JP2000245124A - Smooth core armature wound motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smooth core armature wound motor capable of reducing cogging torque and being manufactured easily. SOLUTION: This smooth core armature wound motor is provided with an armature 2, involving a plurality of coils 4 for rotary electromagnetic formation on the inner or outer peripheral surface of a cylindrical slotless armature core 3, a p-pole of a permanent magnetic type rotor 9 which is disposed rotatably via the coil 4 and a gap G, and a frame 7 on the other side of the coil disposed surface on the armature core 3, wherein (q) of protrusions 5 which is relatively prime to the number (p) of poles of the permanent magnetic 10 are disposed on the opposing surface on the frame of the armature core 3 at regular intervals, and a recessed part 8 is also disposed so as to match with the shape of the protrusion 5 on the opposing surface to the protrusion 5 on the frame 7, so that the protrusion 5 and recessed part 8 are engaged for fixing the armature core 3 to the frame 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smoothing electric machine in which a coil for forming a rotating magnetic field is mounted on an annular armature core having no slot, and a permanent magnet rotor is provided through the coil and a gap. The present invention relates to a child winding type motor.

[0002]

2. Description of the Related Art Smooth armature winding type motors are characterized in that no cogging torque is generated and the armature reaction is small because of a large magnetic gap as compared with a slot type motor. Therefore, it has been applied to applications requiring lower torque ripple and higher peak torque than before. The conventional framed armature wound-type motor with a frame is composed of a plurality of coils for forming a rotating magnetic field, which are molded to match the inner peripheral shape of an annular armature core formed by laminating thin plate-shaped cores. ,
A positioning jig is disposed at a predetermined position on the inner peripheral surface of the armature core via an insulating layer, and the periphery of the coil is molded with a resin to be integrated with the armature core. The armature core is fitted and fixed to the frame, but the outer peripheral surface is finished to a smooth surface by lace processing or the like so as not to be disengaged, and shrink-fit to the inner peripheral surface of the cylindrical frame. A fitting method such as hitting a plurality of detent pins after firmly fitting or bonding to the inner peripheral surface of the frame is adopted. In addition, the coil is connected so that a predetermined number of poles is formed, and at both ends of the frame,
The bracket on the load side and the bracket on the non-load side are fixed by means such as screws. A rotor rotatably supported by bearings is provided on the brackets on the load side and the non-load side, and a plurality of rotors are provided on the surface of the rotor so as to face the coil via a mechanical gap. The permanent magnets are fixed so as to have mutually different polarities.

[0003]

As described above, a characteristic of the smooth armature winding type motor is that no cogging torque is theoretically generated. However, when the frame and the armature core are fixed to each other by shrink fitting, the deformation of the frame at the time of processing the frame extends to the armature core, and the armature core is deformed into an elliptical shape. There is a problem that cogging torque is generated several times during the operation. In addition, the method of fixing the armature core to the frame by using both bonding and pinning has a problem that the production is troublesome and the number of working steps increases. The present invention has been made to solve such a problem,
It is an object of the present invention to provide a smooth armature winding type motor having a small cogging torque and easy to manufacture.

[0004]

In order to solve the above-mentioned problems, the present invention comprises a plurality of coils for forming a rotating magnetic field mounted on the inner or outer peripheral surface of a cylindrical slotless armature core. A smooth armature winding type comprising: an armature; a p-pole permanent magnet rotor rotatably disposed via a gap between the coil and the coil; and a frame provided on a side opposite to a coil arrangement surface of the armature core. In the motor, q projections having a prime relationship with the pole number p of the permanent magnet are provided at equal intervals on the frame-facing surface of the armature core, and projections are formed on the surface of the frame facing the projections. A recess is provided according to the shape, and the armature core and the frame are fixed by fitting the projection and the recess. By doing so, the armature core can be securely fixed to the frame, and cogging due to deformation of the core can be reduced without applying a large stress to the armature core cylindrical portion. Further, the number of steps can be reduced without the need to hit a pin.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 is a front sectional view showing a first embodiment of the present invention. This embodiment shows an example in which the present invention is applied to a three-phase, eight-pole, six-coil inner rotor type smooth armature winding type motor. In the figure, 1 is a smooth armature winding type motor, 2 is an armature, which has an armature core 3 and a coil 4. The armature core 3 is formed by laminating thin plate-shaped cores punched from an electromagnetic steel plate, and is provided with q protrusions 5 at equal intervals on the outer peripheral portion, in this embodiment, 11 protrusions 5. . The projections 5 are provided integrally when punching a thin electromagnetic steel sheet to form an iron core. In general, the order of cogging torque is the least common multiple of the number of poles and the number of slots,
In the present invention, it is considered that cogging occurs at the least common multiple of the number of protrusions and the number of poles of the armature core 3. In general, the higher the order, the smaller the amplitude of the cogging torque becomes.
The number q of the projections 5 provided on the outer periphery of the armature core 3 is set to be relatively prime to the number of poles p. In this embodiment, the order of cogging is 88th. The central portion of each projection 5 is caulked, and the core is temporarily fixed by caulking simultaneously with the punching of the electromagnetic steel sheets, and the iron cores are laminated so as to have a predetermined thickness. At this time, the core constituting the armature core 3 is
You may make it rotate and pile by pi / q (rad).
The coil 4 mounted on the inner peripheral surface of the armature core 3 is aligned and wound using a rectangular wire or a round wire so as to have a predetermined number of turns, and makes clean surface contact with the inner peripheral surface of the armature core 3. It is molded as follows. Six coils 4 are arranged at equal intervals on the inner peripheral surface of the armature core 3 with an insulating layer 6 interposed therebetween.
The wires are connected in the order of W phase, V phase, U phase, W phase, and V phase. Thereafter, the coil 4 is fixed to the inner peripheral surface of the armature core 3 with resin. The frame 7 is made of an aluminum alloy, and is fixed to the projection 5 of the armature core 3 and the recess 8 of the inner peripheral surface of the frame 7 by shrink fitting so as to form a body. The inner diameter of the frame 7 is the armature core 3
Of the armature core 3 is not deformed by shrink fitting even when the frame 7 is not a perfect cylinder. A load-side bracket and a non-load-side bracket (not shown) are fixed to both ends of the frame 7 by means such as screws.
Further, a rotor 9 rotatably supported in the axial direction by a bearing (not shown) is provided on the load side and the non-load side bracket, and on the surface of the rotor 8,
Eight permanent magnets 10 are fixed to be opposite to each other so as to face the coil 6 via a mechanical gap G. [Second embodiment] Although not shown, in the present invention, the coil 4 is wound around a bobbin so that the armature core 2
It may be mounted on the surface of the. In this case, an insulator is constituted by a bobbin made of an insulating material molded to match the coil shape, and a connecting portion made of a flexible insulating material for connecting the bobbins with each other at a coil pitch, and winding the bobbin. A wire in which wires are aligned and wound a predetermined number of times is mounted on the surface of the armature core 3 and molded with an insulating resin so that the armature core 3 and the coil 4 become a core. By doing so, positioning between the coils can be performed at the connection between the bobbins, and the coil 4 can be accurately and easily mounted. Further, the torque ripple can be reduced by improving the positioning accuracy of the coil 4.

[0006]

As described above, according to the present invention, there is an effect that it is possible to provide a smooth armature winding type motor which has a small cogging torque and a small torque ripple, is easy to manufacture, and can be accurately manufactured.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Smooth armature winding type motor, 2 armatures, 3 armature cores, 4 coils, 5 protrusions, 6 insulating layers, 7 frames, 8 recesses, 9 rotors, 10 permanent magnets, G air gap

Claims (4)

[Claims] 1. An armature having a plurality of coils for forming a rotating magnetic field mounted on an inner peripheral surface or an outer peripheral surface of a cylindrical slotless armature core, and rotatably disposed through the coil and an air gap. In a smooth armature winding type motor having a p-pole permanent magnet rotor and a frame provided on a side opposite to a coil arrangement surface of the armature core, a permanent magnet is provided on a frame-facing surface of the armature core. Q projections having a prime relationship with the number of poles p are provided at regular intervals, and a concave portion is formed on the surface of the frame facing the projection to fit the shape of the projection. A smooth armature winding type motor characterized in that an armature iron core is fixed to a frame by the above method. 2. The armature core is formed by laminating thin plate-shaped iron cores, and the projections of the armature core are caulked to temporarily fix the armature core. 2. The smooth armature winding type motor according to 1. 3. A thin plate-shaped iron core constituting an armature core
The motor according to claim 1 or 2, wherein the motor is wound and piled by π / q (rad). 4. An insulator is formed by a bobbin made of an insulating material formed so as to match a coil shape, and a connecting portion made of a flexible insulating material connecting the bobbins with each other at a coil pitch. A winding wound in a predetermined number of turns is attached to the surface of the armature core,
The motor according to any one of claims 1 to 3, wherein the armature core and the coil are formed by molding with an insulating resin.