JPS6122732A - Toothform pole fastening structure - Google Patents

Abstract

PURPOSE:To facilitate an assembling work by providing a plurality of keyways at the prescribed position on a toothform pole, and selectively assembling the keyways to be engaged with keys. CONSTITUTION:A toothform pole 11 has 25 teeth 13 formed at an equal interval in the circumferential direction on the outer periphery, and a hole 14 for press- fitting to a rotor shaft 12 at the center. Three keyways 15-17 of the same shape are formed at the prescribed positions on the wall of the hole 14. On the other hand, keys 18 to be engaged with the keyways 15-17 are provided on the shaft 12. The keyways 15-17 of the pole 11 are sequentially selected and engaged with the keys 18 to secure the first phase to fourth phase toothform poles 111-114 at the phase difference of 90 deg.. Thus, the assembling work can be facilitated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rotary pulse motor C, and in particular, it is possible to easily assemble tooth-shaped magnetic poles of each phase having the same shape with a predetermined phase difference. This invention relates to a toothed magnetic pole fixing structure.

As shown in Fig. 5, a rotary pulse motor has a multi-phase rotor-side tooth-shaped magnetic pole 2 in which a large number of first teeth 1 are formed at equal intervals in the circumferential direction (only one tooth is shown in the figure). )
and inner periphery L: a plurality of stator-side tooth-shaped magnetic poles having a plurality of second teeth facing the teeth @1 on the outer circumferential side and formed at equal intervals in the circumferential direction L2 and the first teeth. The toothed magnetic poles of each phase face each other with a predetermined phase difference. The rotor equipped with toothed magnetic poles on the rotor side has the first. A magnetic flux is generated by a predetermined excitation method through the second tooth (it is rotated by two directions). Note that 3 is a hole for press-fitting the rotor shaft (tooth-shaped magnetic pole holding member).

[Conventional technology]

Conventionally, the above-mentioned phase difference has been provided using an assembly jig, and the toothed magnetic poles 2 have been fixed by being press-fitted onto the rotor shaft.

[Problem that the invention seeks to solve]

However, this assembly jig requires high precision and is very expensive. Furthermore, in the fixed structure as described above, the toothed magnetic poles move during use of the motor, and the phase difference provided with the angle shifts, resulting in a decrease in motor performance.

[Means for solving problems]

The purpose of the present invention is to provide a toothed magnetic pole V constant structure that can solve the above-mentioned problems. A key is provided, and a plurality of key grooves that can be engaged with the key are formed in the press-fit side circumferential wall of each phase toothed magnetic pole in the same arrangement, and the arrangement of each key groove is as follows:
The toothed magnetic poles of each phase are set to be assembled with a predetermined phase difference by engaging one of the key grooves with a key of the magnetic pole holding member when press fitting the toothed magnetic poles of each phase into the magnetic pole holding member. The configuration is adopted.

[Operation] When assembling the toothed magnetic poles of each phase, the desired phase difference is obtained by engaging the predetermined key groove of each toothed magnetic pole with the key of the magnetic pole holding member. is not necessary. Each toothed magnetic pole may have the same shape.

[★Example]

The present invention will now be described in detail with reference to FIGS. 1 to 4.

In the present invention, a key is provided on the rotor shaft into which each phase toothed magnetic pole on the rotor side is press-fitted and fixed, or on a yoke into which each phase toothed magnetic pole on the stator side is press-fitted, and a plurality of keys are provided in the same arrangement on the press-fit side peripheral wall of each toothed magnetic pole. By providing a keyway and selecting a combination of the key and the keyway that engages with the key, each phase tooth shaped magnetic pole can be assembled with a predetermined phase difference (
It's two. Next, an example thereof will be described.

A first embodiment is shown in FIGS. 1 to 3. In this example, three keyways are provided on the inner wall of the toothed magnetic pole on the rotor side. Figure 1 is a front view of the toothed magnetic pole 11, and Figure 2 is a front view of the toothed magnetic pole 11.
The figure is an explanatory diagram of the assembly procedure for each phase tooth-shaped magnetic pole, and FIG. 6 is a front view of the rotor shaft 12.

The toothed magnetic pole 11 has 25 teeth 13 formed at equal intervals in the circumferential direction on its outer periphery, and a hole 14 in the center for press-fitting into the rotor shaft 12. Six key grooves 15, 16, 17 having the same shape are formed in a predetermined arrangement on the wall surface of the hole 14. These keyways are for assembling a four-phase toothed magnetic pole with a phase difference of 90° using four toothed magnetic poles 11.
A line 0-0 connecting the boundary A between the convex part and the concave part and the center O of the hole 14
．． The center of the keyway is located at the top, and the keyway 1
6 and 17 are the lines 0 passing through the center O and perpendicular to the line 0-01.
The center of the keyway is located on 2-03. The line 02-03 passes through the center of the tooth protrusion on the left side of the center O, and passes through the center of both recesses on the right side of the center O.

On the other hand, the rotor shaft 12 has key grooves 15 , 16 , 17 .
A key 18 is provided which can be engaged by the user.

The four-phase toothed magnetic pole is constructed by press-fitting and fixing four toothed magnetic poles 11 onto the rotor shaft 12 by the following procedure.

For convenience, the tooth-shaped magnetic poles of each phase are 111, 112, and 11.
5 s 11a.

That is, first, the tooth-shaped magnetic pole 111 of the first phase is
While maintaining this state, press fit the rotor shaft 12 shown in FIG.

Next, the second phase tooth-shaped magnetic pole 112 is placed in the state shown in FIG. 2(A) (
Rotate 180 degrees around the line 0-01 from the state shown in Figure 1 (α) and turn it over), press fit it into the rotor shaft 12 in the same way, and engage the keyway 15 and key 18. and fix it. In this case, the toothed magnetic pole 112 is the toothed magnetic pole 11
1 with a phase difference of 180°. To explain this in detail, if we consider the clockwise direction,
In the state shown in FIG. 2 (α), that is, in the state shown in FIG.
In the state shown in Fig. 2(b), the center of the keyway 15 is opposite to the boundary where the tooth transitions from the concave part to the convex part (because the tooth-shaped magnetic pole is turned inside out), and this boundary is the same as that seen in Fig. 1. In this case, the situation is the same as that of A' directly below the center O. Since A and A' are shifted by 1800, there is a gap of 1800 between the toothed magnetic poles 11+ and 112.
This results in a phase difference of .

Next (2nd, 6th phase toothed magnetic pole 113 is in the state shown in FIG. 2(C) (FIG. 2(cL))
290° phase difference) and keep this at ζ
It is press-fitted into the rotor shaft 12, and the key groove 16 and key 18 are engaged and fixed. In this case, the toothed magnetic poles 113 are fixed with a phase difference of 90° clockwise relative to the toothed magnetic poles 111 (two).

Finally, the fourth phase tooth-shaped magnetic pole 114 is held in the state shown in FIG. ,
The state of the toothed magnetic pole 114 in FIG. 2(d) is that the toothed magnetic pole 11b'lRO ('1) in FIG.
It is fixed with a phase difference of (90°+180°−270°) in the clockwise direction.

In this way, by selectively assembling and engaging the key and the three keyways, it is possible to accurately and easily construct the C24-phase toothed magnetic pole without the need for an assembly jig.

FIG. 4 shows a second embodiment.

In this example, six keyways are provided on the outer periphery of the toothed magnetic pole on the stator side, and FIG. 4 is a front view of the toothed magnetic pole 1 on the stator side. The five-toothed magnetic pole 21 has teeth (two opposing teeth 22) on the inner wall of the rotor-side toothed magnetic pole, and three keyways 23, 24, 25 on the outer periphery (two keyways 2).
3, 24, and 25 are formed in a predetermined arrangement as in the previous example, and a key 27 is provided on the yoke 26 on the stator side shown by the chain line in the figure.

In the case of this example as well, by assembling the four toothed magnetic poles 21 in the same manner as shown in FIG. 2, a four-phase toothed magnetic pole with a phase difference of 90' can be obtained.

〔Effect of the invention〕

As described above, according to one aspect of the present invention, a magnetic pole holding member (rotor shaft or yoke) is provided with a C key, and a plurality of key grooves are provided in a predetermined arrangement on each toothed magnetic pole that is press-fitted into the magnetic pole holding member. By selecting the combination of the key and the keyway that engages with the key, each toothed magnetic pole can be assembled with a predetermined phase difference, so the high precision assembly jig that was conventionally required is omitted. It is extremely easy to assemble. In addition, each toothed magnetic pole is keyed (locked in the rotational direction from the second l/), so
The phase difference will not shift during use.

The present invention can also be applied to a rotary pulse motor having a configuration other than the above-described embodiment, for example, a type in which common teeth are formed on the inner wall of the yoke 1 and 2 for each phase, and these are used as tooth-shaped magnetic poles. A keyway is formed in each toothed magnetic pole on the rotor side.

[Brief explanation of drawings]

1 to 4 show embodiments of the toothed magnetic pole fixing structure according to the present invention (second embodiment), and FIG. 1 is a front view of the toothed magnetic pole on the rotor side of the first embodiment, and FIG. 2 (α) , (h)1 (
CI, (cL) is an explanatory diagram of the procedure for assembling the toothed magnetic poles of each phase, FIG. 6 is a front view of the same rotor shaft, and FIG. 4 is a front view of the toothed magnetic poles on the stator side of the second embodiment. FIG. 5 is a front view of a conventional toothed magnetic pole on the rotor side. In the figure, 11.21 is a toothed magnetic pole, 12 is a rotor shaft (magnetic pole mounting member), 13.22 is a tooth, 14 is a hole, 15, 16
. 17.25.24.25 is the keyway, 18.27 is the key,
26 is a yoke (magnetic pole attachment member).

Claims (1)

[Claims] A multi-phase rotor-side tooth-shaped magnetic pole in which a large number of first teeth are formed at equal intervals in the circumferential direction on the outer periphery, and a large number of second teeth opposite to the first teeth are formed in the inner periphery in the circumferential direction. In a rotary pulse motor comprising the first tooth and a plurality of phases of stator-side tooth-shaped magnetic poles formed at equal intervals, a key is provided on a magnetic pole holding member into which the tooth-shaped magnetic poles of each phase on the rotor side or the stator side are press-fitted. In addition, a plurality of key grooves that can be engaged with the key are formed in the press-fit side peripheral wall of each phase tooth shaped magnetic pole in the same arrangement, and the arrangement of each key groove is a combination of the key to be engaged and the key groove. A tooth-shaped magnetic pole fixing structure characterized in that the tooth-shaped magnetic poles of each phase are assembled with a predetermined phase difference by selecting the following.