JPS6149643A - Stator in synchronous motor - Google Patents

Abstract

PURPOSE:To improve the mechanical strength of magnetic pole pieces, by a method wherein a plurality of strip form magnetic pole pieces are jointed to collar pieces with fusion to form squirrel-cage magnetic pole members and the two magnetic pole members are fitted and connected together with an insulating connector to form a stator unit. CONSTITUTION:Ring-formed collar pieces 32 of substance of high permeability having projections for fitting a plurality of magnetic pole pieces in the inner circumference of the collars are formed, and strip form magnetic pole pieces 33 of circular cross section are jointed to the projections for fitting each magnetic piece with fusion to form squirrel-cage magnetic pole members 34. After the two squirrel-cage magnetic pole members 34 are confronted against each other and the magnetic pole piece 33 on one side is fitted on the pole piece 33 on the other side to be arranged together in non-contact manner, the pole pieces 33 are integrated and connected together with an insulating connector 35 to form a hollow-drum-shaped stator unit 23. And the shell section of the stator unit 23 is wound up with a winding 24 and is provided with a stator yoke 25 to face against a permanent magnet rotor 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synchronous motor in which a stator is disposed concentrically with a cylindrical rotor in an externally fitted manner, and particularly to the stator.

As a stator in a conventional inner rotor type synchronous motor, there is a stator used in a motor roller motor disclosed in Japanese Patent Application No. 58-228912 Mei IIIF. Since it has a cantilever support structure, it is mechanically unstable, and if the air gap with the rotor is small, there is a risk of it sticking to the rotor, so it is necessary to provide a somewhat large air gap, and if this happens, the torque cannot be increased as much. There was such a problem.

One object of the present invention is to solve the above-mentioned problems of conventional stators and to provide a stator having magnetic pole pieces with a mechanically stable structure.

Another object of the present invention is to provide a stator having a structure that is easy to manufacture.

According to the stator of the present invention for achieving these objects, the stator is composed of a hollow drum-shaped stator body consisting of a body and flanges at both ends thereof, and a winding wound around the stator body. The stator body is composed of a pair of squirrel cage magnetic pole members and an insulating connecting member that connects them in a non-contact state, and each squirrel cage magnetic pole member is formed in a ring shape from a high magnetic flux material of 13. A collar piece having a plurality of magnetic pole piece attachment protrusions protruding inwardly in the radial direction at regular intervals on the inner peripheral edge of the collar piece, and the protrusions each having a band shape and an arcuate cross section made of a high magnetic permeability material. The magnetic pole pieces are arranged in a cylindrical shape, and one end surface of each of the magnetic pole pieces is welded to one side surface of each of the magnetic pole piece attachment protrusions on the flange piece.

An embodiment in which the present invention is applied to a motor roller will be described below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of the motor roller, and FIG. 2 is a cross-sectional view of the motor roller. In these figures, 1 is a fixed shaft, 2 is a hollow cylindrical roller body, and this lobe member 3.4 is Further, fixed shaft side sleeve members 5.6 are respectively fixed on the fixed shaft 1 at positions facing the sleeve member 3.4, and these roller body side sleeve members 3, 4 and the fixed shaft side sleeve member 5 A bearing 7.8 is interposed between the fixed shaft side sleeve member 5.6 and the fixed shaft side sleeve member 5.6, which has a relatively thick wall. A lead-out hole 9 is provided through the hole 9 in the axial direction. 10
1 is an inner loaf fully synchronous motor provided inside the roller body 2, and 11 is a rotation transmission mechanism for transmitting the rotation of the motor 10 to the roller body 2 inside the roller body 2.

The above motor 10 has two rotors/set of left and right rotors 12A.
, 12B and stators 13A, 13B. The left and right rotors 12A and 12B are fitted with metal support tubes 14A and 14B that are loosely fitted and concentrically fitted around the fixed shaft l, with both ends remaining on the support tubes 14A and 14B, respectively. rotor bodies 15A, 15B made of hollow cylindrical permanent magnets fixed with adhesive; and support tubes 14A, 1.
The rotor bodies 15A, 15B are fitted onto both ends of the rotor bodies 15A, 15B, and are rotatably supported on the fixed shaft l by bearings 16, 17, 18, 19. Synthetic resin end support tube 2OA
1, 2OA2, 20Bt, 20days 2, and both rotors 12A.

12B are integrally rotatably connected by abutting the end surfaces of the adjacent end support tubes 20A2 and 20B and connecting them with an adhesive or the like via a connecting ring 21 inserted inside this abutted portion. Further, the right end support tube 2GB2 of the rotor 12B constitutes a so-called rotor output shaft portion, and a gear 22 for transmitting rotation to the rotational transmission mechanism 11 is formed at its tip.

On the other hand, the left and right stators 13A and 13B are connected to the rotor 1.
Hollow drum-shaped stake bodies 2 each on the left and right sides are fitted in series in a loosely fitted state to each of 2A and 12B.
3A! ~23A4.23Bt~23B4, the windings 24... wound around each stator body, and the respective stator bodies 23A1~23A4.23B+ ~23B4
Each long yoke band 25a is applied to the outer peripheral surface of the Jlml and holds them together.

It consists of left and right nostator yokes 25A and 25B consisting of left and right stator yokes 25a, 25a, 25b, 25b, and 25b, and the left end of the left and right stator yokes 25A is attached to a metal support cylindrical member 26 that is appropriately fixed to the fixed shaft 1. The right 0III end of the stator yoke 25B on the right side is fixed to the rotor 12.
It is fixed to a support sleeve 28 rotatably supported on B via a bearing 27, and the opposite ends of both stator corks 25A and 25B are integrally connected to each other by adhesive or the like via a connection [29]. are fixed to support sleeves 30, 30, respectively, which support sleeves 30, 30 are connected to the bearing 3.
1 and rotatably supported on rotors 12A and 12B. The above hollow drum type stator body 23A1-2
3A4. 23B1 to 23B4 have the same structure, and therefore, the seven stator bodies 23 will be explained with reference to FIGS. A pair of cage-shaped magnetic pole members 34 are formed by integrally protruding six strip-shaped magnetic pole pieces 33 made of a high magnetic coefficient material 32 in the axial direction at regular intervals in the circumferential direction. Prepare,
The pair of cage-shaped magnetic pole members 34, 34 are arranged so that each magnetic pole piece 33 of one magnetic pole member 34 projects between adjacent magnetic pole pieces 33, 33 of the other magnetic pole member 34 with a constant gap in the circumferential direction. An insulating connecting member 35 is fitted coaxially with each other and extends over the gap and outer peripheral surface of these magnetic pole pieces 33... as well as the opposing inner surfaces of both collar pieces 32 and 32. It is formed by resin molding into a hollow drum shape, and has magnetic pole pieces 33 arranged in a cylindrical shape and an insulating connection formed on the outer peripheral surface or in the gap between the magnetic pole pieces 33. The body of the stator main body 23 is formed by the member 35, and a flange is formed by each of the flange pieces 32 and the insulating connecting member 35 formed on the inner surface thereof. The insulating connecting member 35 has the function of insulating between the winding 24 wound around the stator body 23 and the squirrel-cage magnetic pole members 34.34, and also serves to connect the squirrel-cage magnetic pole members 34.34 together. It has a connecting function and needs to be formed over at least the outer periphery of the magnetic pole pieces 33 . On the outer peripheral edge of the collar piece 32 constituting the above-mentioned cage-shaped magnetic pole member 34, seven pairs/sets of engagement protrusions 36° 36 that are close to each other are integrally protruded and recessed at three locations at regular intervals in the circumferential direction. Then, each pair of engagement protrusions 36,364 are inserted into each other coaxially so that both cage-shaped magnetic pole members 34,34 are coaxially inserted into each other so that each magnetic pole piece 33 protrudes at a constant interval in the circumferential direction. The engagement protrusion pairs 36 and 36 of each set of the magnetic pole member 34 are arranged so as to be able to overlap in the axial direction. In addition, stator yoke 25A,
As shown in FIG. 2 and further in FIG. 6, each yoke twin 25b, 25b constituting the stake body 25B is made of a suitable high magnetic permeability material and has an arcuate cross section corresponding to the outer peripheral shape of the flange piece 32 of the stake body 23. Da stator bodies 23A1-2 arranged in series.
3A4 or 23B1 to 23B4 at positions corresponding to each engagement protrusion pair 36 and 36 of each collar piece 32/pair 1
Set of engagement holes 37.37°38, 38.39.39.40
．． 40 and 41.41 are bored, and in the engagement hole pair 37.37 of these, for example, the engagement protrusion pair 3 on the left side collar piece 32 of the stator main body 23B1 at the left end with respect to FIG.
6.36 is engaged with the engagement hole pair 38.38, and the locking protrusion pair 36.36 on the right side flange piece 32 on the stator body 23B and the left side flange piece on the right adjacent stator body 23B2 are engaged. The pair of engagement protrusions 36 and 36 on the stator main body 23B2 are engaged together in a circumferentially overlapping state. The pair 36.38 and the pair of engagement protrusions 36.36 on the left side collar piece 32 of the adjacent stator main body 23B3 on the right are engaged together with a fixed angle deviation in the circumferential direction, and the pair of engagement holes 40 .40 includes a pair of retaining protrusions 3 on the right side collar piece 32 of the stator main body 23B3.
6.36 and the pair of engagement protrusions 36.36 on the left flange piece 32 of the right end stator body 23B4 are engaged together in a circumferentially overlapping state, and the right flange of the right end stator body 23B4 Although only the yoke band 25a or 25b of 0 or more /1llil in which the pair of engagement protrusions 36, 36 on the piece 32 are engaged with the pair of engagement holes 41, 41 has been described, each yoke band 25
a.

25b has exactly the same structure, so J pieces/set of yoke bands 25a, 25a, 25a and 25b, 25b.

25b is the stator main body 23A1 to 23A4 and 2
381 to 23B4 respectively in the above-described engagement manner and in the arrangement state shown in FIG.
and 23B1 to 23B4 are interconnected so as not to be movable in the axial, circumferential, and radial directions.
3A4, and 23Bt, 23B2 and 2383.
23B4, a phase angle shift will occur. In this case, the stator body 23A+.

It is assumed that 23A2 and the stator bodies 23B+ and 23B2 are in the same phase, that is, the respective engagement protrusion pairs 36 and 36 overlap on the same straight line, and there is no phase angle shift between them. Further, as shown in FIG. 1, each yoke band 25a in the left stator yoke 25A
Both ends of the screw 43 are inserted through the screw hole 42 (see Fig. 9).
are fixed to the support cylindrical member 26 and the support sleeve 30, and both ends of each yoke band 25b in the right stator yoke 25B are similarly secured to the screws 43 through the holes 42.
is secured to the support sleeves 30 and 28 by.

Next, stators 13A, 1 having a body-like configuration
To explain the manufacturing method of No. 3B, first, a metal plate of a predetermined thickness made of a high magnetic permeability material is punched out, and the No. 6
A flange piece 32 having a shape as shown in Figure (A) is formed. As described above and further shown in FIG. 6(a), this collar piece 32 has a pair of engagement protrusions 3 adjacent to its outer periphery at regular intervals.
6.36 protrudes outward in the radial direction at equal pitches at three locations, and six magnetic pole piece attachment protrusions 32a are provided on the inner peripheral edge.
protrude inward radially at equal pitches, and each protrusion 3
The tip edge 32b of the flange 2a is formed into an arc with a radius R centered on the axis of the flange piece 32. Incidentally, the arrangement relationship between each engagement projection 36 and the arrangement relation between each engagement projection 36 and each magnetic pole piece attachment projection 32a are as shown in FIG. 6(A). On the other hand, a long strip material (not shown) made of a high magnetic permeability material, for example, is cold-drawn and has the required width and thickness and has an arcuate cross section corresponding to the arc of the tip edge of the projection 32a. ), and a large number of strip-shaped magnetic pole pieces 33 are formed from this long strip-shaped material. Then, six strip-shaped magnetic pole pieces 33 are arranged at right angles on the inner peripheral edge of the collar piece 32, and each strip-shaped magnetic pole piece 33
One end surface is brought into contact with the tip of one side of each magnetic pole piece attachment protrusion 32a by resistance welding such as spot 7) welding, thereby forming a cage-shaped magnetic pole member 34 as shown in FIG. . In this resistance welding, for example, as shown in FIGS. 7 and 8, a collar piece 32 is placed on one electrode Pi, and a jig T for positioning the magnetic pole piece is placed on this collar piece 33. Place it in the rIiti piece insertion hole S of this jig T.
Insert the magnetic pole piece 33 into each of them, bring one end surface of each magnetic pole piece 33 into contact with one side surface of each magnetic pole piece mounting protrusion 32a as shown in FIG. Place the other electrode P2 on top of the protruding magnetic pole piece 33 and apply pressure.
And I am trying to turn on the power. The pair of cage-shaped magnetic pole members 34 formed in this way is arranged as shown in FIG.
The pair of magnetic pole members 34, 34 are fitted coaxially with each other so as to protrude between the adjacent magnetic pole pieces 33, 33 with a constant gap in the circumferential direction, and while maintaining this state, a predetermined molding metal is inserted into the pair of magnetic pole members 34, 34. A mold is applied and injection molding is performed using thermoplastic resin, and as shown in FIG. An insulating connecting member 35 extending over the side surface is integrally formed. In this case, glass fiber reinforced resin is used as the thermoplastic resin. In addition, in order to prevent each magnetic pole piece 33 from vibrating laterally due to the molding pressure during molding and causing deviation in circumferential gap dimension, a part of the mold is plunge-fitted between each VA pole piece 33. Ru. Further, as is clear from FIG. 4, the tip end (the protruding end) of each magnetic pole piece 33 is formed diagonally so as to bite into the connecting member 35 in a wedge-like manner so as to be reliably and firmly connected. By forming the connecting member 35, the pair of magnetic pole members 34, 34 are integrally connected to form the hollow drum-shaped stator body 23 shown in FIG. 3.

A winding 24 is wound around the stator main body 23 thus formed, and an insulating tape 44 is applied to the outer surface of the winding 24. Then, a stator yoke 25A or 25B consisting of yoke bands 25a... or 25b...
is installed, and the stator 13A or 13B is completed.

Rotor bodies 15A, 15 of the rotors 12A, 12B
B has N pole, S pole, N pole, - along the circumferential direction, respectively.
・It is magnetized so that the magnetic pole a appears, and is inserted into the outer periphery of the rotor bodies 15A, 15B alternately in opposing directions within each stator body 23 of the stators 13A, 13B. Twelve magnetic bottle pieces 33, .

Further, the mutual connection state of the windings 24 wound around the stator bodies 23A1 to 23A4 and 23B1 to 23B4 of the stators 13A and 13B is as shown in the circuit diagram of FIG. In addition, in this circuit diagram, 2
4A1 is the winding wound around the stator body 23AI, 24A
2 is wound on the stake body 23A2, and the following is similarly 24A3
-24B4 indicate windings corresponding to the stator bodies 23A3 to 23B4, respectively. In addition, these windings 24A,
~24A4, 2・IB, ~24B4 blank leader line 4
5a, 45b, 45c are connected to the roller body 2 through the motor wire lead-out hole 9 of the fixed shaft example sleeve member 5 fixed to one end of the fixed shaft 1, as shown in FIG. control box 4.
A capacitor C is interposed between the lead wires 45a and 45b, and a switch Sw is provided between these lead wires 45a and 45b and the other IT&Jc4sd, and This electric wire and the lead wire 45c exit the control box 46 and are connected to a power source.

In this case, lead lines 45a and 45b from the roller body 2 to the control box 46.

A connector (not shown) may be interposed between the stator bodies 23A+ and 23A2 and 23A3 and 23A4, and between the stator bodies 23Bs and 23B2 and 2383°23 as described above.
Since the phase angle is slightly shifted between the winding B4 and the winding 24B+, due to the phase difference between the currents flowing through the winding 24A1, 24A2 and the winding 24A3, 24A4.

A rotating magnetic field is generated by the phase difference between the currents flowing through the windings 24B2 and the windings 24B3 and 24B4, so that sufficient starting torque and operating torque can be obtained.

In addition, in this embodiment, as is clear from FIG.
B4 are each connected in parallel, but it is also possible to connect them in parallel only at startup and switch them to series connection during operation to reduce the t flow during operation.

The rotation transmission mechanism 11 that transmits the rotation of the motor 10 to the roller body 2 is attached to the outer periphery of a gear 22 formed in an end support tube (rotor output shaft portion) 2082 connected to one end of the rotor body 15B. A plurality of meshable planetary gears 47
... are arranged at regular intervals in the circumferential direction, and each two idle gears 47 are pivotally attached to a support frame 48 fixed to a fixed shaft l, and each planetary gear 47 is attached to a hollow cylindrical support 49. The rotor 12A is meshed with an internal gear 5o formed on the inner peripheral surface, and one end of this cylindrical support 49 is fixed to the sleeve member 4 integral with the roller body 2 with an adhesive or the like. The rotation of 12B is the rotor output shaft 20Bz-
Gear 22 - Planet gear 47 - Internal gear 50 - Cylindrical support 4
9- The speed is decelerated and transmitted to the roller body 2 via the sleeve member 4. .

As explained above, the stake inferior to the present invention consists of a hollow drum-shaped stator body having a flange at a portion and both ends thereof, and this stator body connects a pair of cage-shaped magnetic pole members to each other in a non-contact manner. Since it is composed of an insulating connecting member that connects easily, the magnetic pole piece of each magnetic pole member can be mechanically stably supported, and there is no risk of it sticking to the rotor, so the air gap can be made smaller. Large torque can be obtained. In particular, in the stator of the present invention, the collar piece constituting each squirrel-cage magnetic pole member has a plurality of pole piece attachment protrusions that protrude inwardly and radially at regular intervals on its inner periphery, and these protrusions Since one end face of each strip-shaped magnetic pole piece having an arc-shaped cross section is welded to each side surface of the flange piece, it is easy to position and connect the flange piece and the magnetic pole piece when manufacturing the flange piece. The mounting position of the magnetic pole piece is determined by the protrusion provided on the side, and one end face of the magnetic pole piece can be brought into contact with the side surface of the protrusion, so welding work can be performed using a simple jig, etc., and is especially suitable for spot welding. Ideal for resistance welding.

In addition, since the plurality of strip-shaped magnetic pole pieces are arranged in a cylindrical shape, the diameter of the motor can be reduced by making the thickness of the magnetic pole member thinner, while reducing the air gap between each magnetic pole piece and the rotor. It has the advantage that it can be formed uniformly in the direction.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a motor roller, and No. 2 rJ! J is an enlarged sectional view taken along the line ■-n in Fig. 1, Fig. 3 is a perspective view showing the stator body of the motor used in the motor roller of Fig. 1, and Fig. 4 is an enlarged sectional view taken along the
Fig. 5 is a perspective view showing a pair of squirrel cage magnetic pole members forming the stake main body, Fig. 6 is a plan view showing the flange piece, Fig. 6 (b) 7 is a perspective view showing the magnetic pole piece, FIG. 7 is a plan view showing resistance welding of the flange piece and the magnetic pole piece using a jig, and FIG.
A line sectional view, FIG. 9 is an enlarged perspective view showing a yoke band constituting the stator yoke, and FIG. 10 is an electric circuit diagram. IO...Inner rotor type synchronous motor, 11...Rotation transmission mechanism, 12A, 12B...Rotor, 13A, 1
3B...Stake, 15A, 15B...Rotor body, 23.23A+~23A4.23B+~23B4・
・Hollow drum type stator body, 24.24A+~24
A4.24B+~24B4...Winding, 25a, 2
5 b - Yoke band, 25A, 25B - Stator yoke, 32... Flange piece, 33... Strip-shaped magnetic pole piece, 34
... Squirrel-shaped magnetic pole member, 35 ... Insulating connection member.

Claims (1)

[Claims] A stator that is fitted concentrically to a cylindrical rotor of a synchronous motor, and the stator includes a hollow drum-shaped stator body consisting of a body and flanges at both ends thereof, and a winding wound around the stator body. The stator body consists of a pair of squirrel cage magnetic pole members and an insulating connecting member that connects them in a non-contact state. A collar piece having a plurality of magnetic pole piece attachment protrusions protruding inwardly in the radial direction at regular intervals on the inner peripheral edge thereof, and a collar piece made of a high magnetic permeability material and each formed into a belt shape and an arcuate cross section. In a synchronous motor comprising the same number of magnetic pole pieces as the above-mentioned protrusions, these magnetic pole pieces are arranged to form a cylinder, and one end face of each is welded to one side of each magnetic pole piece attachment protrusion on the above-mentioned collar piece. stator.