JPS60197152A - Hybrid type step motor - Google Patents

Abstract

PURPOSE:To simplify the structure and the mounting of a yoke by providing a yoke on the outside of a pair of coils concentrically with a rotor, extending and opposing pole teeth from the yoke to form the surface in a plurality of rotor pole teeth and a stator. CONSTITUTION:A rotor 8 of a hybrid type step motor is composed by securing a core 11, a yoke 12 and a magnetic flux converging body 13 to a rotational shaft 10, and forming many pole teeth 14 on the periphery of the core 11. A stator 9 is composed by providing a yoke 15 and a permanent magnet 17 in an outer box 1, and further providing stator poles 19 opposed to the core 11. In this case, the pole teeth 26-27' of the stator pole 19 are formed on the surfaces with five teeth in the same shape as the teeth, and displaced at half pitch at the opposed pole teeth and 1/4 pitch at the pole teeth. Thus, a pair of stator coils 23, 23 are difference at 90 deg. in phase, and AC of prescribed frequency is applied to enable to control positioning in high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a hybrid step motor.

[Background technology]

A conventional example is shown in FIG. 1 is a rotor, 2 is a stator, a coil 4 is wound around each magnetic pole tooth flat of the stator 2, and a permanent magnet (not shown) is used to cause the magnetic pole teeth of the rotor 1 to raise the same magnetic pole. The configuration is such that an alternating current with a phase shift of 90 degrees is applied to the motors 4 and 4 to perform stepwise operation.

However, since the stator 2 has a coil 4 wound around each magnetic pole tooth 3 formed of a laminated iron core, the manufacturing process is complicated and costs increase.

[Purpose of the invention]

Therefore, an object of the present invention is to provide a hybrid step motor that can be manufactured easily and at low cost.

[Disclosure of the invention]

The present invention relates to a stator, in which a yoke is provided on the outside of a pair of coils that are concentric with the rotor, and magnetic pole teeth are extended from the yoke to the inside from both ends of the coil so as to cross each other, and are opposed to each other.
The surface of the magnetic pole teeth is made to have the same shape as a plurality of rotor magnetic pole teeth, and the opposing magnetic pole teeth inside each coil are shifted by half a pitch and face the rotor magnetic pole teeth, and the magnetic pole teeth between the coils are aligned with each other. It is characterized by applying alternating current to each coil that faces the rotor magnetic pole teeth with a 1/4 pitch shift and is 90 degrees out of phase.

Compared to the conventional method of manufacturing a stator by winding a coil around each magnetic pole tooth, the stator is manufactured by attaching a yoke to a coil that has been wound around a coil frame in advance, making it extremely simple and inexpensive. Furthermore, since the magnetic pole teeth have the same shape as the rotor magnetic pole teeth, magnetic efficiency related to attraction and repulsion is improved, and stepping operation is ensured.

An embodiment of this invention is shown in FIGS. 2 to 8. That is, 5 is the outer box, 6 is the end bracket, 7 is the bearing, and 8
is a rotor, and 9 is a stator. The rotor 8 has a rotating shaft IO supported by a bearing 7, a rotor iron core 11 laminated in the center of the rotating shaft IO, a rotor yoke 12 on both sides of the rotor core 11, and three magnetic flux collection nets laminated on the outside thereof. 13 are closely fixed to each other. Of these, rotor core 1
1 has a large number of magnetic pole teeth (for example, 50 poles) 14 formed on the circumferential surface with equal widths and intervals. On the other hand, the stator 9 is
A cylindrical stator yoke 15 is provided inside the outer box l, and a gap 16 is provided inside the yoke 15 at a portion facing the magnetic flux collection net 13.
A permanent magnet 17 which can have various shapes such as a ring shape is provided through the rotor core 11, and a predetermined gap 1 is provided facing the rotor iron core 11.
Stator poles 19 are provided via 8 . Among these, the permanent magnet 17 has a magnetic pole in the radial direction, and for example, the magnetic flux collection net 13
The side becomes the N pole, and the side of the stator yoke 15 becomes the S pole.

The stator poles 19 are constructed as follows. That is, as shown in FIG. 4, coils 22 and 23 are wound in arbitrary directions around a pair of coil frames 20 and 21, respectively. For each of these coil frames 20.21, a cork 24.25 is placed around the outer periphery of the coil frame 20.21 including the coil 22.23.
are provided, and the coil frame 20.21 is provided from both sides of the yoke 24.25, that is, from both ends of the coil frame 20.21 in the axial direction.
The magnetic pole teeth 26. 27.26', 27' are bent and extended, and magnetic pole teeth 26.27.26°.

Five teeth are formed on the back surface of the rotor magnetic pole teeth 14 with the same width and the same spacing. And in each yoke 24° 25, opposing magnetic pole teeth 26, 27 and magnetic pole teeth 26°,
27゛ is a half pitch (
The l pitch refers to the distance from one magnetic pole tooth edge to the next magnetic pole tooth edge). Also each coil 22.2
3, that is, between the yaws 41' and 24.25, the magnetic pole teeth 26° 27 and the magnetic pole teeth 26° and 27f are arranged to be shifted by 1/4 pift with respect to the rotor magnetic pole teeth 14.

The stator poles 19 having such a configuration are arranged in the axial direction, the yokes 24.25 are attached to the stator yoke 15, and each of the magnetic pole teeth 26, 27.26', 27'' corresponds to the rotor magnetic pole tooth 1.
4 with a predetermined gap 18.

The operation of this hybrid step motor will be explained. First, the magnetic flux of the permanent magnet 17 passes through the magnetic path indicated by the arrow in FIG. That is, the N pole of the permanent magnet 17, the gap 16,
Magnetic flux collection net 13, rotor yoke 12, rotor iron core 11
, gap 18, magnetic pole teeth 26, 27, 26', 27',
Yoke 24°25, stator yoke 15, permanent magnet 17
is the south pole of As a result, a north pole appears on the rotor magnetic pole teeth 14.

On the other hand, a bipolar or alternating current of a predetermined frequency is applied to the pair of coils 22 and 23, and the electrical angle is 99
The phase is different by 0 degrees. First, considering the coil 22 side, assuming that the magnetic flux generated during a half cycle of AC flows through the yoke 24 as a magnetic path, and inside the coil 22, the magnetic flux flows from the magnetic pole tooth 26 side to the magnetic pole tooth 27 side via a gap, then 26 becomes the north pole, and the magnetic pole tooth 27 becomes the south pole. Therefore, for the remaining half cycles, the relationship is reversed. This relationship also applies to the coil 23 side. Therefore, for example, the relationship between the magnetic pole teeth 26 and 27 and the rotor magnetic pole teeth 14 is shown in FIG.
), in the first half cycle the magnetic pole tooth 2
6 is the S pole, the rotor magnetic pole tooth 14 is the N pole and is attracted, whereas the magnetic pole tooth 27 is the N pole and the magnetic pole tooth 1
Since it is shifted by half a pitch from 4j, it rebounds and remains stable in this state without moving. Next, in the half cycle where the phase is delayed by 90 degrees and the flow flows to the coil 23, if the magnetic pole tooth 26' becomes the S pole and the magnetic pole tooth 27° becomes the N pole, then the magnetic pole tooth 26' is attracted, and the magnetic pole tooth 27
As a result of the repulsion, the rotor 8 moves from the stable state to 1/
It rotates in the 4-pitch direction A and reaches the stable state shown in FIG. 8(b). As described above, the magnetic pole teeth 26', 27'' and the magnetic pole teeth 26
．． 27 is shifted by 1/4 pitch with respect to the magnetic pole teeth 14. Therefore, for the magnetic pole teeth 26□27, this stable state means that the rotor magnetic pole teeth 14 have shifted by 1/4 pitch. Then, in the remaining half cycle of the flow to the coil 22 delayed by 90 degrees after the half cycle of the coil 23, the magnetic pole tooth 26 becomes the N pole and the magnetic pole tooth 27 becomes the S pole, and the attraction and repulsion switch, so that the rotor 8 is further directed. 1/4 to A
Pitch rotation and stability.

Similarly, in the remaining half cycle of the flow flowing to the coil 23 with a delay of 90 degrees, it rotates by 1/4 pitch in the direction A, and as a whole, the rotor rotates by 1 pitch per cycle of both coils 22 and 23. Become. In this way, highly accurate position control is possible by changing the number of applied pulses.

Regarding the rotational direction of the rotor 8, if the direction of half-cycle current flowing through the coil 23 from the stable state shown in FIG. The opposite is true. Also, in the initial stage, Fig. 8 (
In the case of the magnetic pole tooth relationship of a), when the magnetic pole tooth 26 is the N pole and the magnetic pole tooth 27 is the S pole, the phase on the coil 23 side is advanced and the magnetic pole tooth 26' is the N pole and the magnetic pole tooth is 27' is S
When it is a pole, it may rotate within a half-pinch in direction A and in the forward direction.

Note that the magnetic pole teeth 26, 27, 26'', 27' may be formed separately from the yoke 24.25 and then inserted into holes provided in the yoke 24.25. In the case where a permanent magnet is included in the rotor, the relationship between the rotor 8 and the permanent magnet 17 is not limited to the above embodiment, and the same magnetic poles may be formed in the rotor magnetic pole teeth.

〔Effect of the invention〕

As described above, according to the hybrid step motor of the present invention, it is easier to wind the coil than in the conventional case where a coil is wound for each magnetic pole tooth, and the structure and installation of the coke are also simple. can be manufactured at low cost, and since the magnetic pole teeth are formed in the same shape opposite to the rotor magnetic pole teeth, the magnetic efficiency is excellent and the stepping operation is ensured.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a conventional example, Fig. 2 is a sectional view of an embodiment of the present invention, Fig. 3 is a sectional view taken along line mm, and Fig. 4 is an exploded perspective view of the stator and rotor. Figure 5 is an explanatory diagram showing the magnetic path of the permanent magnet, Figure 6 is a partial sectional view of Figure 2,
FIG. 7 is an explanatory diagram showing the relative relationship between the opposing magnetic pole teeth of each coil with respect to the rotor magnetic pole teeth, and FIG. 8 is a developed diagram of the magnetic pole teeth illustrating the stepping operation. 8-Rotor, 9-Stator, 14-Rotor magnetic pole teeth, 7-
・Permanent magnet, 22.23・Coil, 24.25・-Yoke, 26, 27.26', 27'-Magnetic pole tooth Agent Patent attorney Official Akio I [-“:)τ-:'9-i; ′,
l +1:I', ,',,".] Figure 1 Figure 2 0 Rattan Figure 3''10 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A rotor having a predetermined number of rotor magnetic pole teeth formed on its surface, a magnet that causes the rotor magnetic pole teeth of this rotor to generate the same magnetic pole, and a magnet arranged concentrically with the rotor and arranged on each of the rotor magnetic pole teeth. a pair of coils located on the ground and supplied with alternating current having a phase different from each other by 90 degrees, a pair of yokes disposed on the outside of each of these coils, and a pair of yokes extending from these yokes in the axial direction of each of the coils. magnetic pole teeth arranged so as to cross each other with a predetermined gap from both ends of the coil to the inner peripheral side of the coil, and having surfaces formed in the same shape as the plurality of rotor magnetic pole teeth; The magnetic pole teeth facing each other on the inner side are offset by a half pitch and oppose the rotor magnetic pole teeth, and the magnetic pole teeth between the coils are offset by a quarter pitch and oppose the rotor magnetic pole teeth. A no-brid type step motor.