CN102594069A - Thin-wall-cylinder type permanent magnet brushless direct-current motor with low cogging torque - Google Patents

Thin-wall-cylinder type permanent magnet brushless direct-current motor with low cogging torque Download PDF

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CN102594069A
CN102594069A CN2012100511953A CN201210051195A CN102594069A CN 102594069 A CN102594069 A CN 102594069A CN 2012100511953 A CN2012100511953 A CN 2012100511953A CN 201210051195 A CN201210051195 A CN 201210051195A CN 102594069 A CN102594069 A CN 102594069A
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winding
motor
stator
grooves
rotor
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CN102594069B (en
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史立伟
周波
魏佳丹
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Abstract

The invention provides a thin-wall-cylinder type permanent magnet brushless direct-current motor with low cogging torque, belonging to the technical field of special electrical machines. The motor comprises a flow guiding ring (6), stators (2), a shaft (9), a bearing (8), a support (7) and a rotors each of which consists of a rotor yoke (3), magnetic poles (1) and inner parts (4), wherein n N poles and n S poles of the permanent magnet rotors are arranged at intervals, the number of poles is 2n, n is a natural number, and the 2n is more than 30, an A-phase double-layer stator winding, a B-phase double-layer stator winding and a C-phase double-layer stator winding are arranged in 6n+3 grooves of the stators outside the rotors; the total thickness of the rotors and the stators of the motor in the radial direction of the motor are low, the motor is shaped like a thin wall cylinder, and the inner parts such as fan blades, water wheels and the like can be arranged in the rotor yoke, so that the mounting space is saved, and the system efficiency is improved. The cogging torque of the motor is small, the torque pulsation is low, the noise is low, the starting torque is large, the running is stable, and the efficiency is high.

Description

A kind of thin-walled cartridge type permanent-magnet brushless DC electric machine of Low gullet torque
Technical field
The present invention relates to a kind of thin-walled cartridge type permanent-magnet brushless DC electric machine of Low gullet torque, belong to specific type of electric machine technical field of electric appliances.
Background technology
Permanent-magnet brushless DC electric machine has the advantages that good speed adjustment features, operation peace and quiet, efficiency high, is ideal direct-current driving device.At present, the permanent-magnet brushless DC electric machine for being widely used in the industries such as Aeronautics and Astronautics, household electrical appliances, automobile, petrochemical industry both at home and abroad is all solid construction, and its motor internal can not install the miscellaneous parts such as fan leaf, water wheels again.As permanent-magnet brushless DC electric machine is in the extensive use of industry-by-industry, some special occasions in motor internal in the urgent need to installing the parts such as some fan leafs.
In prior art, permanent-magnet brushless DC electric machine is widely used in all trades and professions.For example, the Chinese invention patent of bulletin：Brushless DC motor for energy-saving oil extractor 200910030080.4, disclose the brshless DC motor used for oil extractor that a kind of use belt directly drives sucker rod, the outer rotor of stator and Nd-Fe-B magnet steel as a result of multistage magnetic circuit, has reached the purpose of low speed, high-torque；The Chinese invention patent of mandate：Brushless three-phase synchronous generator for ship fractional-slot winding ZL200910115721.6, disclose a kind of brushless three-phase synchronous generator for ship fractional-slot winding, it is characterized in that by the groove of number of stator slots 108, the pole of number of poles 8, the phase of the number of phases 3, parallel branch number is 4, and coil pitch is 11；The Chinese invention patent of mandate：The fractional-slot winding ZL200510093634.7 of low speed large torque moment permanent-magnet brushless motor, relate to number of magnetic poles P and iron core slot number Z and number of phases M and distribution number Q and meets following condition permanent magnetic brushless：1) when distribution number Q is odd number, iron core slot number Z=Q × M × K, number of magnetic poles P=Z ± K；Wherein K is natural number；2) when distribution number Q is even number, iron core slot number Z=Q × M × K, number of magnetic poles P=Z ± 2K；Wherein K is natural number.The Chinese invention patent of bulletin：The p-m rotor of brshless DC motor, application number：201110025118.6 there is provided a kind of rotor yoke sagittal plane direction of the cross-sectional area along from from two ends to correspondence being bordered by of adjacent magnets gradually increased p-m rotor.Above invention is all the innovation in the permanent-magnet brushless DC electric machine concrete structure of a certain extraordinary applications.
The content of the invention
The present invention provides a kind of thin-walled cartridge type permanent-magnet brushless DC electric machine of Low gullet torque, the critical pieces such as its stator, rotor are all concentrated on the outside of motor, its motor internal is that hollow-core construction is easily installed the miscellaneous parts such as fan leaf, water wheels, and the cogging torque of motor is reduced using fractional-slot winding technology and preferably teeth groove matching, and starting torque is big, operate steadily, efficiency high.
The present invention adopts the following technical scheme that to solve its technical problem：
A kind of thin-walled cartridge type permanent-magnet brushless DC electric machine of Low gullet torque, including guide ring, stator, axle, bearing, support and by rotor yoke, the rotor of magnetic pole and internal part composition, electric machine support fixes motor stator and axle, there is the threephase stator winding using double-deck winding coiling in the groove of stator, rotor is mounted on an axle by bearing, rotor is located at the inner side of stator and has certain interval between stator, the gross thickness of rotor and stator in motor radially is smaller, motor is into thin wall cylinder shape, the outboard bonds of rotor yoke have rare earth permanent magnet magnetic pole, fan leaf is installed inside rotor yoke or water wheels are used as internal part；The side of motor is provided with the guide ring for covering rotor yoke, magnetic pole and threephase stator winding, and guide ring is fixed on stator；It is characterized in that：Number of poles is that 2n, n are natural number and 2n>The n N poles and n S poles of 30 rotor are spaced, there is A in 6n+3 groove of the stator of rotor exterior, B, C threephase stator windings, threephase stator winding Y-connection, there is etc. 2n+1 coil of the number of turn per phase winding, winding pitch is 3, i.e. number of this motor per phase winding coil is 1 more than the common number per extremely per the every phase coil for the common electric machine that phase winding coil is 1, the coil that A phases have more will repeat the winding of the 1st groove and the 4th groove in the 2nd groove and the 5th groove, the coil that B phases have more will repeat the winding of 4n+3 grooves and 4n+6 grooves in 4n+4 grooves and 4n+7 grooves, the coil that C phases have more will repeat the winding of 2n+2 grooves and 2n+5 grooves in 2n+3 grooves and 2n+6 grooves；A phase windings when running into the 4n+4 grooves of B phase winding lap wounds also by one groove of multispan, around also needing one groove of multispan when running into C phase lap wounds since 4n+5 grooves；Similarly, B phases, C phase windings are also such when running into other phase lap wounds.
Beneficial effects of the present invention are as follows：
After the DC motor rotor rotation of the device, directly acting can be rotated by the internal part such as the fan leaf of rotor driven, water wheels, so eliminate the mechanical driving part of original motor and internal part, enormously simplify system architecture, installing space is saved, system effectiveness is improved.Motor cogging torque is small, torque pulsation is small, noise is low, starting torque is big, operate steadily, efficiency high.
Brief description of the drawings
Fig. 1 is the direct current generator cross section view of the present invention, wherein：1st, magnetic pole；2nd, stator；3rd, rotor yoke；4th, internal part.
Fig. 2 is the left view of cross section view shown in Fig. 1, wherein：1st, magnetic pole；3rd, rotor yoke；4th, internal part；5th, three-phase double layered stator winding；6th, guide ring；7th, support；8th, bearing；9th, axle.
Fig. 3 is the motor wire-inserting figure of the embodiment of the present invention.
Embodiment
The invention is described in further details below in conjunction with the accompanying drawings.
The thin-walled cartridge type permanent-magnet brushless DC electric machine of Low gullet torque as depicted in figs. 1 and 2, the motor includes guide ring 6, stator 2, axle 9, bearing 8, support 7 and the rotor being made up of rotor yoke 3, magnetic pole 1 and internal part 4, motor support frame fixes motor stator 2 and axle 9, and rotor is arranged on axle 9 by bearing 8.Number of poles is spaced for the 17 N poles and 17 S poles of 34 p-m rotor, permanent-magnet material is rare earth permanent-magnetic material, because motor pole number is more, so the magnetic flux per pole is smaller, rotor and stator yoke thickness can be smaller, the gross thickness of rotor and stator 2 in motor radially is so reduced, makes motor formation thin-walled core structure.Internal rotor space mounting has fan leaf or water wheels.Motor is provided with the guide ring 6 for covering rotor yoke 3 and magnetic pole 1 in the side that air, water or other fluid enter, hard thing is set to hardly enter the gap between stator 2, rotor, entering the gap between stator 2, rotor even if the object for having softness can also be washed away by air, water or other fluid, it so can effectively prevent foreign matter from entering the gap between motor stator 2, rotor and stopping up motor, improve the reliability of system.
Stator built-in line figure 35 coils of the number of turn such as has, winding pitch is that the coil of 3, A phase windings is respectively as shown in figure 3, there is A, B, C three-phase double layered stator winding 5 in 105 grooves of the stator of rotor exterior per phase winding
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, the coil of B phase windings is respectively
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, the coil of C phase windings is respectively
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, three-phase windings Y-connection.
There is no common divisor between the motor pole number 34 and slot number 105 of embodiment, therefore motor has less harmonic component and cogging torque.
Its operation principle is：The thin-walled cartridge type permanent-magnet brushless DC electric machine operation principle of the Low gullet torque of the present invention and the operation principle of common permanent-magnet brushless DC electric machine are substantially similar, all it is to detect motor position signal using Hall sensor, and rotor is rotated by controller control commutation.

Claims (1)

1. a kind of thin-walled cartridge type permanent-magnet brushless DC electric machine of Low gullet torque, including guide ring (6), stator (2), axle (9), bearing (8), support (7) and the rotor being made up of rotor yoke (3), magnetic pole (1) and internal part (4), electric machine support（7）Fixed motor stator (2) and axle (9), there is the threephase stator winding (5) using double-deck winding coiling in the groove of stator (2), rotor is arranged on axle (9) by bearing (8), rotor is located at the inner side of stator (2) and has certain interval between stator (2), the gross thickness of rotor and stator (2) in motor radially is smaller, motor is into thin wall cylinder shape, rotor yoke（3）Outboard bonds have rare earth permanent magnet magnetic pole (1), rotor yoke（3）Fan leaf is installed in inside or water wheels are used as internal part（4）；The side of motor is provided with the guide ring (6) for covering rotor yoke (3), magnetic pole (1) and threephase stator winding (5), and guide ring (6) is fixed on stator (2)；It is characterized in that：Number of poles is that 2n, n are natural number and 2n>The n N poles and n S poles of 30 rotor are spaced, there is A in 6n+3 groove of the stator (2) of rotor exterior, B, C threephase stators winding (5), threephase stator winding (5) Y-connection, there is etc. 2n+1 coil of the number of turn per phase winding, winding pitch is 3, i.e. number of this motor per phase winding coil is 1 more than the common number per extremely per the every phase coil for the common electric machine that phase winding coil is 1, the coil that A phases have more will repeat the winding of the 1st groove and the 4th groove in the 2nd groove and the 5th groove, the coil that B phases have more will repeat the winding of 4n+3 grooves and 4n+6 grooves in 4n+4 grooves and 4n+7 grooves, the coil that C phases have more will repeat the winding of 2n+2 grooves and 2n+5 grooves in 2n+3 grooves and 2n+6 grooves；A phase windings when running into the 4n+4 grooves of B phase winding lap wounds also by one groove of multispan, around also needing one groove of multispan when running into C phase lap wounds since 4n+5 grooves；Similarly, B phases, C phase windings are also such when running into other phase lap wounds.
CN 201210051195 2012-03-01 2012-03-01 Thin-wall-cylinder type permanent magnet brushless direct-current motor with low cogging torque Expired - Fee Related CN102594069B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106130199A (en) * 2016-05-31 2016-11-16 辽宁通用航空研究院 New iron-based non-crystaline amorphous metal aircraft permanent magnet synchronous motor and control system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201130878Y (en) * 2007-03-27 2008-10-08 陈国弟 Novel vehicle permanent magnet generator
US20100148624A1 (en) * 2008-12-15 2010-06-17 Lg Electronics Inc. Interior permanent magnet type brushless direct current motor
CN101795040A (en) * 2009-12-22 2010-08-04 上海强辉电机有限公司 Overall salient type intermediate-frequency brushless excitation synchronous generator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201130878Y (en) * 2007-03-27 2008-10-08 陈国弟 Novel vehicle permanent magnet generator
US20100148624A1 (en) * 2008-12-15 2010-06-17 Lg Electronics Inc. Interior permanent magnet type brushless direct current motor
CN101795040A (en) * 2009-12-22 2010-08-04 上海强辉电机有限公司 Overall salient type intermediate-frequency brushless excitation synchronous generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106130199A (en) * 2016-05-31 2016-11-16 辽宁通用航空研究院 New iron-based non-crystaline amorphous metal aircraft permanent magnet synchronous motor and control system

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