s-pole sector induction magnets (12) are respectively arranged on the excircle of a supporting cup body (11) of an induction magnetic pole, an N-pole arc induction magnet (13) is arranged between two adjacent S-pole sector induction magnets (12), the S-pole sector induction magnets (12) and the N-pole arc induction magnets (13) which are arranged at intervals form a rotating body which rotates along with a rotating shaft (8), the rotating body is arranged in the inner space of a driving-end winding end part (6), a driving-end excitation winding iron core (14) is connected to the inner side surface of a driving-end motor end cover (2), a driving-end excitation coil (15) is embedded in the driving-end excitation winding iron core (14), and the driving-end excitation coil (15) is arranged in a cup cavity of the supporting cup body (11) of the induction magnetic pole; the method is characterized by comprising the following steps: when a rotating shaft (8) of the motor rotates, the magnitude and the direction of the power supply direct current of the drive end magnet exciting coil (15) are changed, so that the magnetic flux induced between the S-pole fan-shaped induction magnet (12) and the N-pole arc induction magnet (13) is changed, and the rotating speed of the permanent magnet synchronous generator is changed.
2. The hybrid excitation method of a permanent magnet synchronous generator according to claim 1, characterized in that a support cup (18) of the induction magnetic pole of the non-driving end is sleeved on the non-driving end of the rotating shaft (8) in the machine base (1), S-pole sector induction magnets of the non-driving end are respectively arranged on the excircle of the support cup (18) of the induction magnetic pole of the non-driving end, N-pole arc induction magnets of the non-driving end are arranged between the S-pole sector induction magnets of two adjacent non-driving ends, the S-pole sector induction magnets of the non-driving end and the N-pole arc induction magnets of the non-driving end which are arranged at intervals form a non-driving end rotating body rotating along with the rotating shaft (8), the non-driving end rotating body is arranged in the inner space of the winding end (7) of the non-driving end, and a non-excitation winding core (16) is connected on the inner side of the end cover (2) of the motor of the non-driving end, a non-drive end excitation coil (17) is embedded in the non-drive end excitation winding iron core (16), and the non-drive end excitation coil (17) is arranged in a cup cavity of a support cup body (18) of the non-drive end induction magnetic pole; the magnitude and the direction of the power supply direct current of the excitation coil (17) of the non-driving end are changed, so that the magnetic flux induced between the S-pole fan-shaped induction magnet (12) of the non-driving end and the N-pole arc induction magnet (13) of the non-driving end is changed, and the rotating speed of the permanent magnet synchronous generator is changed; the non-drive-end magnet exciting coil (17) and the drive-end magnet exciting coil (15) are connected in series and then are powered by the same direct-current power supply.
CN202210339573.1A 2022-04-01 2022-04-01 Hybrid excitation method of permanent magnet synchronous generator Pending CN114678981A (en)

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Application Number Priority Date Filing Date Title
CN202210339573.1A CN114678981A (en) 2022-04-01 2022-04-01 Hybrid excitation method of permanent magnet synchronous generator

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Application Number Priority Date Filing Date Title
CN202210339573.1A CN114678981A (en) 2022-04-01 2022-04-01 Hybrid excitation method of permanent magnet synchronous generator

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101227130A (en) * 2007-11-19 2008-07-23 哈尔滨工业大学 Rotor magnetic field direct controlling mixed excitation synchronous machine
CN102315739A (en) * 2011-08-26 2012-01-11 北京航空航天大学 Hybrid excitation generator
CN103780039A (en) * 2014-01-16 2014-05-07 南京航空航天大学 Rotor circuit double-ended excitation type hybrid excitation electrical machine
CN104158370A (en) * 2014-07-14 2014-11-19 南京航空航天大学 Hybrid pole synchronous motor with independent rotor magnetic circuit
CN105896833A (en) * 2016-06-29 2016-08-24 山东大学 Hybrid excitation three-phase brushless synchronous generator based on full wave induction excitation
CN110061603A (en) * 2019-01-25 2019-07-26 南京航空航天大学 A kind of rotor magnetic circuit decoupling type mixed at high speed excitation magnetic synchronization motor
CN112398302A (en) * 2020-12-10 2021-02-23 沈阳工业大学 Wide speed regulation range hybrid excitation synchronous motor
CN112671193A (en) * 2020-11-25 2021-04-16 武汉船用电力推进装置研究所(中国船舶重工集团公司第七一二研究所) Mixed excitation type motor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101227130A (en) * 2007-11-19 2008-07-23 哈尔滨工业大学 Rotor magnetic field direct controlling mixed excitation synchronous machine
CN102315739A (en) * 2011-08-26 2012-01-11 北京航空航天大学 Hybrid excitation generator
CN103780039A (en) * 2014-01-16 2014-05-07 南京航空航天大学 Rotor circuit double-ended excitation type hybrid excitation electrical machine
CN104158370A (en) * 2014-07-14 2014-11-19 南京航空航天大学 Hybrid pole synchronous motor with independent rotor magnetic circuit
CN105896833A (en) * 2016-06-29 2016-08-24 山东大学 Hybrid excitation three-phase brushless synchronous generator based on full wave induction excitation
CN110061603A (en) * 2019-01-25 2019-07-26 南京航空航天大学 A kind of rotor magnetic circuit decoupling type mixed at high speed excitation magnetic synchronization motor
CN112671193A (en) * 2020-11-25 2021-04-16 武汉船用电力推进装置研究所(中国船舶重工集团公司第七一二研究所) Mixed excitation type motor
CN112398302A (en) * 2020-12-10 2021-02-23 沈阳工业大学 Wide speed regulation range hybrid excitation synchronous motor

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Application publication date: 20220628