WO2008059736A1 - Moteur sans balai - Google Patents

Moteur sans balai Download PDF

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Publication number
WO2008059736A1
WO2008059736A1 PCT/JP2007/071609 JP2007071609W WO2008059736A1 WO 2008059736 A1 WO2008059736 A1 WO 2008059736A1 JP 2007071609 W JP2007071609 W JP 2007071609W WO 2008059736 A1 WO2008059736 A1 WO 2008059736A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
resolver
resolver rotor
magnet
brushless motor
Prior art date
Application number
PCT/JP2007/071609
Other languages
English (en)
Japanese (ja)
Inventor
Tatsuya Sato
Eiichi Machida
Yoshihiro Nishimura
Atsushi Okamoto
Hirotatsu Ikeno
Yoshihisa Haruishi
Original Assignee
Mitsuba Corporation
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 Mitsuba Corporation filed Critical Mitsuba Corporation
Priority to JP2008544110A priority Critical patent/JP5059021B2/ja
Publication of WO2008059736A1 publication Critical patent/WO2008059736A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0421—Electric motor acting on or near steering gear
    • B62D5/0424—Electric motor acting on or near steering gear the axes of motor and final driven element of steering gear, e.g. rack, being parallel
    • B62D5/0427—Electric motor acting on or near steering gear the axes of motor and final driven element of steering gear, e.g. rack, being parallel the axes being coaxial
    • 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
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/12—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using detecting coils using the machine windings as detecting coil

Definitions

  • the present invention relates to a brushless motor used in an electric power steering apparatus and the like, and more particularly to a structure of a magnet holder that holds a rotor magnet.
  • FIG. 7 is an explanatory diagram showing a schematic configuration of a rack shaft type EPS motor.
  • the magnet 101 is attached to a rotor core 103 that is press-fitted and fixed to the shaft 102.
  • a magnet holder 104 is fixed to the rotor core 103.
  • the magnet 101 is held and fixed to the outer peripheral surface of the rotor core 103 by the magnet holder 104.
  • the resolver rotor 105 is usually fixed to the shaft 102.
  • Spacers 106 and 107 are disposed on both sides of the resolver rotor 105 in the axial direction to prevent the resolver rotor 105 from coming off in the axial direction.
  • Each spacer 106, 107 is fixed to the shaft 102.
  • the resolver rotor 105 is prevented from coming off in the axial direction by the spacers 10 6 and 107.
  • Positioning of the resolver rotor in the rotational direction is performed by providing positioning indexes P on the shaft 102, the spacer 106, and the resolver rotor 105, and combining them. That is, first, the spacer 106 is press-fitted into the shaft 102 while matching the indices P with each other. Next, the spacer 106 and the index P of the resolver rotor 105 are aligned, and the resolver rotor 105 is bonded and fixed to the shaft 102. Further, a spacer 107 is press-fitted into the shaft 102, and the resolver rotor 105 is sandwiched between the spacers 106 and 107 to prevent axial removal.
  • the positioning index P provided on the shaft 102 indicates the reference position of the rotor. Therefore, with this index P as a reference, the rotor core 103 is fixed to the shaft 102 and the magnet holder 104 is fixed to the rotor core 103. Further, the positioning index P of the resolver rotor 105 also indicates the reference position as a single resolver. Therefore, by attaching the magnet holder 104 to the resolver rotor 105 so as to match the index P, the magnet 101 held and fixed to the magnet holder 104 and the resolver rotor 105 are positioned and fixed in a predetermined angular positional relationship. As a result, the magnetic circuit of the motor unit and the resolver are synchronized, and the rotor rotational position using the resonance lever can be detected.
  • Patent Document 1 Japanese Patent Laid-Open No. 2006-87277
  • Patent Document 2 JP-A-2005-20887 Disclosure of the invention
  • An object of the present invention is to improve the positional accuracy between a motor portion and a resolver while reducing the number of parts around the resolver rotor in a brushless motor using a resolver.
  • the brushless motor of the present invention includes a stator core, a stator including a coil wound around the stator core, a rotor shaft that is rotatably arranged with respect to the stator, and a rotor core fixed to the rotor shaft.
  • a resolver including: a rotor provided with a magnet attached to an outer periphery of the rotor core; a resolver rotor attached to the rotor shaft; and a resolver stator disposed outside the resolver rotor; and attached to the rotor And a magnet holder having a magnet holding part for holding and fixing the magnet on the outer periphery of the rotor core, and a resolver rotor connecting part connected to the resolver rotor.
  • a magnet holding part for holding and fixing a magnet to a brushless motor having a stator, a rotor and a resolver, and a resolver port connected to the resolver rotor
  • the magnet and the resolver rotor can be mechanically connected in a predetermined angular positional relationship. For this reason, the positioning accuracy between the magnet and the resolver rotor is improved as compared with the method in which the index is visually adjusted. In addition, since no visual work is required, the assembly workability is improved and the man-hours can be reduced accordingly.
  • a resolver coupling portion that couples the resolver rotor connection portion and the resolver rotor may be provided between the resolver rotor connection portion and the resolver rotor.
  • the resolver coupling portion is provided with a resolver rotor connecting piece formed in the resolver rotor connecting portion and extending in the axial direction, and a fitting portion formed in the resolver rotor and into which the resolver rotor connecting piece is fitted. Also good.
  • the resolver port connecting piece and the magnet are set in a predetermined angular positional relationship, and the fitting portion and the convex portion formed on the outer periphery of the resolver rotor are set in a predetermined angular positional relationship. Also good.
  • a flange portion that abuts the resolver rotor on the rotor shaft and restricts the movement of the resolver rotor in the axial direction may be provided. This prevents the resolver rotor force S flange from coming off and eliminates the need for spacers on the rotor shaft, thereby reducing the number of parts and assembly steps.
  • the resolver rotor connecting portion and the magnet holding portion may be provided so as to be separable.
  • the change can be made only by changing the resolver rotor connecting portion without changing the magnet holding portion.
  • a holder joint portion for joining the resolver rotor connection portion and the magnet holding portion may be provided between the resolver rotor connection portion and the magnet holding portion.
  • the holder joint may be provided with a fitting piece formed in the resolver rotor connecting portion and extending in the axial direction, and a fitting portion formed in the magnet holding and fitted with the fitting piece.
  • the magnet holding portion that holds and fixes the magnet and the resolver rotor are in contact with each other. Since the magnet holder is provided with the connected resolver rotor connection part, the magnet and resolver rotor can be mechanically connected in a predetermined angular positional relationship, and the magnet and resolver rotor can be accurately connected. Can be positioned. In addition, since no visual work is required, the assembly workability is improved, and the man-hours can be reduced correspondingly, and the manufacturing cost can be reduced.
  • the resolver rotor is prevented from coming off by the flange portion, and there is no need to arrange a spacer on the rotor shaft.
  • the number of parts and assembly man-hours can be reduced.
  • the manufacturing cost of the rotor shaft can be reduced.
  • FIG. 1 is a cross-sectional view showing a configuration of a brushless motor that is Embodiment 1 of the present invention.
  • FIG. 2 is a perspective view of a magnet holder.
  • FIG. 3 (a) is a cross-sectional view of the magnetic honoreda along the AA spring in (b), and (b) is a right side view of the magnetic honoreda.
  • FIG. 4 (a) is a side view of the resolver rotor, and (b) is a sectional view thereof.
  • FIG. 5 shows a configuration of a magnet holding portion of a brushless motor that is Embodiment 2 of the present invention, in which (a) is a sectional view thereof and (b) is a side view.
  • FIG. 6 shows a configuration of a magnet holding part of a brushless motor that is Embodiment 2 of the present invention, where (a) is a front view thereof, (b) is a left side view, and (c) is a right side view. is there.
  • FIG. 7 is an explanatory diagram showing a schematic configuration of a rack shaft type EPS motor.
  • FIG. 1 is a cross-sectional view showing a configuration of a brushless motor that is Embodiment 1 of the present invention.
  • the motor 1 shown in FIG. 1 is used as a power source for rack-assisting EPS and has a configuration in which the rack shaft 2 passes through the motor 1.
  • the rotation of the motor 1 is transmitted to the rack shaft 2 via the ball screw mechanism 3 and becomes a steering assist force.
  • the motor 1 has an inner rotor type device configuration in which a stator 11 is disposed outside and a rotor 21 is disposed inside.
  • a resolver 33 is used to detect the rotational position of the rotor 21.
  • Stator 11 includes a housing 12 and a stator core fixed to the inner peripheral side of housing 12
  • the housing 12 is made of iron or the like.
  • An aluminum die-cast housing 41 is attached to the left end of the housing 12 in the figure.
  • the stator core 13 has a structure in which many steel plates are laminated. A plurality of (in this case, nine) teeth are projected from the inner peripheral side of the stator core 13. A coil 14 is wound around a slot (9 slots) formed between the teeth via an insulator 15 made of synthetic resin.
  • Insulators 15 are attached to both ends of the stator core 13.
  • a terminal unit 16 is attached to the left end of the left side (insulator 15a) of the insulator 15 in FIG.
  • the terminal unit 16 has a large number of coil feeding terminals 17 protruding in the radial direction.
  • Each coil feeding terminal 17 is connected to a terminal portion of the coil 14 (a winding start portion or a winding end portion of the coil 14)! Terminal Unit
  • the external connection terminal 18 that is electrically connected to the coil power supply terminal 17 is further provided on the connector 16.
  • a lead wire 19 is connected to the external connection terminal 18.
  • Each coil 14 is appropriately supplied with electric power via a terminal unit 16 from a lead wire 19 connected to an external power source.
  • the rotor 21 is arranged inside the stator 11.
  • the rotor 21 has a configuration in which a cylindrical rotor shaft 22, a rotor core 23, a magnet 24, and a magnet cover 25 are arranged coaxially.
  • a rack shaft 2 is passed through the rotor shaft 22.
  • a cylindrical rotor core 23 is externally mounted on the outer periphery of the rotor shaft 22.
  • a magnet 24 having a 6-pole configuration is held and fixed on the outer periphery of the rotor core 23 by a magnet holder 51 made of synthetic resin.
  • 2 is a perspective view of the magnet holder 51
  • FIG. 3 (a) is a cross-sectional view of the magnet holder 51 along the line AA in FIG. 3 (b)
  • FIG. 2 (b) is a right side view of the magnet holder 51.
  • the magnet holder 51 includes a magnet holding part 52, a rotor shaft fixing part 53, and a resolver rotor connection part 54.
  • the magnet holding part 52 is provided with a base part 55 that is fixed to the rotor shaft 22 together with the rotor shaft fixing part 53, and a holder arm 56 that is formed to project from the base part 55 in the axial direction.
  • the holder arm 56 has a cantilever structure extending in the axial direction from one end side of the base portion 55.
  • the holder arm 56 has a substantially T-shaped cross section. Between the adjacent holder arms 56, the magnet 24 is press-fitted from the axial direction to the free end side of the holder arm 56 (left end side in FIG. 3).
  • the magnet 24 is held and fixed between the outer peripheral surface of the rotor core 23 and the holder arm 56. After the magnet 24 is attached, the magnet cover 25 is externally attached to the outside of the magnet honoreda 51. As a result, the magnet 24 is pressed from the radial direction, and the movement of the magnet 24 in the axial direction is restricted (prevention from coming off).
  • the rotor shaft fixing portion 53 is formed in a cylindrical shape, and is formed integrally with the base portion 55.
  • the inner diameter of the rotor shaft fixing portion 53 is formed slightly smaller than the outer diameter of the rotor shaft 22.
  • the magnet holder 51 is press-fitted and fixed to the outer periphery of the rotor shaft 22 by the rotor shaft fixing portion 53.
  • a resolver rotor connecting piece 57 connected to the resolver rotor 35 of the resolver 33 is provided at the end of the rotor shaft fixing portion 53 (the right end side in FIG. 1 and the upper end side in FIG. 2). Yes.
  • the resolver rotor connecting pieces 57 are formed so as to protrude from the end of the rotor shaft fixing portion 53 in the axial direction, and are formed in three equal portions in the circumferential direction.
  • the resolver rotor connecting piece 57 has a predetermined angular positional relationship with the magnet 24 held and fixed to the magnet holding portion 52.
  • the resolver rotor connecting piece 57 includes a base piece portion 58 projecting from the end surface 53a of the rotor shaft fixing portion 53, and a fitting claw 59 projecting further in the axial direction from the base piece portion 58. Yes.
  • the fitting claw 59 has a smaller circumferential dimension than the base piece 58. Further, a tapered portion 61 is formed at the distal end portion of the fitting claw 59.
  • a housing 31 made of aluminum die casting is attached to the right end side of the housing 12 in the figure.
  • the housing 31 accommodates a bearing 32 that supports the right end side of the rotor 21 and a resolver 33 that detects the rotation of the rotor 21.
  • the resolver 33 includes a resolver stator 34 fixed to the housing 31 side and a resolver rotor 35 fixed to the rotor 21 side.
  • a coil 36 is wound around the resolver stator 34, and an excitation coil and a detection coil are provided.
  • a resolver rotor 35 fixed to the rotor shaft 22 is disposed inside the resolver stator 34.
  • 4A is a side view of the resolver rotor 35
  • FIG. 4B is a cross-sectional view thereof.
  • the resonance lever rotor 35 has a structure in which metal plates are laminated, and convex portions 62 are formed in three directions.
  • the resolver rotor 35 also rotates in the resolver stator 34.
  • the excitation coil of the resolver stator 34 is given a high frequency signal, and the phase of the signal output from the detection coil changes due to the proximity of the convex portion 62.
  • the rotation position of the rotor 21 is detected by comparing this detection signal with the reference signal. Then, based on the rotational position of the rotor 21, the current to the coil 14 is appropriately switched, and the rotor 21 is rotationally driven.
  • the resolver rotor is attached by visual inspection, and a spacer is arranged before and after that to prevent it from falling out. There was also a problem in work efficiency.
  • the resolver coupling portion 63 that couples the magnet holder 51 and the resolver rotor 35 is provided between the magnet holder 51 and the resolver rotor 35 so that the resolver rotor 35 can be positioned with high accuracy.
  • the rotor shaft 22 has a flange portion 64, which does not use a spacer. In addition, the resolver rotor 35 can be prevented from coming off.
  • the resolver rotor 35 is formed with a shaft through hole 65 through which the rotor shaft 22 is passed.
  • a fitting groove (fitting portion) 66 is notched in the shaft through hole 65 along the axial direction.
  • the fitting grooves 66 correspond to the resolver rotor connecting piece 57 and are arranged in three equal places in the circumferential direction.
  • the resolver rotor connecting piece 57 and the fitting groove 66 form a resolver coupling portion 63.
  • the fitting groove 66 is formed so as to have a predetermined angular positional relationship with the convex portion 62 of the resolver rotor 35.
  • the dimension in the circumferential direction of the fitting groove 66 is slightly smaller than the dimension in the circumferential direction of the fitting claw 59, and the fitting claw 59 is attached so as to be lightly press-fitted into the fitting groove 66.
  • a flange portion 64 is formed near the right end of the rotor shaft 22.
  • the flange portion 64 is formed with a larger diameter than other portions of the rotor shaft 22.
  • the resolver rotor 35 is attached to the rotor shaft 22.
  • the resolver rotor 35 is attached in such a manner that the rotor shaft 22 is inserted into the shaft through hole 65 and the resolver rotor 35 is press-fitted into the rotor shaft 22.
  • the resolver rotor 35 is press-fitted to a position where it abuts on the flange portion 64.
  • the magnet holder 51 is press-fitted and fixed to the rotor shaft 22.
  • the fitting claw 59 of the resolver rotor connecting piece 57 is lightly press-fitted into the fitting groove 66 of the resolver rotor 35.
  • the fitting claw 59 has a predetermined angular positional relationship with respect to the magnet 24 held and fixed to the magnet holder 51. Further, the fitting groove 66 has a predetermined angular position relationship with the convex portion 62 of the resolver rotor 35. Therefore, by attaching the fitting claw 59 to the fitting groove 66, the magnet 24 and the resolver rotor 35 are connected in a predetermined angular positional relationship. That is, the positional relationship between the magnet 24 and the resolver rotor 35 is mechanically set by the fitting claw 59 and the fitting groove 66. For this reason, in the motor 1, the positioning accuracy can be dramatically improved as compared with the method in which the index is visually adjusted. No visual work required Therefore, the assembly workability is also improved, and the man-hours can be reduced accordingly.
  • the adjustment angle force S of the resolver stator 34 at the time of final position adjustment of the resolver 33 is reduced, and the resolver 33 Adjustment work becomes easy.
  • the long hole provided for adjusting the resolver can be made small, and the dimensions of the long hole forming bracket and the like can be reduced. Since the bracket for forming the long hole is in a position where it can easily interfere with other parts in the motor, it is preferable that this portion be as small as possible. Therefore, if the circumferential dimension of the long hole is reduced and the bracket is made smaller, a corresponding space will be created, improving the layout in the motor and reducing the overall size of the motor. It becomes possible.
  • the resolver rotor 35 is attached on the rotor shaft 22 so as to be sandwiched between the flange portion 64 and the base piece portion 58 of the resolver rotor connecting piece 57. Therefore, the motor 1 can prevent the resolver rotor 35 from coming off in the axial direction without using a special spacer. For this reason, the number of parts can be reduced as compared with the conventional brushless motor, and the spacer assembly work is not required, so that the productivity can be improved and the cost can be reduced. Furthermore, since the dimensional accuracy of the portion where the spacer of the rotor shaft 22 is fixed is relaxed, the cost can be reduced accordingly.
  • the weight and inertia of the spacer can be reduced, the motor can be reduced in weight, and the control response can be improved. For this reason, the product value as an EPS motor is also improved.
  • the removal of the stopper by the spacer makes it possible to assemble the resolver rotor 35, magnet holder 51, rotor core 23, etc. from the same direction with respect to the rotor shaft 22, which also improves workability. It is done. Since the outer dimension accuracy of the flange portion 64 may be relatively rough, the cost reduction due to the dimensional accuracy relaxation of the spacer fixing portion is greater than the cost increase associated with the formation of the flange portion 64.
  • a housing 41 is attached to the left end side of the housing 12.
  • a ball screw mechanism 3 is incorporated in the housing 41.
  • the ball screw mechanism 3 includes a nut part 42, a screw part 43 formed on the outer periphery of the rack shaft 2, and a large number of balls 44 interposed between the nut part 42 and the screw part 43. ing.
  • the rack shaft 2 is supported so as to reciprocate in the left-right direction by the nut portion 42 in a state where rotation around the shaft is restricted. It moves in the left-right direction with the rotation of.
  • the nut portion 42 is fixed to the left end portion of the rotor shaft 22, and is rotatably held by an angular bearing 45 fixed to the housing 41.
  • the angular bearing 45 is in a state where the axial movement is restricted between the bearing fixing rings 46a and 46b screwed into the opening of the housing 41 and the step 47 formed inside the housing 41. It is fixed.
  • the axial movement between the nut portion 42 and the angular bearing 45 is caused by a bearing fixing ring 48 screwed into the left end of the nut portion 42 and a step portion 49 formed on the outer periphery of the nut portion 42. Be regulated.
  • the steering handle is first operated to rotate the steering shaft, and the rack shaft 2 is moved in a direction corresponding to the rotation to perform a steering operation.
  • a steering torque sensor (not shown) is activated by this operation, electric power is supplied from the knotter to the coil 14 via the lead wire according to the detected torque.
  • the motor 1 operates and the rotor shaft 22 rotates.
  • the nut portion 42 coupled therewith rotates, and the axial assisting force is transmitted to the rack shaft 2 by the action of the ball screw mechanism 3. Thereby, the movement of the rack shaft 2 is promoted, and the steering force is assisted.
  • the brushless motor 71 of the second embodiment (hereinafter abbreviated as “motor 71”) has the same basic configuration as the motor 1 of the first embodiment, but the magnet holder 72 has a divided structure, which improves design flexibility. It is illustrated.
  • the same members and portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • EPS brushless motors are required to be highly flexible and compatible with a wide variety of vehicle body lineups.
  • brushless motors are still more expensive than brushed motors, and how to manufacture motors with a wide variety of specifications, including methods for processing single parts, has become a major issue.
  • the motor energization timing needs to be changed as appropriate according to various specifications.
  • the specifications of the body left and right of the handle, etc.
  • various specifications are often supported by changing the energization timing.
  • Such a change in the energization timing can be arbitrarily made by design depending on the configuration of the stator side and the rotor side, and the following change method is known.
  • the resolver stator is integrated with the connector that connects the sensor wires, so the structure of the resolver stator must be changed in order not to change the sensor connector pull-out position.
  • the stator core is integrated with the external connection terminal (power connector) via the terminal unit. Therefore, in order not to change the drawing position of the external connection terminal, the structure of the terminal unit is not changed. Need to change. In other words, when the energization timing is changed on the stator side, the resolver stator and terminal unit must be changed significantly.
  • the angular positional relationship between the magnet 24 and the resolver rotor 35 can be easily changed by changing the position of the resolver rotor connecting piece 57 formed in the magnet holder 51 in the circumferential direction. can do. Therefore, when the change on the stator side is compared with the change on the rotor side, the specification on the rotor side can be changed more easily.
  • the magnet holder 72 is divided into two in the axial direction, and the magnet holder is shared, thereby realizing a reduction in mold cost.
  • the magnet holder 72 is composed of two parts, that is, a magnet holding part 73 and a resolver rotor connecting part 74, and both are integrally joined by a holder joining part 75.
  • FIG. 5 shows the configuration of the magnet holding portion 73
  • FIG. 6 shows the configuration of the resolver rotor connecting portion 74.
  • the magnet holding portion 73 has a configuration in which the lower half of the magnet holder 51 of FIG. 2 is made independent, and a base portion 76 and a holder arm 77 are formed.
  • the holder arm 77 extends from the base portion 76 in the axial direction.
  • the holder arm 77 has a substantially T-shaped cross section. Between the adjacent holder arms 77, the magnet 24 is pressed into the axial force. As a result, the magnet 24 is held and fixed between the outer peripheral surface of the rotor core 23 and the holder arm 77.
  • the base portion 76 is formed in a ring shape.
  • the base portion 76 is formed with a shaft through hole 78 through which the rotor shaft 22 is passed.
  • a fitting groove 79 is formed around the shaft through hole 78 along the axial direction. The fitting groove 79 is equally divided into three force points in the circumferential direction.
  • a resolver rotor connecting piece 57 is provided on the right end side of the resolver rotor connecting portion 74 in FIG. 6 (a).
  • the resolver rotor connecting pieces 57 are projected from the end of the resolver rotor connecting portion 74 in the axial direction, and are formed in three equal portions in the circumferential direction.
  • the resolver rotor connecting piece 57 includes a base piece portion 58 and a fitting claw 59 and is lightly press-fitted into the fitting groove 66 of the resolver rotor 35.
  • a fitting piece 81 used for connection to the magnet holding portion 73 is also provided on the left end side of the resolver rotor connecting portion 74 so as to project.
  • the fitting pieces 81 are arranged in three equal positions in the circumferential direction corresponding to the fitting grooves 79 of the magnet holding portion 73.
  • a holder joint 75 is formed by the fitting groove 79 and the fitting piece 81.
  • the circumferential dimension of the fitting piece 81 is slightly larger than the circumferential dimension of the fitting groove 79.
  • the resolver rotor connecting portion 74 is attached to the magnet holding portion 73 in such a manner that the fitting piece 81 is lightly press-fitted into the fitting groove 79.
  • the energization timing can be changed only by adjusting the angle of the position of the resolver rotor connecting piece 57 in the resolver rotor connecting portion 74 in the circumferential direction. It can be performed. Therefore, it is possible to respond to a wide variety of specifications only by changing the resolver rotor connection part 74, and there is no need for a large and complicated new mold when changing specifications, and it is possible to flexibly respond to many vehicle body lineups with cheaper parts.
  • the power S can be.
  • the resolver rotor connecting portion 74 for newly producing a mold can be formed with a simple mold divided into upper and lower parts because of a simple shape without an undercut portion. Therefore, according to the motor of the present invention, it is possible to provide a product excellent in cost performance with reduced mold costs.
  • the resolver rotor connecting portion 74 can be manufactured by cutting without producing a mold, it is possible to shorten the lead time for producing a prototype when considering a small production such as a prototype. It becomes possible.
  • the magnet holder with a short magnetic circuit length can be used to hold the magnet of a long motor sufficiently, it can be shortened. It is sufficient to make only the magnet holder. Therefore, the part specifications can be reduced correspondingly, and the cost can be further reduced.
  • the above-described embodiment shows a configuration in which the resolver rotor connecting piece 57 and the fitting groove 66 form the resolver coupling portion 63, and the fitting groove 79 and the fitting piece 81 form the holder joint portion 75.
  • the unevenness is arranged on either side of the force S, the joint 63, and the joint 75. It can be changed as appropriate.
  • a pin may be planted on the resolver rotor 35 side, and a notch hole, a groove, or the like into which the pin can be fitted may be provided in the magnet honorada 51.
  • the concave-convex relationship at the holder joint 75 may be set in reverse.
  • the configuration in which both the spacers on both sides of the resolver rotor are eliminated is shown.
  • FIG. 1 of the resolver rotor 35 in which the flange portion 64 is not provided only the spacer on the right side is provided. It may be arranged.
  • the magnet holders 51 and 71 may be configured to fix the magnet holders 51 and 71 to the rotor core 23 with the force S configured to be fixed to the rotor shaft 22.
  • the force S shown in the example in which the stator according to the present invention is used in a brushless motor used as an EPS drive source the stator is not limited to the EPS brushless motor, It can be widely applied to brushless motors for other purposes.
  • the present invention is widely applicable to general brushless motors.
  • the present invention can be applied to other types of EPS motors such as the force S shown for the brushless motor used in the rack assist type EPS and the column assist type.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Brushless Motors (AREA)
  • Power Steering Mechanism (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

Le moteur sans balai (1) selon l'invention est doté d'une section de retenue d'aimant (52) permettant de retenir/fixer un aimant, et d'un porte-aimant (51) pourvu d'une section de raccord de rotor de résolveur (54) connectée à un rotor de résolveur (35). La section de raccord de rotor de résolveur (54) et le rotor de résolveur (35) sont couplés l'un à l'autre au moyen d'une section de couplage de résolveur (63). La section de couplage de résolveur (63) est constituée d'une pièce de raccord de rotor de résolveur (57), qui est formée sur la section de raccord de rotor de résolveur (54), et d'une rainure de fixation (66), qui est formée sur le rotor de résolveur (35). Dans une rainure de fixation (66), une griffe de fixation (59) de la pièce de raccord de rotor de résolveur (57) est ajustée par pression et fixée, et le rotor de résolveur (35) ainsi que le porte-aimant (51) sont connectés suivant une relation de position angulaire prescrite. Un arbre rotor (22) est équipé d'une section de bride (64) permettant d'empêcher le retrait du rotor de résolveur (35).
PCT/JP2007/071609 2006-11-15 2007-11-07 Moteur sans balai WO2008059736A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008544110A JP5059021B2 (ja) 2006-11-15 2007-11-07 ブラシレスモータ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-308746 2006-11-15
JP2006308746 2006-11-15

Publications (1)

Publication Number Publication Date
WO2008059736A1 true WO2008059736A1 (fr) 2008-05-22

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PCT/JP2007/071609 WO2008059736A1 (fr) 2006-11-15 2007-11-07 Moteur sans balai

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JP2013135506A (ja) * 2011-12-26 2013-07-08 Nippon Densan Corp モータ
WO2015052962A1 (fr) * 2013-10-11 2015-04-16 株式会社日立産機システム Machine électrique rotative
JP2016154428A (ja) * 2015-02-21 2016-08-25 株式会社ミツバ ブラシレスモータ
US11837935B2 (en) 2021-02-02 2023-12-05 Black & Decker, Inc. Canned brushless motor

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JP2013135506A (ja) * 2011-12-26 2013-07-08 Nippon Densan Corp モータ
CN103620915A (zh) * 2011-12-26 2014-03-05 日本电产株式会社 马达
US9496761B2 (en) 2011-12-26 2016-11-15 Nidec Corporation Inner rotor magnet holder
US10468926B2 (en) 2011-12-26 2019-11-05 Nidec Corporation Motor
WO2015052962A1 (fr) * 2013-10-11 2015-04-16 株式会社日立産機システム Machine électrique rotative
JP2015077032A (ja) * 2013-10-11 2015-04-20 株式会社日立産機システム 回転電機
JP2016154428A (ja) * 2015-02-21 2016-08-25 株式会社ミツバ ブラシレスモータ
US11837935B2 (en) 2021-02-02 2023-12-05 Black & Decker, Inc. Canned brushless motor
US11855521B2 (en) 2021-02-02 2023-12-26 Black & Decker, Inc. Brushless DC motor for a body-grip power tool
US11870316B2 (en) 2021-02-02 2024-01-09 Black & Decker, Inc. Brushless motor including a nested bearing bridge
US11876424B2 (en) 2021-02-02 2024-01-16 Black & Decker Inc. Compact brushless motor including in-line terminals
US11955863B2 (en) 2021-02-02 2024-04-09 Black & Decker Inc. Circuit board assembly for compact brushless motor

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