JPS596120Y2 - Winding structure of slotless motor - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a winding structure for a slotless motor.

The winding structure of a slotless motor is to form the winding by winding the conductor in a coil, and then attach the winding frame to the iron core using adhesive etc. so that the winding is located within the magnetic gap. There is something that has forced me.

Such a winding structure requires a large number of man-hours and has drawbacks such as the winding being easily misaligned during the work of attaching the winding frame.

There is also a winding structure in which guides are formed at a predetermined pitch on both ends of the iron core in the circumferential direction, and a conductor is wound around the guides to form a winding.

Such a winding structure has disadvantages in that the wire tends to swell during the winding operation, and the winding requires finishing work because the magnetic gap between the magnet and the iron core is narrow.

An object of the present invention is to provide a winding structure for a slotless motor that eliminates the above-mentioned drawbacks.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of an embodiment of a slotless motor having a winding structure according to the present invention.

In the figure, 1 is a bearing 3 fixed to a stator base 2.
The rotating shaft 1 is rotatably held by the rotating shaft 1.
A rotating member 4 is fixed to.

A first annular magnet 5 whose inner wall is magnetized so that different magnetic poles are arranged alternately is fixed to this rotating member 4, and a second annular magnet 6 is arranged in a predetermined magnetic gap with the first annular magnet 5. The outer wall of the annular magnet 5 is magnetized and fixed so that the magnetic poles different from those of the first annular magnet 5 face each other.

A winding structure 7 is arranged within the magnetic gap between the first annular magnet 5 and the second annular magnet 6.

Note that 8 is a Hall element provided for detecting the rotational position, and 9 is a magnet 10 for detecting the rotational speed of the motor and a printed circuit board 1 on which conductive wires are printed and wired.
1 is a rotational speed detection means.

The winding structure 7 according to the present invention includes a pair of opposing guide plates 1.
2 a and 12 b and fixed to the stator base 2 in an annular manner, windings 13 wound around the plurality of hobbins 12 , and the pair of bobbins 12 at the upper ends of the plurality of bobbins 12 . It consists of an annular member 14 fitted between guide plates 12a and 12b.

The winding 13 is wound around n (n = 1.2...) bobbins 12 in advance to form m phases (m = 1, 2...).
・) Crops are divided.

As shown in FIG. 2a, the bobbin 12 includes, for example, the above-mentioned pair of guide plates 12a and 12b, a shaft 12C connecting the pair of guide plates 12a and 12b, and a pair of legs 12d and 12e. The winding 13 is formed by winding the conducting wire so as to be held between a pair of guide plates 12a and 12b.

As shown in FIG. 1, the bobbin 12 on which the second winding wire is wound is positioned approximately in the middle of the magnetic gap between the first annular magnet 5 and the second annular magnet 6, and at a predetermined pitch. It is fixed to the stator base 2 in an annular manner with screws or the like.

A plurality of bobbins fixed annularly to the stator base 2 are
Having a predetermined height tends to cause misalignment of the upper end, so the upper end is not necessarily annular.

Therefore, by fitting an annular member 14 having a protrusion 14a that can be inserted between a pair of guide plates 12a and 12b as shown in FIG. 2b onto the upper end of the bobbin 12, a plurality of bobbins can be The upper end portion is also reliably annular.

Therefore, the first annular magnet 5 and the winding 1 in the magnetic gap
The distance between the third or second annular magnet 6 and the winding 13 is preferably substantially uniform.

In the above embodiments, a slotless motor having a configuration in which a pair of annular magnets rotates with a winding sandwiched therebetween has been described. Of course, it is possible.

As described in detail above, according to the winding structure according to the present invention, the winding can be easily made and the winding can be accurately positioned within the magnetic gap.

A slotless motor using such a winding structure can reduce torque ripple due to switching position compared to a conventional slotless motor because the winding position within the magnetic gap is accurate.

Therefore, such a winding structure is suitable for a winding structure of an ultra-low speed direct drive motor, and is particularly suitable for use in a direct drive motor that drives a turntable of a player, a capstan of a tape deck, a reel of a tape stick, etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of a slotless motor having a winding structure according to the present invention, FIG. 2a is a perspective view of an example of the bobbin in FIG. 1, and FIG. 2b is an annular member in FIG. It is a perspective view of an example. Explanation of symbols of main parts 2... Stator pace, 4... Rotating member, 5, 6... Annular magnet, 12... Bobbin, 13...・・・Winding wire,
14... Annular member.

Claims (1)

[Scope of utility model registration request] The winding structure of a slotless motor includes a plurality of bobbins having a pair of opposing guide plates and fixed to a stator base in an annular shape, a winding wound around the plurality of bobbins, and a plurality of the windings. 1. A winding structure for a slotless motor, comprising: an annular member fitted between the pair of guide plates at the upper end of the bobbin.