CN202889017U - Motor - Google Patents

Motor Download PDF

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Publication number
CN202889017U
CN202889017U CN2012204869493U CN201220486949U CN202889017U CN 202889017 U CN202889017 U CN 202889017U CN 2012204869493 U CN2012204869493 U CN 2012204869493U CN 201220486949 U CN201220486949 U CN 201220486949U CN 202889017 U CN202889017 U CN 202889017U
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CN
China
Prior art keywords
magnet
motor
cylindrical portion
arm
base portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2012204869493U
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Chinese (zh)
Inventor
长泽纯
西川淳志
古川敬三
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Nidec Corp
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Nidec Corp
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Filing date
Publication date
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Publication of CN202889017U publication Critical patent/CN202889017U/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • 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
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
    • 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
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2211/00—Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
    • H02K2211/03—Machines characterised by circuit boards, e.g. pcb

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Brushless Motors (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

The utility model provides a motor. A rotating part of the motor is provided with a shaft, a rotor holder, a magnet holder made of resin, and a plurality of magnets. The magnetic holder is provided with a base part and a plurality of arm parts, and the plurality of arm parts are extended from the base part toward a radial outer part of the rotor holder. The plurality of magnets are respectively disposed among the plurality of arm parts, therefore the positioning of the magnets in the peripheral direction can be realized. Because the base part is disposed on the position, which is overlapped with the positions of the magnets in the radial direction, therefore the axial lengths of the magnets are not limited. The axial lengths of the magnets can be prolonged, and the strong magnetic force can be achieved, in addition, the peripheral widths of the arm parts are shorter than the radial lengths of the arm parts. The peripheral lengths of the magnets can be prolonged, therefore the stronger magnetic force can be achieved.

Description

Motor
Technical field
The utility model relates to a kind of inner-rotor type motor.
Background technology
In the past is to make rotating part with magnet at the inner-rotor type motor of the interior sideway swivel of coil.For example, put down in writing a kind of brushless motor in the TOHKEMY 2007-288977 communique, this brushless motor take stator, interior all sides of stator be supported for the rotor that can rotate and with stator and rotor be contained in inner casing as the main composition key element (paragraph 0020, Fig. 1).And, in this communique, put down in writing at the outer peripheral face of the lining cylindraceous of rotor the magnet (paragraph 0022) of a plurality of fan-shapeds be installed.
The utility model content
But, if with a plurality of magnet with respect to cylindraceous along circumferential array, adjacent magnet can attract each other or repel.Consequently, the circumferential position of a plurality of magnet can be offset and produce large gap a position sometimes.If the circumferential position of magnet produces skew, then when CD-ROM drive motor, easily produce vibration and noise.
According to the purposes of motor, the skew of this magnet is in allowed band sometimes.But, in order to provide higher-quality motor, the technology that a plurality of magnet more critically need to be located.
About this point, put down in writing in the TOHKEMY 2007-288977 communique and utilized the magnet retainer of a plurality of arms that have circular ring portion and extend vertically from ring portion to locate a plurality of magnet (paragraph 0030, paragraph 0042).But in the structure of this communique, one of ring portion and magnet is distolaterally axially contacting (paragraph 0032).Therefore, the axial length of magnet is limited by ring portion.
Thereby the purpose of this utility model provides a kind of structure that can obtain in circumferential a plurality of magnet in location and the axial and circumferential size that can increase magnet strong magnetic force in inner-rotor type motor.
Illustrated the first utility model of the application relates to a kind of motor, and it has: stationary part; With the rotating part that rotates centered by the central axis of above downward-extension, described rotating part has axle, rotor retainer, a plurality of magnet and resinous magnet retainer, described axle configures along described central axis, described rotor retainer has the cylindrical portion with described axle arranged coaxial, the outer peripheral face of described a plurality of magnet along circumferential array in described cylindrical portion, described magnet retainer has: the base portion that is fixed in described rotor retainer or described axle; And a plurality of arms of the extension of the radial outside from described base portion to described rotor retainer, the described a plurality of magnet of configuration between described a plurality of arms, described base portion is configured in described magnet in radially overlapping position, and the circumferential width of described arm is shorter than the radical length of described arm.
According to illustrated the first utility model of the application, come circumferentially locating a plurality of magnet by a plurality of arms.And the base portion of magnet retainer does not limit the axial length of magnet.Therefore, thus the axial length that can prolong magnet obtains strong magnetic force.And the circumferential width of arm is shorter than the radical length of arm.Therefore, thus the circumferential lengths that can prolong magnet obtains stronger magnetic force.
Description of drawings
Fig. 1 is the stereogram of the related motor of the first execution mode.
Fig. 2 is the longitudinal section of the related brushless motor of the second execution mode.
Fig. 3 is the longitudinal section of the related rotor unit of the second execution mode.
Fig. 4 is the vertical view of the related rotor unit of the second execution mode.
Fig. 5 is the stereogram of the related rotor unit of the second execution mode.
Fig. 6 is the stereogram of the situation of expression when making the related rotor unit of the second execution mode.
Fig. 7 is the stereogram of the situation of expression when making the related rotor unit of the second execution mode.
Fig. 8 is the stereogram of the situation of expression when making the related rotor unit of variation.
Fig. 9 is the vertical view of the related rotor unit of variation.
Figure 10 is the vertical view of the related rotor unit of variation.
Figure 11 is the longitudinal section of the related rotor unit of variation.
Figure 12 is the longitudinal section of the related brushless motor of variation.
Figure 13 is the longitudinal section of the related brushless motor of variation.
Symbol description
1,1F, 1G brushless motor
The 1A motor
2,2A stationary part
3,3A rotating part
9 central axis
21,21F housing
22 stator cores
23 insulating parts
25 circuit boards
26,26F bearing portion
30,30C, 30D, 30E, 30F rotor unit
31,31A, 31F axle
32,32A, 32E, 32F, 32G rotor retainer
33,33A, 33B, 33E, 33F, 33G magnet retainer
34,34A, 34B, 34C, 34D, 34G magnet
41,42 binding agents
251 Magnetic Sensors
321 fastening parts
322,322E, 322F top plate portion
323 path cylindrical portion
324 ring-type platform sections
325,325E, 325G cylindrical portion
326 ring-types are exposed face
The 327E rake
331,331A, 331E, 331F, 331G base portion
332,332A, 332B, 332C, 332D, 332G arm
The 333B stopper section
334D wall section
Embodiment
Below, with reference to accompanying drawing the illustrated execution mode of the utility model is described.In addition, below will describe as shape and the position relationship of above-below direction to each several part along the direction of the central axis of motor.But this only is to define for convenience of description, does not limit the related motor of the utility model direction in use.
＜1. the first execution mode＞
Fig. 1 is the stereogram of the related motor 1A of the first execution mode of the present utility model.Motor 1A has the stationary part 2A that represents with double dot dash line and the rotating part 3A that represents with solid line in Fig. 1 in Fig. 1.Rotate centered by the central axis 9A of the above downward-extension of rotating part 3A.
Rotating part 3A has axle 31A, rotor retainer 32A, magnet retainer 33A and a plurality of magnet 34A.Axle 31A configures along central axis 9A.Rotor retainer 32A has the cylindrical portion with axle 31A arranged coaxial.The outer peripheral face of a plurality of magnet 34A along circumferential array in cylindrical portion.
Magnet retainer 33A is resinous parts.Magnet retainer 33A has base portion 331A and a plurality of arm 332A.Base portion 331A also can fix with respect to rotor retainer 32A as shown in Figure 1.And base portion 331A also can fix with respect to axle 31A.A plurality of arm 332A from base portion 331A to rotor retainer 32A radially (with the direction of central axis quadrature.Lower same) outside extension.
A plurality of magnet 34A are disposed at respectively between a plurality of arm 332A.Thus, a plurality of magnet 34A circumferentially are being positioned.And as shown in Figure 1, base portion 331A is configured in magnet 34A in radially overlapping position.Therefore, the base portion 331A of magnet retainer 33A does not limit the axial (along the direction of central axis of magnet 34A.Length down together).Therefore, thus the axial length that can prolong magnet 34A obtains strong magnetic force.
And as shown in Figure 1, the circumferential width of arm 332A is shorter than the radical length of arm 332A.Therefore, can prolong the circumferential lengths of magnet 34A, thereby obtain stronger magnetic force.
＜2. the second execution mode＞
The overall structure of＜2-1. brushless motor＞
Next, the second execution mode of the present utility model is described.
The brushless motor 1 of present embodiment is such as being equipped on the household appliances such as air-conditioning and refrigerator, as the drive source use of fan and pump.But motor of the present utility model also can be the motor for other known application.For example, motor of the present utility model also can be equipped on OA equipment, Medical Devices, automobile etc., produces various actuating forces.Below, the equipment that is equipped with brushless motor 1 is called " drive unit ".
Fig. 2 is the longitudinal section of the related brushless motor of present embodiment 1.This brushless motor 1 is inner-rotor type motor.Brushless motor 1 has stationary part 2 and rotating part 3.Stationary part 2 is fixed in the framework of drive unit.Rotating part 3 is supported for respect to stationary part 2 and can rotates.
The stationary part 2 of present embodiment has housing 21, stator core 22, insulating part 23, coil 24, circuit board 25 and bearing portion 26.
Housing 21 is for keeping the metal-made parts of stator core 22 and bearing portion 26.The housing 21 of present embodiment is the parts of monomer.Housing 21 has bottom 211, outside cylindrical section 212, inside cylindrical section 213 and circular protrusion 214.Substantially planar ground below coil 24, bottom 211 extends.The end edge portion of outside cylindrical section 212 radial outside of 211 from the bottom extends towards the top roughly cylindricly.211 radially inner side extends roughly cylindricly in the bottom in inside cylindrical section 213.Circular protrusion 214 be between bottom 211 and inside cylindrical section 213 from the bottom 211 positions of outstanding ring-types downwards.When brushless motor 1 was installed on drive unit, circular protrusion 214 was embedded in the framework of drive unit.
Stator core 22 is by consisting of at formed laminate steels of electromagnetic steel plate such as axial lamination silicon steel plates.A plurality of teeth 222 that stator core 22 has circular iron core back 221 and gives prominence to towards radially inner side from iron core back 221.The inner peripheral surface of the outside cylindrical section 212 of shell 21 is fixed at iron core back 221.A plurality of teeth 222 are equally spaced along circumferential array.
Insulating part 23 is the resinous parts between stator core 22 and coil 24.Insulating part 23 is installed on each tooth 222, and covers the face except the radially inner side end face of each tooth 222.That is to say, the radially inner side end face of each tooth 222 exposes from insulating part 23.Coil 24 is made of the wire on every side that is wound in insulating part 23.By insulating part 23, stator core 22 and coil 24 electric insulations.
Circuit board 25 is fixed in the upper surface of insulating part 23.Circuit board 25 covers the top of coil 24, rotor retainer 32 described later, magnet retainer 33 described later and a plurality of magnet 34 described later.At the circuit board 25 assemblings circuit related with the driving of brushless motor 1.And, be provided with Magnetic Sensor 251 for detection of the magnetic flux of magnet 34 at the lower surface of circuit board 25.That is to say, stationary part 2 has the Magnetic Sensor 251 for detection of the magnetic flux of magnet 34.Magnetic Sensor 251 examples such as Hall element.The detection signal of Magnetic Sensor 251 is used for the rotating speed of control brushless motor 1.
Bearing portion 26 is to support to the mechanism that can rotate for the axle 31 with rotating part 3 sides.Bearing portion 26 is kept by the inside cylindrical section 213 of housing 21.Bearing portion 26 for example uses by spheroid and makes outer ring and the counterrotating ball bearing of inner ring.When using ball bearing, the inner ring of ball bearing remains in the outer peripheral face of axle 31.But bearing portion 26 also can use the bearing of other modes such as sliding bearing and FDB.
The rotating part 3 of present embodiment has axle 31, rotor retainer 32, magnet retainer 33 and a plurality of magnet 34.
Axle 31 is the roughly columned parts that extend at above-below direction along central axis 9.Axle 31 is supported by bearing portion 26 and rotation centered by central axis 9.The bottom of axle 31 is outstanding to the below of housing 21.And the upper end of axle 31 is outstanding to the top of circuit board 25.Bottom or the upper end of axle 31 are connected with the drive division of drive unit by Poewr transmission mechanisms such as gears.
Rotor retainer 32 has roughly parts cylindraceous of lid for what be fixed in axle 31.Rotor retainer 32 is such as forming by magnet plates such as punch process galvanized steel plain sheets.Magnet retainer 33 is for being fixed in the resinous parts of rotor retainer 32.
A plurality of magnet 34 are fixed in the outer peripheral face of rotor retainer 32.The face of the radial outside of each magnet 34 becomes the opposed magnetic pole strength of face with the radially inner side of stator core 22.A plurality of magnet 34 in the mode of the magnetic pole strength alternative arrangement of the magnetic pole strength of the N utmost point and the S utmost point along circumferentially uniformly-spaced arranging.
The rotor unit 30 that is made of rotor retainer 32, magnet retainer 33 and a plurality of magnet 34 rotates with axle 31 at the radially inner side of stator core 22 and coil 24.More detailed structure about rotor unit 30 is narrated in the back.
In this brushless motor 1, communicate drive current to the coil 24 of stationary part 2, will produce radially magnetic flux at a plurality of teeth 222 of stator core 22.And the effect by the magnetic flux between tooth 222 and the magnet 34 can produce circumferential torque.Consequently, rotating part 3 rotates centered by central axis 9 with respect to stationary part 2.
＜2-2. about the detailed structure of rotor unit＞
Next, rotor unit 30 more detailed structures are described.Fig. 3 is the longitudinal section of rotor unit 30.Fig. 4 is the vertical view of rotor unit 30.Fig. 5 is the stereogram of rotor unit 30.In addition, the cross section of the rotor unit 30 among Fig. 2 and Fig. 3 is equivalent to the A-A cross section of Fig. 4.
Rotor retainer 32 has fastening part 321, top plate portion 322, path cylindrical portion 323, ring-type platform section 324 and cylindrical portion 325.
Fastening part 321 is the position of the ring-type of the radially inner side that is arranged on top plate portion 322.Axle 31 is by being pressed into or binding agent is fixed in the inboard of fastening part 321.That is to say, the outer peripheral face of axle 31 is fixed in fastening part 321.Thus, axle 31 fixes with rotor retainer 32.The fastening part 321 of present embodiment is cylindricly along the outer peripheral face of axle 31 towards the below from the inner edge portion of the radially inner side of top plate portion 322 extends.Thus, axle 31 becomes large with the contact area of fastening part 321.Consequently, axle 31 is fixed securely with rotor retainer 32.And the skew between the central axis of the central axis of axle 31 and rotor retainer 32 diminishes.
Top plate portion 322 321 upper end extends towards radial outside from the fastening part.Top plate portion 322 is positioned at the top of bearing portion 26 and is positioned at the radially inner side of magnet retainer 33.Cylindrical portion 325 is the roughly position cylindraceous of extending vertically between the inside cylindrical section 213 of housing 21 and a plurality of magnet 34.Cylindrical portion 325 and axle 31 arranged coaxial.
Path cylindrical portion 323 and ring-type platform section 324 have formed the stage portion 320 between top plate portion 322 and cylindrical portion 325.Path cylindrical portion 323 is the roughly position cylindraceous of extending towards the below from the outer edge of the radial outside of top plate portion 322.The diameter of path cylindrical portion 323 is less than the diameter of cylindrical portion 325.Ring-type platform section 324 connects the bottom of path cylindrical portion 323 and the upper end of cylindrical portion 325.Ring-type platform section 324 radially and is circumferentially extending.
Magnet retainer 33 has circular base portion 331 and a plurality of arm 332.Base portion 331 be configured in rotor retainer 32 path cylindrical portion 323 radial outside and be configured in the top of ring-type platform section 324.The lower surface of base portion 331 contacts with the upper surface of ring-type platform section 324.And cylindrical portion 325 is positioned at the downside of base portion 331.A plurality of arms 332 are and downwards extension outstanding from base portion 331 to radial outside respectively.The lower end part of each arm 332 is in the radial outside of cylindrical portion 325.A plurality of arms 332 are along circumferentially uniformly-spaced arranging.And the quantity of the arm 332 that magnet retainer 33 has is consistent with the quantity of the magnet 34 that rotor unit 30 has.
Rotor retainer 32 and magnet retainer 33 are for example fixed by binding agent.When using binding agent, for example as shown in Figure 6, at the outer peripheral face coated with adhesive 41 of the path cylindrical portion 323 of rotor retainer 32.The inboard of then, this path cylindrical portion 323 being inserted the base portion 331 of magnet retainer 33.But, also can utilize additive methods such as being pressed into and inserting moulding to fix rotor retainer 32 and magnet retainer 33.
A plurality of magnet 34 are configured in respectively between a plurality of arms 332.That is to say, a plurality of magnet 34 are configured in the circumferential position by a plurality of arm 332 regulations.When making brushless motor 1, can utilize a plurality of arms 332 easily and accurately to locate the circumferential position of each magnet 34.Particularly when the magnet 34 that configuration has been magnetized in advance, can either prevent that adjacent magnet 34 from adsorbing or repelling owing to magnetic force, again can phase magnet 34.If a plurality of magnet 34 are circumferentially being located accurately, then the pulsation of torque is inhibited, and the vibration and the noise that are accompanied by the driving of brushless motor 1 will reduce.And the skew of the center of gravity of rotating part 3 also is inhibited.
Particularly, the arm 332 of present embodiment further extends towards the below from the position of the radial outside of base portion 331.Thus, with the contact-making surface of magnet 34 axially elongated.Along such arm 332 distributed magnets 34, not only can easily suppress the circumferential position skew of magnet 34, also can easily suppress the inclination of magnet 34.
Rotor retainer 32 and magnet retainer 34 are for example fixed by binding agent.When using binding agent, for example as shown in Figure 7, at the outer peripheral face coated with adhesive 42 of the cylindrical portion 325 of rotor retainer 32.Then, between a plurality of arms 332, configure each magnet 34, each magnet 34 is fixed on the outer peripheral face of cylindrical portion 325.
Particularly in the present embodiment, the bottom of arm 332 does not reach the bottom of the cylindrical portion 325 of rotor retainer 32.That is to say, the lower end of arm 332 is in the position than the top side in bottom of rotor retainer 32.Therefore, the outer peripheral face of cylindrical portion 325 is included in the ring-type that complete cycle exposes from arm 332 and exposes face 326.Binding agent 42 exposes between face 326 and each magnet 34 between ring-type.During coated with adhesive 42, make the mouth of binding agent 42 expose face 326 near ring-type, when rotor retainer 32 is rotated centered by central axis 9 from the mouth binding agent 42 that spues.So, can easily binding agent 42 be coated in the outer peripheral face of cylindrical portion 325.
And as shown in Figure 3, in the present embodiment, the end edge portion of the radially inner side of the outer peripheral face of cylindrical portion 325 and arm 332 is opposed across gap 301.Between cylindrical portion 325 and arm 332, gap 301 is set, when fixed magnet 34, even above-mentioned binding agent 42 extends upward, is not prone to also that this binding agent 42 is stopped by arm 332 and the state that swells.Therefore, can suppress floating of the magnet 34 that caused by binding agent 42.
And such as Fig. 3～shown in Figure 5, the base portion 331 of magnet retainer 33 is configured in the radially inner side of the upper end of magnet 34.That is to say, the base portion 331 of magnet retainer 33 is configured in magnet 34 in radially overlapping position.In such structure, the axial length of magnet 34 is not subjected to base portion 331 restrictions.Therefore, can prolong the axial length of magnet 34 to obtain strong magnetic force.
And each arm 332 of magnet retainer 33 forms radially and axial extension lamellar.As shown in Figure 4, the circumferential width d1 of arm 332 is shorter than the radical length d2 of arm 332.Like this, can prolong the circumferential lengths of magnet 34.Consequently, can obtain stronger magnetic force.
If make the magnet retainer by the punch process metal, then be difficult to a plurality of arms are processed into aforesaid lamellar.To this, in the present embodiment, make magnet retainer 33 by resin forming.Therefore, can easily realize satisfying the tabular arm 332 of above-mentioned size relationship d1＜d2.
And if use magnetic as the material of magnet retainer, then arm can increase from the magnetic flux that magnet absorbs.To this, use in the present embodiment resin as the material of magnet retainer 33.Therefore, the absorption of 332 magnetic flux is inhibited from magnet 34 to arm.Consequently, the switching of circumferential magnetic flux becomes clear, and the magnetic characteristic of brushless motor 1 improves.
And the arm 332 of present embodiment is outstanding to radial outside from the outer peripheral face of base portion 331, and extends towards the below.That is to say, the upper-end part of driving of arm 332 is in the position than the top side of lower surface of base portion 331.Therefore, can make the upper end of cylindrical portion 325 of rotor retainer 32 near the lower surface of base portion 331.Consequently, cylindrical portion 325 is axially elongated, is improved as the function of the back of the body yoke of magnet 34.
And in the present embodiment, base portion 331 is configured in path cylindrical portion 323 in radially overlapping position.Therefore, compare with the situation that base portion 331 is configured in the upper surface of top plate portion 322, the axial dimension of the integral body of rotor retainer 32 and base portion 331 is inhibited.And in the present embodiment, the lower surface of base portion 331 contacts with the upper surface of ring-type platform section 324.Thus, base portion 331 is axially being located accurately with respect to rotor retainer 32.
And in the present embodiment, the base portion of magnet retainer 33 331 is not between magnet 34 and be configured between the Magnetic Sensor 251 of top of magnet 34.That is to say, at least a portion of the upper surface of magnet 34 is exposed.And Magnetic Sensor 251 is configured in the top of magnet 34.Thus, can make the upper surface of magnet 34 near Magnetic Sensor 251.If the distance of the upper surface of magnet 34 and Magnetic Sensor 251 approaches, the accuracy of detection of Magnetic Sensor 251 will improve.
And this brushless motor 1 has roughly rotor retainer 32 cylindraceous of lid is arranged as mentioned above.And, dispose bearing portion 26 at the radially inner side of the cylindrical portion 325 of this rotor retainer 32.And the cylindrical portion 325 of bearing portion 26, rotor retainer 32 and magnet 34 are to configure in radially overlapped mode.Thus, the axial dimension of brushless motor 1 is inhibited.And bearing portion 26 is at the height and position back shaft 31 close to the center of gravity of rotor retainer 32.
＜3. variation＞
Above, the illustrated execution mode of the utility model is illustrated, but the utility model is not limited to above-mentioned execution mode.Below, to various variation by with the difference of the second execution mode centered by describe.
The stereogram of the situation when Fig. 8 makes the related rotor unit of a variation for expression.In the example of Fig. 8, be provided with the stopper section 333B that extends along circumferentially in the upper end of the arm 332B of magnet retainer 33B.During fixed magnet 34B, the circumferential both ends of the upper surface of magnet 34B are contacted with the lower surface of stopper section 333B.Like this, can utilize stopper section 333B to come at axial location magnet 34B.
In addition, in the example of Fig. 8, the chamfered section at the circumferential both ends of the upper surface that is arranged on magnet 34B is contacted with stopper section 333B.And the circumferential middle body of the upper surface of magnet 34B exposes from stopper section 333B.Like this, the upper end of magnet 34B can be configured in and the equal above height and position of the lower surface of stopper section 333B.Therefore, can guarantee the axial length of magnet 34B.Magnet 34B contacts with stopper section 333B at least one circumferential end and gets final product.And the upper surface of magnet 34B exposes from stopper section 333B in circumferential at least a portion and gets final product.
Fig. 9 is the vertical view of the related rotor unit 30C of other variation.In the example of Fig. 9, the circumferential width of arm 332C is along with becoming large towards radial outside.Consequently, compare with the circumferential interval of the radial inner end of a plurality of arm 332C, the circumferential interval of the radial outer end section of a plurality of arm 332C is little.Like this, the part of arm 332C is configured in the radial outside at the circumferential both ends of magnet 34C.Therefore, magnet 34C the flying out to radial outside that the centrifugal force in the time of can preventing by rotation causes.
Figure 10 is the vertical view of the related rotor unit 30D of other variation.In the example of Figure 10, has the 334D of wall section that extends along circumferentially in the end of the radial outside of arm 332D.The 334D of wall section is configured in the radial outside at the circumferential both ends of magnet 34D.Therefore, magnet 34D the flying out to radial outside that the centrifugal force in the time of can preventing by rotation causes.
Figure 11 is the longitudinal section of the related rotor unit 30E of other variation.In the example of Figure 11, rotor retainer 32E has rake 327E to replace path cylindrical portion and ring-type platform section.Rake 327E extends towards radial outside and towards the below from the outer edge of top plate portion 322E, and rake 327E connects the peripheral part of top plate portion 322E and the upper end of cylindrical portion 325E.
In the example of Figure 11, the base portion 331E of magnet retainer 33E is configured in the radial outside of rake 327E and is configured in the top of rake 327E.Therefore, and compare in the situation of the upper surface of top plate portion 322E configuration base portion 331E, the whole axial dimension of rotor retainer 32E and base portion 331E is inhibited.And in the example of Figure 11, base portion 331E contacts with rake 327E.Thus, base portion 331E is axially being configured accurately with respect to rotor retainer 32E.
In addition, as shown in figure 11, rake can be the curved surface of linearly extension when analysing and observe, and also can be the curved surface of curved shape extension when analysing and observe.
Figure 12 is the longitudinal section of the related brushless motor 1F of other variation.In the example of Figure 12, not in the inboard of rotor retainer 32F, but than the top side's of rotor unit 30F position with than rotor unit 30F position on the lower bearing portion 26F is being set respectively.Each bearing portion 26F is between housing 21F and axle 31F.
In the example of Figure 12, the base portion 331F of magnet retainer 33F is configured in the upper surface of the top plate portion 322F of rotor retainer 32F.And base portion 331F is directly fixing with respect to axle 31.But, in this structure, need guarantee zone for fixed base 331F at the outer peripheral face of axle 31.On this viewpoint of axial dimension that suppresses motor, preferred the second execution mode described above is fixing with respect to rotor retainer 32 with the base portion 331 of magnet retainer 33 like that.
Figure 13 is the longitudinal section of the related brushless motor 1G of other variation.In the example of Figure 13, near the bottom of the cylindrical portion 325G of rotor retainer 32G, dispose magnet retainer 33G.Specifically, the base portion 331G of magnet retainer 33G is fixed in the inner peripheral surface of cylindrical portion 325G.And a plurality of arm 332G are outstanding from base portion 331G to radial outside, and extend upward at the radial outside of cylindrical portion 325G.Like this, even at the cylindrical portion 325G of axially-extending rotor retainer 32G, also can suppress near the bottom of this cylindrical portion 325G distortion by magnet retainer 33G.Therefore, thus can obtain stronger magnetic force at axially-extending cylindrical portion 325G and magnet 34G.
And as other variation, the base portion of magnet retainer also can be the ring-type of non-annular.And the base portion of magnet retainer also can be the shape beyond the ring-type.For example, the base portion of magnet retainer also can be and be C word shape when overlooking, namely circular-arc centered by central axis.But the second execution mode described above is such, and the difficult error this point that produces from the circumferential interval of a plurality of arms 332 preferably makes the base portion 331 of magnet retainer 33 be ring-type.
And a plurality of magnet also can be arranged in circumferential continuous mode with homopolarity extremely such as the N utmost point, the N utmost point, the S utmost point, S.Like this, can suppress the circumferential size of each magnet and increase the circumferential width of each magnetic pole.
And the quantity of magnet and arm also can be the quantity different from above-mentioned execution mode.For example, also can between arm and arm, configure two magnet.In this case, as long as circumferential arbitrary end of each magnet contacts with arm, each magnet gets final product circumferentially being positioned thus.
And arm and magnet also can all be fixed in the cylindrical portion of rotor retainer by binding agent.That is to say, also can make binding agent between the outer peripheral face of cylindrical portion and a plurality of arm and between the outer peripheral face and a plurality of magnet of cylindrical portion.In this case, the bottom of arm can extend to the position with the bottom equal height of cylindrical portion, also can not reach the bottom of cylindrical portion.When by binding agent cylindrical portion and arm being fixed, at first at the outer peripheral face coated with adhesive of the cylindrical portion of rotor retainer.Then, insert the cylindrical portion of rotor retainer in the inboard of a plurality of arms.Then, each magnet is installed between a plurality of arms.Like this, each arm is firmly fixed at cylindrical portion.Therefore, the mechanical strength of each arm will improve.
The material of magnet can be ferrite, also can be neodymium.But the price of rare earth neodymium is surging in recent years, uses the neodium magnet difficult.On the other hand, when using ferritic sintered magnet, be difficult to make the magnet of ring-type.Therefore, want to use ferrite as the material of magnet and circumferentially to arrange accurately this specification requirement of a plurality of ferrite lattices higher.In this, the utility model is particularly useful.
And a plurality of arms are outstanding from base portion 331 to radial outside according to embodiment, also can further extend downwards, also can extend upward.That is to say, arm is extending axially.
In addition, the shape at the details position of each parts also can be different from the shape shown in each figure of the application.
And each key element that occurs in above-mentioned execution mode and variation can suitably make up in the scope that does not produce contradiction.
Industrial utilizability
The utility model can be used in inner-rotor type motor.

Claims (23)

1. a motor is characterized in that, described motor comprises:
Stationary part; With
Rotating part rotates centered by the central axis of its above downward-extension,
Described rotating part has:
Axle, it configures along described central axis;
The rotor retainer, it has the cylindrical portion with described axle arranged coaxial;
A plurality of magnet, the outer peripheral face of described a plurality of magnet along circumferential array in described cylindrical portion; And
Resinous magnet retainer, it has a plurality of arms that the base portion that is fixed in described rotor retainer or described axle and the radial outside from described base portion to described rotor retainer extend,
The described a plurality of magnet of configuration between described a plurality of arms,
Described base portion is configured in described magnet in radially overlapping position,
The circumferential width of described arm is shorter than the radical length of described arm.
2. motor according to claim 1, wherein,
Described cylindrical portion is positioned at the downside of described base portion,
The upper-end part of driving of described arm is in the position than the top side of lower surface of described base portion.
3. according to claim 1 or motor claimed in claim 2, wherein,
Described base portion is ring-type.
4. according to claim 1 or motor claimed in claim 2, wherein,
Described rotor retainer also has:
The fastening part, it is fixed to the outer peripheral face of described axle; And
Top plate portion, it extends towards radial outside from described fastening part,
Described magnet retainer is fixed in described rotor retainer.
5. motor according to claim 4, wherein,
The outer peripheral face of described fastening part from the inner edge portion of described top plate portion along described axle is cylindricly and extends.
6. motor according to claim 4, wherein,
Described rotor retainer also has:
The path cylindrical portion, extend towards the below its outer edge from described top plate portion, and diameter is less than the diameter of described cylindrical portion; And
Ring-type platform section, it connects the bottom of described path cylindrical portion and the upper end of described cylindrical portion,
Described base portion is configured in the radial outside of described path cylindrical portion and is configured in the top of described ring-type platform section.
7. motor according to claim 6, wherein,
The lower surface of described base portion contacts with the upper surface of described ring-type platform section.
8. motor according to claim 4, wherein,
Described rotor retainer also has rake, and described rake extends towards radial outside and towards the below from the outer edge of described top plate portion, and connects the peripheral part of described top plate portion and the upper end of described cylindrical portion,
Described base portion is configured in the radial outside of described rake and is configured in the top of described rake,
Described base portion contacts with described rake.
9. according to claim 1 or motor claimed in claim 2, wherein,
Described stationary part has the Magnetic Sensor for detection of the magnetic flux of described magnet,
Described magnetic sensor configuration is above described magnet.
10. according to claim 1 or motor claimed in claim 2, wherein,
At least a portion of the upper surface of described magnet is exposed.
11. according to claim 1 or motor claimed in claim 2, wherein,
Described stationary part has described axle is supported for the bearing portion that can rotate,
Described bearing portion is configured in the radially inner side of described cylindrical portion.
12. according to claim 1 or motor claimed in claim 2, wherein,
Described arm extends vertically.
13. motor according to claim 12, wherein,
Described arm is outstanding from described base portion to radial outside, and extends downwards.
14. motor according to claim 13, wherein,
The lower end part of described arm is in the position than the top side in bottom of described rotor retainer.
15. motor according to claim 12, wherein,
The outer peripheral face of described cylindrical portion and the inner edge portion of described arm are opposed across the gap.
16. according to claim 1 or motor claimed in claim 2, wherein,
The outer peripheral face of described cylindrical portion is included in complete cycle and exposes face from the ring-type that described arm exposes,
Binding agent exposes between face and the described magnet between described ring-type.
17. according to claim 1 or motor claimed in claim 2, wherein,
Binding agent is between the outer peripheral face and described a plurality of arm of described cylindrical portion.
18. according to claim 1 or motor claimed in claim 2, wherein,
Described arm has from the upper end along the stopper section of circumferentially extending,
The upper surface of described magnet contacts with described stopper section at least one circumferential end, and exposes from described stopper section in circumferential at least a portion.
19. according to claim 1 or motor claimed in claim 2, wherein,
The circumferential interval of the radial outer end section of described a plurality of arms is less than the circumferential interval of the radial inner end of described a plurality of arms.
20. according to claim 1 or motor claimed in claim 2, wherein,
Described a plurality of arm has the wall section of circumferentially extending from the edge, end of the radial outside of described a plurality of arms,
Described wall section is configured in the radial outside at the circumferential both ends of described magnet.
21. according to claim 1 or motor claimed in claim 2, wherein,
Described magnet is ferrite lattice.
22. according to claim 1 or motor claimed in claim 2, wherein,
The quantity of described arm is consistent with the quantity of described magnet.
23. motor according to claim 1, wherein,
Dispose described base portion in the bottom of described cylindrical portion,
Described base portion is fixed in the inner peripheral surface of described cylindrical portion.
CN2012204869493U 2011-10-05 2012-09-21 Motor Expired - Fee Related CN202889017U (en)

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DE102017128127B4 (en) * 2017-11-28 2023-05-04 Pierburg Gmbh Magnetic rotary fluid valve
KR102533810B1 (en) * 2018-02-08 2023-05-18 엘지이노텍 주식회사 Motor
US11456636B2 (en) 2018-02-08 2022-09-27 Lg Innotek Co., Ltd. Motor
KR102564743B1 (en) * 2018-05-11 2023-08-08 엘지이노텍 주식회사 Motor
JP2019176660A (en) * 2018-03-29 2019-10-10 日本電産株式会社 Rotor assembly, motor, blower, and vacuum cleaner
JP2019176662A (en) * 2018-03-29 2019-10-10 日本電産株式会社 Rotor assembly, motor, blower, and vacuum cleaner
KR102626461B1 (en) * 2018-09-18 2024-01-18 엘지이노텍 주식회사 Motor
KR20210081014A (en) * 2019-12-23 2021-07-01 엘지이노텍 주식회사 Motor

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JP3779097B2 (en) * 1999-07-23 2006-05-24 日本電産サンキョー株式会社 Electric motor rotor
JP2006271057A (en) * 2005-03-23 2006-10-05 Toshiba Mitsubishi-Electric Industrial System Corp Rotor of permanent magnet synchronous motor
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