JP2007049807A - Permanent magnet type motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a permanent magnet type motor that can easily be manufactured at low cost, and is high in efficiency, high in performance, and reduced in the size of the motor. <P>SOLUTION: The permanent magnet type motor is constituted of a rotor having permanent magnets, and a stator that is arranged at the circumference of the rotor and rotates the rotor by an electromagnetic force. The stator is a connected body formed of a plurality of stator blocks having teeth that are applied with coil concentrated windings, the stator block is formed by alternately laminating and fixing two kinds of shapes of electromagnetic steel plates at each fixed number of pieces, and the teeth are applied with skews since the electromagnetic steel plates are laminated and fixed in an oblique direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator block and a stator structure of a permanent magnet motor.

  In conventional permanent magnet motors, a stator core structure with moving parts has been adopted to meet the demands for smaller and more efficient machine room-less elevators and energy saving trends. This makes the winding work easier and improves the winding space factor. As its structure, core pieces are formed by alternately laminating two types of core members formed by press punching, and the core members are fitted with projections and recesses that serve as connecting means between the core pieces. Some joint portions are provided, and between the core pieces can be rotated by this fitting portion to form an annular stator core. (For example, patent document 1). In order to improve the riding comfort of the elevator, a magnet skew is applied by shifting a permanent magnet to the rotor, and a slot skew is applied to the stator core side of the stator to reduce torque ripple.

Japanese Unexamined Patent Publication No. 2000-201458 (Nos. 5-6, FIGS. 1-6)

  In a conventional permanent magnet motor, when magnet skew is applied to the rotor, it is necessary to attach at least two magnets per pole, which is disadvantageous in reducing the number of parts and simplifying the attaching process. It was. Further, in order to perform magnet skew, the rotor magnets must be shifted and pasted, which makes the positioning process complicated and multi-step, which is a disadvantageous structure for reducing manufacturing costs. In addition, when slot skew is applied to the stator side, the stator core structure has no moving parts, and the coil wound around the skew slot mold is inserted, making winding work and coil insertion work difficult. In addition to this, it was a disadvantageous structure for improving the winding line factor.

  The present invention has been made to solve the above-described problems, and provides a motor for a permanent magnet that can be manufactured more easily and at low cost, and has a highly efficient, high-performance, and compact structure. .

  The permanent magnet motor according to the present invention is composed of a rotor having a permanent magnet and a stator that is disposed around the rotor and rotates the rotor by electromagnetic force. The stator block is formed by alternately laminating and fixing two types of electromagnetic steel sheets every predetermined number, and the electromagnetic steel sheets are inclined. The teeth are skewed by being laminated and fixed.

  According to the present invention, a highly efficient and miniaturized permanent magnet motor can be manufactured more easily and at low cost, and torque ripple can be reduced.

Embodiment 1 FIG.
FIG. 1 is a plan view of a stator of a permanent magnet motor according to Embodiment 1 of the present invention, FIG. 2 is an enlarged view showing a connection portion between a plurality of stator blocks constituting the stator of FIG. 1, and FIG. 1 is a perspective view, FIG. 4 is a rear view seen from the direction A in FIG. 3, FIG. 5 is a plan view showing two types of electromagnetic steel sheets, and FIG. 6 is a front view showing the electromagnetic steel sheets with a ring for connecting pins in FIG. 7 is a perspective view showing a method of stacking and fixing two types of divided stator blocks, FIG. 8 is a perspective view showing a method of connecting the two types of divided stator blocks, and FIG. 9 is a diagram showing a plurality of connections. FIG. 6 is a perspective view showing two types of stator blocks.
In the drawing, 1 is a stator of a permanent magnet motor, and 1a is a fitting portion of a rotor (not shown) having a permanent magnet. 2a and 2b are two types of electrical steel sheets of the same shape punched by two types of split molds, as shown in FIG. 5, T-shaped with a head having an arc shape and fixed to the body. A plurality of pin holes 3 are provided at equal intervals. Reference numeral 4 denotes a pair of connecting pin rings integrally connected to the outer peripheral sides of both ends of the head of the electromagnetic steel sheet 2a. When viewed from the front as shown in FIG. 6, each ring surface has an angle θ relative to the horizontal direction. It is bent so that The electromagnetic steel plate 2b is not provided with the connecting pin ring 4, and this portion is an L-shaped notch, so that the electromagnetic steel plates 2a adjacent to each other as shown in FIGS. 2b is configured to be fitted at both ends of the head. 5a and 5b are two types of stator blocks that are alternately connected to each other. The magnetic steel plates 2a and 2b are alternately laminated and fixed every predetermined number of times, and are composed of a core back portion 6 and a teeth portion 7. . The core back part 6 and the teeth part 7 are comprised by the circular arc shaped head and trunk | drum of electromagnetic steel plates 2a and 2b by which lamination was fixed. Here, as shown in FIG. 4, the side surfaces of both ends of the core back portion 6 become connecting surfaces of the stator blocks 5a and 5b, and the electromagnetic steel plates 2a and 2b are obliquely shifted so as to have an angle θ with respect to the vertical direction. Thus, the teeth 7 are skewed. Further, the teeth 7 are provided with the concentrated coil windings 13 shown in FIG. 1 and a current flows, whereby the stator blocks 5a and 5b become electromagnets, and the rotor having permanent magnets is rotated. Here, the two types of stator blocks 5a and 5b are classified according to the order in which the electromagnetic steel plates 2a and 2b are stacked. That is, the stator block 5a is formed by repeatedly laminating two electromagnetic steel plates 2a and four electromagnetic steel plates 2b in this order from the top or bottom, and the stator block 5b is electromagnetically coupled from the top or bottom. Three steel plates 2b, two electromagnetic steel plates 2a, and one electromagnetic steel plate 2b are repeatedly laminated in this order. Reference numeral 8 denotes a fixing portion for fixing the stator blocks 5a and 5b, which is a through hole that is formed by the fixing pin holes 3 of the plurality of electromagnetic steel plates 2a and 2b and is inclined with respect to the vertical direction. Reference numeral 9 denotes a fixing pin made of a magnetic material that is inserted into the fixing portion 8, and ring-shaped plates 10 are welded to both ends, and the shapes of the stator blocks 5a and 5b stacked as described above are held and fixed. To do. 11a and 11b are connected bodies that are provided on the outer peripheral side of the side surfaces of both ends of the core back portion 6 and are composed of two types of shapes constituted by the connection pin rings 4 of the plurality of electromagnetic steel plates 2a. It is determined by the stacking order of the electromagnetic steel plates 2a and 2b constituting the stator blocks 5a and 5b. A connection pin 12 made of a magnetic material is engaged with the connection pin ring 4 of the connection bodies 11a and 11b. Here, as shown in FIG. 4, the connecting pin ring 4 is provided with an angle θ, whereby the ring surface of the connecting pin ring 4 is perpendicular to the connecting surfaces of the stator blocks 5a and 5b. In addition, due to the shape of the connecting bodies 11a and 11b, when the connecting surfaces of the stator blocks 5a and 5b are in contact with each other, the connecting bodies 11a and 11c are engaged, and the connecting pin rings 4 are all opposed in parallel, The directions are all in one line, and the connecting pins 12 are inserted through these at an angle θ with respect to the vertical direction. Further, by this, the adjacent stator blocks 5a and 5b are movably connected in the rotation direction with the connecting pin 12 as an axis, so that the teeth portion 6 can be opened. Further, the plurality of connected stator blocks 5a and 5b are connected in a circle as shown in FIG. 3, and constitute a stator 1 of a permanent magnet motor. Moreover, the stator core 1 made into one circle is molded (not shown).

  Next, a method for assembling the stator 1 of the permanent magnet motor will be described. First, a plurality of electromagnetic steel plates 2a and 2b are punched and created by using two types of split molds. Next, the electromagnetic steel plates 2a and 2b are laminated and formed so as to be the stator blocks 5a and 5b. Next, the fixing pins 9 are inserted into all of the plurality of fixing portions 8, the ring-shaped plates 10 are fitted to both ends of the fixing pins 9, and the fixing pins 9 and the ring-shaped plates 10 are welded while pressing the fixing pins 9, thereby fixing the stator. The blocks 5a and 5b are connected and fixed (see FIG. 7). Next, the connecting bodies 11a and 11b are meshed with each other and the connecting pins 12 are inserted into a plurality of connecting holes (see FIG. 8), whereby the stator blocks 5a and 5b are alternately and continuously connected to form the stator core 1. Next, the stator blocks 5a and 5b are rotated around the connecting pin 12 so that the tooth portion 7 is opened (see FIG. 9), and the coil winding 13 is applied to the tooth portion 7 in this state. Next, the stator blocks 5a and 5b are rotated backward again around the connecting pin 12 to form one circle, and the connecting bodies 11a and 11b at opposite ends are connected and fixed (see FIG. 3). Next, the stator core 1 is molded.

  Here, the stator blocks 5a and 5b are spirally inserted in the state where the teeth portion 7 is opened because the connected connecting pins 12 are inserted obliquely, but there is no problem in the coil winding work.

  In the permanent magnet type motor configured as described above, the number of parts can be increased by creating a configuration in which the electromagnetic steel plates 2a and 2b punched by two types of split dies are alternately stacked and skewing the teeth portion 7. Reduction, simplification of the pasting process, and simplification of the machining process of the rotor.

  Further, since the magnetic steel plates are fixed with the fixing pins 9, the magnetic steel plates can be firmly fixed.

  At the same time, the skew angle can be held in the teeth portion 7 of the stator block 1, so that a torque ripple reduction effect can be realized.

  Further, the torque ripple is reduced by applying the magnet skew by pasting the magnet of the rotor in a shifted manner, but this is no longer necessary, and the process of pasting the magnet to the rotor can be simplified. Conventionally, it has been necessary to attach at least two magnets per pole for the above reasons, but one magnet is sufficient.

  Further, the torque ripple can be reduced by making the flow of magnetic fluxes in the teeth portion 7 and the core back portion 6 smooth by using the fixing pins 9 and the connecting pins 12 as magnetic bodies.

  Furthermore, by connecting the connecting portions of the core back portions 6 of the stator blocks 5a and 5b with connecting pins and making them movable, it is possible to improve the coil winding work and improve the winding space factor.

  In addition, if the stator 1 is molded after making it one circle, it can be expected that the temperature rise of the winding portion is suppressed by the heat dissipation effect of the molding material.

  By the way, in the above description, in the stator blocks 5a and 5b of the present invention, the stacking order of the electromagnetic steel plates 2a and 2b is as described above, but it goes without saying that other stacking orders can be used. Nor.

It is a top view of the stator of a permanent magnet type motor. It is an enlarged view which shows the connection part of several stator blocks which comprise the stator of FIG. FIG. 2 is a perspective view of FIG. 1. It is the rear view seen from the A direction of FIG. It is a top view which shows two types of electromagnetic steel plates. It is a front view which shows an electromagnetic steel plate with the ring for connecting pins. It is a perspective view which shows the fixing method of two types of divided | segmented stator blocks. It is a perspective view which shows the connection method of two types of divided | segmented stator blocks. FIG. 6 is a perspective view showing a plurality of two types of stator blocks connected to each other.

Explanation of symbols

1 Stator,
2a, 2b electrical steel sheet,
3 fixing pin holes,
4 Ring for connecting pin,
5a, 5b Stator block,
6 Core back part,
7 Teeth club,
8 fixed part,
9 Fixing pin,
10 Ring-shaped plate,
11a, 11b linked body,
12 connecting pins,
13 Coil concentrated winding.

Claims (7)

A rotor having permanent magnets;
A stator that is arranged around the rotor and rotates the rotor by electromagnetic force;
Consists of
The stator is a connected body of a plurality of stator blocks having teeth portions on which concentrated coil winding is performed, and the stator block is formed by alternately laminating and fixing two types of electromagnetic steel plates every predetermined number. The teeth are skewed by the electromagnetic steel plates being laminated and fixed in an oblique direction with respect to the vertical direction.   2. A permanent magnet motor according to claim 1, wherein the lamination and fixing of the electromagnetic steel sheet in an oblique direction is performed by a fixing pin that is inserted in an oblique direction through a fixing pin hole provided in a tooth portion of the electromagnetic steel sheet.   The stator block connecting means includes any one of two types of electromagnetic steel plates constituting the stator block, and a ring for connecting pins provided at both ends of the core back portion of the stator block, and the adjacent stator The permanent stator according to claim 1, wherein the stator blocks adjacent to each other are movably connected to each other by being configured by a connecting pin that is inserted through the connecting pin ring between the blocks. Magnet motor.   The ring for connecting pins is bent so that the ring surface has an angle with respect to the horizontal direction, and the connecting pins are movably connected to each other by inserting the ring for connecting pins obliquely. The permanent magnet motor according to any one of claims 1 to 3, wherein   The permanent magnet motor according to any one of claims 1 to 4, wherein the fixing pin and the connecting pin are made of a magnetic material.   The permanent magnet type according to any one of claims 1 to 5, wherein the stator is molded as a whole in which concentrated winding of a coil is applied to a tooth portion and the stator block is connected to one circle. motor.   The permanent magnet motor according to claim 1, wherein the permanent magnet motor is used for an elevator.

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