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CN1567678A - Motor using local magnetic saturation effect of stator to improve starting dead point - Google Patents

Motor using local magnetic saturation effect of stator to improve starting dead point Download PDF

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Publication number
CN1567678A
CN1567678A CN 03147947 CN03147947A CN1567678A CN 1567678 A CN1567678 A CN 1567678A CN 03147947 CN03147947 CN 03147947 CN 03147947 A CN03147947 A CN 03147947A CN 1567678 A CN1567678 A CN 1567678A
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China
Prior art keywords
stator
magnetic pole
sides
respect
center line
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Application number
CN 03147947
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Chinese (zh)
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CN1306678C (en
Inventor
洪银树
蔡明祺
许良伊
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Sunonwealth Electric Machine Industry Co Ltd
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Sunonwealth Electric Machine Industry Co Ltd
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Priority to CNB031479472A priority Critical patent/CN1306678C/en
Publication of CN1567678A publication Critical patent/CN1567678A/en
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Publication of CN1306678C publication Critical patent/CN1306678C/en
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Abstract

The invention discloses a motor of using stator partial magnetic saturation to improve startup dead spot, composed of a rotor with permanent magnet and a stator with silicon steel sheet winding, where the pole edge at the magnetic pole of silicon steel sheet gear slot and the rotor permanent magnet keep equal air gap between them, and the magnetic poles are designed nonsymmetrically relative to the blocks on two sides of its centre line. The invention uses the nonsymmetrical design of the stator magnetic poles to cause partial magnetic saturation in the magnetic poles, making the air gap flux density distribution nonuniform and generating nonsymmetrical magnetic linkage waveform, and then changing the distribution of output torsion waveform of the motor, and thus improving startup dead spot.

Description

Utilize the local magnetic saturation effect of stator to improve the motor that starts the dead point
Technical field
The present invention relates to a kind of local magnetic saturation effect of stator that utilizes and improve the motor that starts the dead point, more particularly, relate to a kind ofly, improve the motor that starts the dead point and can reach equating gas length and not having under the prerequisite that changes magnetic pole of the stator utmost point edge.
Background technology
Known now permanent magnetic brushless motor be in the unit interval only one group of coil of conducting to produce magnetic force, utilize the suction of magnetic force to scold principle to drive the rotor running again, it mainly includes a stator and reaches in scheduling inboard or outside rotor, wherein stator is wound with coil respectively in each magnetic pole place, and maintain the air gap of a suitable length between the permanent magnet of the utmost point edge of magnetic pole and rotor, the magnetic field that produces by the stator coil energising and the interaction of rotor permanent magnet drive rotor rotation.
This permanent magnetic brushless motor is when practical operation, have the problem that starts the dead point, as shown in Figure 9, the figure shows the torque (CW) of permanent magnetic brushless motor and the relation at rotary machine angle (θ), the excitatory torque curve of this motor is a, will be in the position of point of safes p when motor is static, and when motor input exciting curent starts running, excitatory torque is zero (the p point of a curve), and therefore, permanent magnetic brushless motor exists can't start the problem of running smoothly because of friction load causes motor.Though, the startup dead unit problem that exists for aforementioned permanent magnetic brushless motor can solve by the conduction mode of using many group coils instead, but based on cost consideration, for some system, utilize the motor of many group coils conducting and do not meet economic benefit, therefore, under the prerequisite that does not change the coil conducting, have only by changing the magnetic structure of motor, effectively to address this problem.
For this reason at United States Patent (USP) the 5th, 250, a brushless motor is disclosed in No. 867 " PERMANENT MAGNET BRUSHLESS DC MOTERHAVING REDUCED COGGING ", this brushless motor mainly is the perforation that is provided with symmetry at the magnetic pole two ends of stator silicon steel sheet, forms recess with the solution conventional motor on magnetic pole of the stator utmost point edge and causes the little problem of magnetic flux air gap area.
Though the brushless motor in this United States Patent (USP) utilizes the perforation that is provided with at stator silicon steel sheet magnetic pole two ends to improve conventional motor and establish the problem that recess causes the magnetic flux air gap area to dwindle on utmost point edge, yet, this motor stator is provided with the magnetic pole of perforation still owing to take symmetric design, and after being applied on the motor, motor will be parked on the point of safes position when static, when motor input exciting curent starts running, because of excitatory torque also is zero, so motor still has the problem that starts the dead point under friction load, be not easy to successfully start running.
For this reason, there is the problem that starts the dead point in creator among the present invention in order to solve aforementioned permanent magnetic brushless motor, and through concentrating on studies and developing, create a kind of local magnetic saturation effect of stator that utilizes eventually and improve the motor that starts the dead point, promptly by means of the change of magnetic pole of the stator, and under the condition that does not change gas length and magnetic pole utmost point edge, cause the asymmetric magnetic circuit of motor, and then change the waveform of exporting distribution of torque, reaching motor does not have the effect that starts the dead point.
Summary of the invention
The main purpose of utilizing the local magnetic saturation effect of stator to improve the motor that starts the dead point among the present invention is to solve existing permanent magnetic brushless motor and has the problem that starts the dead point.
Utilize the local magnetic saturation effect of stator to improve the motor that starts the dead point among the present invention and can be coil radially outward rotation type, the interior rotatable motor of winding radial air gap, also can be the motor of coil axes to the winding radial air gap, this motor has the stator pack of coil to constitute by rotor with permanent magnet and silicon steel sheet winding, wherein maintain the gas length of same fixed between the utmost point edge of stator silicon steel sheet magnetic pole end and permanent magnet, and the magnetic pole of stator is the asymmetric shape that magnetic flux can be offset with respect to the block design of its center line both sides.
In addition, described magnetic pole is identical with respect to the block profile of its center line both sides, and is provided with the hole of at least more than one arbitrary shape in adjacent poles edge place in the block of disalignment one side, so that magnetic pole is asymmetric shape with respect to its center line both sides.
In addition, described magnetic pole is inequality with respect to the block profile of its center line both sides, so that magnetic pole is asymmetric shape with respect to the center line both sides.
In addition, described magnetic pole is inequality with respect to the block profile of its center line both sides, and is provided with at least more than one arbitrary shape hole in the less block of disalignment area in adjacent poles edge place, so that magnetic pole is asymmetric shape with respect to the center line both sides.
Utilize the local magnetic saturation effect of stator to improve the motor at startup dead point under the prerequisite that does not change gas length or utmost point edge utmost point edge among the present invention, by magnetically saturated distribution is planned, utilize magnetic pole of the stator to form the locality magnetic saturation, cause the air gap flux density skewness, produce asymmetrical magnetic interlinkage waveform, and then change motor start and stop torque distributed wave, utilizing start and stop torque to make motor still have extra moment of torsion output when excitatory torque is zero, also is that total output torque (excitatory torque+start and stop torque) of motor is all non-vanishing at any mechanical location.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment among the present invention is described in further detail.
Fig. 1 is the coil floor map of the outward rotation type motor of winding radial air gap radially among the present invention;
Fig. 2 is the coil floor map of the interior rotatable motor of winding radial air gap radially among the present invention;
Fig. 3 is the floor map of stator embodiment one among the present invention;
Fig. 4 is the floor map of stator embodiment two among the present invention;
Fig. 5 is the floor map of stator embodiment three among the present invention;
Fig. 6 is the torque (CW) of motor among the present invention and the graph of a relation at rotary machine angle (θ);
Fig. 7 is the schematic top plan view of the motor of the axial winding radial air gap of coil among the present invention;
Fig. 8 is the side-looking floor map of the motor of the axial winding radial air gap of coil among the present invention;
Fig. 9 is the torque (CW) of conventional permanent magnet brushless motor and the graph of a relation at rotary machine angle (θ).
Embodiment
The present invention can be applicable to the coil radially outward rotation type or the inward rotation type permanent magnet brushless motor of winding radial air gap, or can be applicable to the permanent magnetic brushless motor of coil axes to the winding radial air gap, as shown in Figure 1, coil is the outward rotation type motor of the winding radial air gap stator 20 that includes a hollow rotor 10 and be installed in rotor 10 inside radially, rotor 10 is equiped with several different magnetic poles and permanent magnet alternately 13 on the madial wall of a hollow yoke 11, the central authorities of rotor 10 are provided with an axle center 14, stator 20 has silicon steel sheet 21, the central authorities of this silicon steel sheet 21 and axle center 14 are pivoted, silicon steel sheet 21 peripheries have several extensions that is radial extension 23, the end of each extension 23 has magnetic pole 24, the outer rim of magnetic pole 24 forms the outer salient pole edge 241 in respective rotor 10 accommodation space arcs footpath, and 13 of permanent magnets in utmost point edge 241 and rotor 10 maintain certain gas length, on each extension 23 respectively winding coil 25 is arranged, magnetic pole 24 is asymmetric kenel with respect to center line 242 both sides, makes its magnetic flux produce skew.
As shown in Figure 2, coil is the interior rotatable motor of the winding radial air gap stator 20 that includes a rotor 10 and be sheathed on rotor 10 outsides radially, rotor 10 is provided with axle center 14 in the centre of its hollow yoke 11, and 14 outer ring is provided with several different magnetic poles and permanent magnet alternately 13 in the axle center, stator 20 is placed in has a ring-type silicon steel sheet 21 that can be sheathed on rotor 10 outsides, this silicon steel sheet 21 sidewall within it is extended with several extensions that is radial arrangement 23 towards axis direction, the end of each extension 23 has magnetic pole 24, the end of this magnetic pole 24 forms the indent utmost point edge 241 in respective rotor 10 outer peripheral edges arcs footpath, and 13 of permanent magnets in utmost point edge 241 and rotor 10 maintain certain gas length, on each extension 23 respectively winding coil 25 is arranged, magnetic pole 24 is asymmetric kenel with respect to the both sides of center line 242, makes magnetic flux produce skew.
In aforementioned in stator 20 silicon steel sheets 21 of rotatable or outward rotation type motor, magnetic pole 24 is asymmetric kenel with respect to the both sides of center line 242, the mode that makes magnetic flux produce skew can be realized by following several means, wherein: as shown in Figure 3, magnetic pole 24 is with respect to the block 243 of center line 242 both sides, 244 profiles are identical, and the block 244 in disalignment 242 1 sides is provided with at least more than one hole 245 at adjacent poles edge 241 places, this hole 245 can be circle, oval, square, polygon ... or any hole shape of other geometries, so that magnetic pole 24 is asymmetric kenel with respect to center line 242 both sides.
As shown in Figure 4, magnetic pole 24 also can not change under utmost point edge 241 shapes of original concave or convex, and the profile with respect to the block 243,244 of center line 242 both sides is not waited, and makes magnetic pole 24 be asymmetric shape with respect to center line 242 both sides.
As shown in Figure 5, magnetic pole 24 does not wait with respect to block 243,244 profiles of center line 242 both sides, and the area in disalignment 242 is provided with at least more than one hole 245 than block of cells 244 at adjacent poles edge 241 places, hole 245 can be circle, ellipse, square, polygon ... or any hole shape of other geometries, make magnetic pole 24 be asymmetric kenel with respect to center line 242 both sides blocks 243,244.
Permanent magnetic brushless motor among the present invention is after previous designs, its characteristics are: stator 20 is in the gas length that does not change 13 of magnetic pole 24 and permanent magnets or do not change under the prerequisite of utmost point edge 241, by suitable magnetic saturation distribution planning, make magnetic pole of the stator 24 form the locality magnetic saturation, cause the air gap flux density skewness, produce asymmetrical magnetic interlinkage waveform, as shown in Figure 6, torque (CW) by motor can be understood with the relation at rotary machine angle (θ), the excitatory torque curve of motor is A, the start and stop torque curve is B, and the total torque curve after synthetic is C, therefore, the present invention pauses by the change motor and changes the means that bashful rectangular waveform distributes, the total output torque (excitatory torque+start and stop torque) that reaches motor is in that mechanical location is all non-vanishing arbitrarily, makes under the existing framework of permanent magnetic brushless motor among the present invention, effectively overcome the startup dead unit problem.
As shown in Figure 7 and Figure 8, the present invention is applied to coil axes when the permanent magnetic brushless motor of winding radial air gap, and this motor comprises a hollow rotor 30 and the stator 40 that is installed in rotor 30 inside.Rotor 30 is established an axle center 34 in its hollow yoke 31, and on yoke 31 madial walls, establish several different magnetic poles and permanent magnet alternately 33, stator 40 has an axle center bar 42 upper and lower sides and respectively establishes the stator core 41 that silicon steel sheet 43 constitutes, coil 44 windings on the axle center bar 42 between between the silicon steel sheet 43 up and down, these silicon steel sheet 43 peripheries have several extensions that is radial extension 431, each extension 431 end has magnetic pole 432, these magnetic pole 432 outside lines form the outer salient pole edge 433 in respective rotor inner arc footpath, and utmost point edge 433 keeps certain gas length with the permanent magnet 33 of rotor 30, the magnetic pole 432 of silicon steel sheet 43 is alternately up and down, the magnetic pole 432 of stator 40 is with respect to center line 434 both sides blocks 435,436 is asymmetric kenel, make magnetic flux produce skew, also can reach the function that overcomes the motor starting dead point.
The magnetic pole 432 of stator former 40 utilizes with respect to 435, the 436 asymmetric designs of center line 434 both sides blocks, and make magnetic flux produce offset manner and be same as radially winding embodiment of aforementioned coil, wherein:
Magnetic pole is identical with respect to the block profile of its center line both sides, and the block adjacent poles edge place in disalignment one side is provided with at least more than one hole, this hole can be circle, ellipse, square, polygon ... or the hole shape of other geometries, make magnetic pole be asymmetric kenel with respect to the block of its center line both sides, this magnetic pole is kept original outer salient pole edge shape, this magnetic pole does not wait with respect to the block profile of its center line both sides, makes this magnetic pole be asymmetric shape with respect to its center line both sides.
In addition, magnetic pole does not wait with respect to the block profile of its center line both sides, and the area in disalignment is provided with at least more than one hole than block of cells adjacent poles edge place, this hole can be circle, ellipse, square, polygon ... or any hole shape of other geometries makes this magnetic pole be asymmetric kenel with respect to its center line both sides.
After above stated specification, can clearly understand the present invention provides a kind of motor with certain novelty and tool industrial utilization really.
In addition; though more than the preferred embodiment among the present invention is described; but can not be as protection scope of the present invention; promptly should be understood that to those skilled in the art; do not breaking away from variation and the modification that to make equivalence under the design spirit of the present invention to it; therefore, every not breaking away from the equivalence variation of having done under the design spirit of the present invention and modification, all should think to fall into protection scope of the present invention.

Claims (12)

1. one kind is utilized the local magnetic saturation effect of stator to improve the motor that starts the dead point, include the rotor of a hollow and be located at the interior stator of rotor, this rotor is provided with different magnetic poles and permanent magnet alternately in the madial wall of its hollow yoke, and be provided with the axle center in central authorities, this axle center is hubbed at the silicon steel sheet central authorities of stator, this stator core periphery is the radial extension that several ends are provided with magnetic pole that is extended with, this magnetic pole outer rim forms the outer salient pole edge in respective rotor yoke inside arc footpath, between utmost point edge and permanent magnet, maintain certain gas length, and be wound with coil on each extension, it is characterized in that: the magnetic pole of described stator is with respect to its center line both sides block can make magnetic meet the asymmetric shape that skew takes place.
2. improve the motor that starts the dead point according to the local magnetic saturation effect of stator that utilizes described in the claim 1, it is characterized in that: described magnetic pole is identical with respect to the block profile of its center line both sides, and be provided with at least more than one hole in adjacent poles edge place in the block of disalignment one side, make magnetic pole be asymmetric shape with respect to the center line both sides.
3. improve the motor that starts the dead point according to the local magnetic saturation effect of stator that utilizes described in the claim 1, it is characterized in that: described magnetic pole does not wait with respect to the block profile of its center line both sides, makes magnetic pole be asymmetric shape with respect to the center line both sides.
4. improve the motor that starts the dead point according to the local magnetic saturation effect of stator that utilizes described in the claim 1, it is characterized in that: described magnetic pole does not wait with respect to the block profile of its center line both sides, and the block less in the disalignment area is provided with at least more than one hole in adjacent poles edge place, makes magnetic pole be asymmetric shape with respect to its center line both sides.
5. one kind is utilized the local magnetic saturation effect of stator to improve the motor that starts the dead point, it includes a rotor and is sheathed on the stator in the rotor outside, this rotor is provided with the axle center in the middle of its yoke, the yoke lateral wall is provided with several different magnetic poles and permanent magnet alternately, stator provides rotor with its ring-type silicon steel sheet and is pivoted wherein, the end of inboard several radial arrangement of this silicon steel sheet has the extension of magnetic pole, the terminal indent utmost point edge that forms respective rotor outer peripheral edges arc footpath of this magnetic pole, maintain certain gas length between utmost point edge and permanent magnet, on each extension respectively winding coil is arranged, it is characterized in that: the magnetic pole of described stator forms the asymmetric shape that can make the magnetic flux skew with respect to its center line both sides block.
6. improve the motor that starts the dead point according to the local magnetic saturation effect of stator that utilizes described in the claim 5, it is characterized in that: described magnetic pole is identical with respect to the block profile of its center line both sides, and the block in disalignment one side is provided with at least more than one hole in adjacent poles edge place, makes magnetic pole be asymmetric shape with respect to its center line both sides.
7. improve the motor that starts the dead point according to the local magnetic saturation effect of stator that utilizes described in the claim 5, it is characterized in that: described magnetic pole does not wait with respect to the block profile of its center line both sides, makes this magnetic pole be asymmetric shape with respect to its center line both sides.
8. improve the motor that starts the dead point according to the local magnetic saturation effect of stator that utilizes described in the claim 5, it is characterized in that: described magnetic pole does not wait with respect to the block profile of center line both sides, and the block less in the disalignment area is provided with at least more than one hole in adjacent poles edge place, makes magnetic pole be asymmetric shape with respect to the center line both sides.
9. one kind is utilized the local magnetic saturation effect of stator to improve the motor that starts the dead point, it includes a hollow rotor and is located at the interior stator of rotor, rotor is provided with the axle center in its hollow yoke central authorities, and on the yoke madial wall, establish several different magnetic poles and permanent magnet alternately, stator has an axle center bar, this axle center bar upper and lower side is provided with silicon steel sheet and constitutes stator core, coil windings on the bar of axle center between between the silicon steel sheet up and down, the extension end of the radial extension of this silicon steel sheet periphery has several magnetic poles, keep certain gas length between the utmost point edge of this magnetic pole outer rim and permanent magnet, the magnetic pole of silicon steel sheet is shape alternately up and down, it is characterized in that: this magnetic pole of the stator forms the asymmetric shape that makes the magnetic flux skew with respect to the block of its center line both sides.
10. improve the motor that starts the dead point according to the local magnetic saturation effect of stator that utilizes described in the claim 9, it is characterized in that: described magnetic pole is identical with respect to the block profile of its center line both sides, and the block in disalignment one side is provided with at least more than one hole in adjacent poles edge place, makes magnetic pole be asymmetric shape with respect to its center line both sides.
11. improve the motor that starts the dead point according to the local magnetic saturation effect of stator that utilizes described in the claim 9, it is characterized in that: described magnetic pole does not wait with respect to the block profile of its center line both sides, makes this magnetic pole be asymmetric shape with respect to its center line both sides.
12. according to utilizing the local magnetic saturation effect of stator to improve the motor that starts the dead point described in the claim 9, it is characterized in that: described magnetic pole does not wait with respect to the block profile of its center line both sides, and the block adjacent poles edge place less in the disalignment area is provided with at least more than one hole, makes magnetic pole be asymmetric shape with respect to its center line both sides.
CNB031479472A 2003-06-26 2003-06-26 Motor using local magnetic saturation effect of stator to improve starting dead point Expired - Fee Related CN1306678C (en)

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CNB031479472A CN1306678C (en) 2003-06-26 2003-06-26 Motor using local magnetic saturation effect of stator to improve starting dead point

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CNB031479472A CN1306678C (en) 2003-06-26 2003-06-26 Motor using local magnetic saturation effect of stator to improve starting dead point

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CN1567678A true CN1567678A (en) 2005-01-19
CN1306678C CN1306678C (en) 2007-03-21

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI410041B (en) * 2009-01-09 2013-09-21 Foxnum Technology Co Ltd System and method for compensating cogging torque of motor
CN106816969A (en) * 2015-11-27 2017-06-09 博世电动工具(中国)有限公司 Motor stator, motor and electric tool
CN106953442A (en) * 2017-03-27 2017-07-14 广东美芝精密制造有限公司 Rotor, motor and its compressor of permagnetic synchronous motor
CN111725926A (en) * 2020-08-04 2020-09-29 珠海格力电器股份有限公司 Single-phase permanent magnet self-starting motor and electric equipment with same
TWI822102B (en) * 2022-06-09 2023-11-11 國立高雄科技大學 Radial flux switching motor and its rotor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0823646A (en) * 1994-07-04 1996-01-23 Mitsubishi Heavy Ind Ltd Stator for rotating electric machine
KR20010057863A (en) * 1999-12-23 2001-07-05 이형도 A brushless motor of single phase
CN100468925C (en) * 2001-07-25 2009-03-11 台达电子工业股份有限公司 Miniature motor with low start and stop torque
US6566784B1 (en) * 2002-05-16 2003-05-20 Chun-Pu Hsu Stator structure with single-arm tooth holders

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI410041B (en) * 2009-01-09 2013-09-21 Foxnum Technology Co Ltd System and method for compensating cogging torque of motor
CN106816969A (en) * 2015-11-27 2017-06-09 博世电动工具(中国)有限公司 Motor stator, motor and electric tool
CN106816969B (en) * 2015-11-27 2020-07-10 博世电动工具(中国)有限公司 Motor stator, motor and electric tool
CN106953442A (en) * 2017-03-27 2017-07-14 广东美芝精密制造有限公司 Rotor, motor and its compressor of permagnetic synchronous motor
CN111725926A (en) * 2020-08-04 2020-09-29 珠海格力电器股份有限公司 Single-phase permanent magnet self-starting motor and electric equipment with same
TWI822102B (en) * 2022-06-09 2023-11-11 國立高雄科技大學 Radial flux switching motor and its rotor

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Address after: The new Taiwan China Ya Lu Kaohsiung City No. 30 Lane 296

Patentee after: Sunonwealth Electric Machine Industry Co.,Ltd.

Address before: Kaohsiung City, Taiwan, China

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Granted publication date: 20070321