JPS6377369A - Pulse motor - Google Patents

Abstract

PURPOSE:To miniaturize and thin an apparatus by attracting rotor cores fitted in succession in the axial direction of a rotor to each magnetic pole in a stator in a specified order and obtaining continuous revolution as a whole. CONSTITUTION:When currents are caused to flow through coils 9 having phase number of l and II, teeth 3 in the coils 9 are magnetized. Magnetic flux by a permanent magnet 1 and the coils 9 each flows as shown in solid lines and dotted lines among teeth 3 in rotor cores 2 and teeth 8 in stators 10. That is, magnetic flux is intensified mutually in l phase and IV phase, and weakened with one another in II phase and III phase. Consequently, driving torque is generated by suction force among the teeth 3 in the rotor cores 2 having phase number of I and IV and the teeth 8 in the stators 10, and a rotor 5 is turned at the quarter of the pitches of the teeth 3, and stopped by the largest suction force of I phase. II phase is brought to the same state as I phase before opera tion, III phase as II phase, IV phase as III phase and I phase as IV phase. Accordingly, when currents are caused to flow through II phase and IV phase secondly in the same direction as I phase and II phase at that time, the rotor is rotated at the quarter of pitches again. When the operation is repeated contin uously, the rotor 5 is revolved successively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a four-phase vibe lift type pulse motor having a small dimension in one direction perpendicular to the rotation axis.

[Conventional technology]

FIGS. 4(a) and 4(b) are a longitudinal cross-sectional view and a cross-sectional view taken along line A-A of an example of a conventional four-phase hybrid pulse motor, in which 1 is a permanent magnet and 2 is a rotor core. , has teeth 3 formed on the circumferential surface at equal intervals, to which a rotating shaft 4 is fixed, and thus a rotor 5 is configured. Reference numeral 6 denotes a stator iron core on which a magnetic pole 7 is formed, teeth 8 having the same pitch as the teeth 3 are formed on the surface thereof, and a coil 9 is attached to form a stator 10. 11 is a bearing, and 12 is a housing.

Since this operation is well known, it will be briefly described below.

FIG. 5 is a developed model thereof, mainly showing the S pole side of the permanent magnet 1. Greek numerals I and II indicate phase numbers. The teeth 8 are arranged offset from those of the adjacent pole by 1/4 of the tooth pitch. Now, in the state shown in FIG. 5, when a current flows in the direction shown in the coil 9 of the magnetic pole 7 in which the phase numbers are lined up every other time, the teeth 8 are magnetized with the polarity shown in the drawing. Therefore, between the teeth 3 of the rotor core 2 and the teeth 8 of the stator 10, there is a magnetic flux due to the permanent magnet 1 shown by a solid line as shown in the figure.
A magnetic flux by the coil 9 shown by a dotted line flows. As a result, an attractive force is generated at the teeth 8 of the phase numbering where the magnetic flux increases, and the rotor 5 moves 1/4 pitch to the right. Then, the tooth 8 with the coil 9 of the phase number H, through which current did not flow, will have the same positional relationship with the tooth 3 of the rotor 5 as the tooth 8 of the phase number machine before operating, and will perform the same operation as before. It can be carried out. When this is repeated, a suction force always acts between the teeth 8 of any one phase number and the teeth 3 of the rotor 5, and the rotor 5 can continue rotating in one direction.

[Problem to be Solved by the Invention 9] With the structure described above, it is necessary to reduce the diameter of the rotor 5 in order to reduce the diameter of the motor, and as a result, the torque decreases, so it is difficult to reduce the diameter. Ta. Also,
It is relatively easy to reduce the size of the main body in the axial direction of the rotating shaft 4, so-called thinning, and the reduction in torque is commensurate with the reduction in size, so relatively many such products are commercially available. . However, in this type, the rotating shaft 4 requires a certain length to attach gears, etc., so there is little hope for downsizing with conventional pulse motors, where the length of the rotating shaft 4 is the same as the thickness direction of the main body. The problem was that it couldn't be done.

The purpose of this invention is to provide a motor with a form and size that has not been seen before by reducing the dimension in one direction perpendicular to the rotation axis, thereby downsizing various types of equipment.

The purpose is to contribute to thinning.

[Means for solving problems]

The pulse motor according to the present invention has four cylindrical rotor cores made of soft magnetic material. @2. Third. a permanent magnet is arranged between the second rotor core and the third rotor core, and teeth are formed at equal pitches on the circumferential surface of each rotor core; The rotor is placed inside, and the stator has eight magnetic poles each having a coil, facing the rotor on the left and right sides, and the four magnetic poles on the left and right sides of the stator are as follows: A first . 2nd, 3rd. The magnetic poles are arranged and fixed in the order of the fourth, magnetically coupled between the respective magnetic poles, and the first... Second. Teeth having the same pitch as the teeth provided on the rotor are formed on each of the third and fourth magnetic poles, and teeth of the stator magnetic pole or the first and second magnetic poles of the rotor are formed. Second. 3. Either one of the teeth of the fourth rotor core is sequentially arranged and fixed at an angle shifted by 1/4 of the pitch of the teeth in one direction.

[Effect]

In this invention, the rotor core, which is sequentially coated in the axial direction of the rotor, is attracted to each magnetic pole of the stator in a predetermined order,
A continuous rotation is obtained as a whole.

〔Example〕

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 (a
) and (b) are a schematic plan view and a side sectional view thereof. Note that the same reference numerals as in FIG. 4 indicate the same parts.

In these figures, the rotor 5 is made of a soft magnetic material, and has cylindrical first to fourth rotor cores 2-1°2-2.2-3.
．． 2-4 are arranged in the length direction of the rotating shaft 4, and the permanent magnets 1 are interposed between the second rotor core 2-2 and the third rotor core 2-3, and are integrally formed. ing. The teeth 3 of these four rotor cores 2-1.2-2.2-3.2-4 are all formed on their respective peripheral surfaces with the same pinch, but each of the rotor cores 2-1 to 2-4 is The angle is sequentially shifted by 1/4 pitch in one direction.

The stator 10 has eight magnetic poles 7-IA, 7-IB (first magnetic pole 7-1), 7-IB (first magnetic pole 7-1) and 7-IB (first magnetic pole 7-1), which face each other on the left and right sides with the coater 5 placed therein, and are provided with coils 9, respectively.
2A, 7-2B (second magnetic pole 7-2), 7-3A
, 7-3B (third magnetic pole 7-3) and 7-4A.

7-4B (fourth magnetic pole 7-4) is provided. Hereinafter, when referring to magnetic poles generically, 7 will be simply used. The above-mentioned A and B are arranged as a pair on the left and right sides of the rotor 5. Also, on each of the left (A side) and right (B side),
The magnetic poles 7 are magnetically coupled by a yoke or the like. Teeth 8 having the same pitch as the teeth 3 of the rotor 5 are formed on each magnetic pole 7, and unlike the teeth 3, the teeth 8 are provided so as to have the same phase angle without deviation. Note that the housing is omitted in both FIGS. 1 and 2.

This operation will be explained with reference to FIG.

FIG. 3 is an explanatory diagram of the operation of the pulse motor of the present invention, and shows an expanded model. Greek numerals indicate phase numbers.
It is similar to the figure. In the state shown in Fig. 3, when current flows in the direction shown in the coil 9 with phase numbers ■ and H, the tooth 3
is magnetized to the polarity shown. The magnetic fluxes generated by the permanent magnet 1 and the coil 9 flow between the teeth 3 of the rotor core 2 and the teeth 8 of the stator 1Q as shown by solid lines and dotted lines, respectively.

That is, the magnetic fluxes of the 1st phase and the ■ phase strengthen each other, and the magnetic fluxes of the ■ phase and the ■ phase weaken each other. As a result, as explained in Figure 5,
Driving torque is generated by attraction between the teeth 3 of the rotor core 2 of the phase number and the teeth 8 of the stator 1o, and the rotor 5 rotates at a pitch of 1/4 of the teeth 3, and the attraction of the largest phase is Stop by. Then, the ■phase is in the same state as the phase before operation, the ■phase is in the same state as the ■phase, the ■phase is in the ■phase, and the ■phase is in the same state as the ■phase. Therefore, next time, if current is applied to the ■phase and ■phase in the same direction as that applied to the 1st phase and ■phase, the pitch will rotate 1/4 again. If this is repeated continuously, the phase will shift cyclically, and the rotor 5 will rotate continuously. As can be seen from the above explanation, the direction of current in one phase is bidirectional, and as in the past, so-called bipolar drive or unipolar drive using the coil 9 provided with a center tap is used. .

In the above embodiment, the teeth 3 of the rotor cores 2-1 to 2-4 are sequentially shifted, but on the contrary, the teeth 3 of the rotor cores 2-1 to 2-4 are made to have the same phase, Stator 1Q
The teeth 8 of each magnetic pole 7 may be sequentially shifted.

〔Effect of the invention〕

As explained above, this invention has four cylindrical rotor cores made of soft magnetic material. Second. Third. a permanent magnet is arranged between the second rotor core and the third rotor core, and teeth are formed at equal pitches on the circumferential surface of each rotor core; The rotor is placed inside, and the stator has eight magnetic poles each having a coil, facing the rotor on the left and right sides, and the four magnetic poles on the left and right sides of the stator are as follows: A first . 2nd゜3rd. The magnetic poles are arranged and fixed in the order of the fourth, magnetically coupled between the respective magnetic poles, and the first... Second. Third. Teeth having the same pitch as the teeth provided on the rotor are formed on each of the fourth magnetic poles, and the teeth of the stator magnetic pole or the first. Second. Third. Since either one of the teeth of the fourth rotor core is arranged and fixed in sequence at an angle of 1/4 of the pitch of the teeth in one direction, the structure can be made thinner and the equipment can be made smaller. It is advantageous for

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG.
), (b) are schematic plan views and side sectional views thereof, FIG. 3 is an expanded model diagram for explaining the operation of the embodiments shown in FIGS. 1 and 2, and FIGS. 4(a) and (b) are conventional FIG. 5 is an exploded model diagram for explaining the operation of FIG. 4. In the figure, 1 is a permanent magnet, 2-1.2-2.2-3.2-4
is the rotor core, 3 and 8 are the teeth, 4 is the rotating shaft, 5 is the rotor,
6 is a stator core, 7-1.7-2.7-3, 7-4 is a magnetic pole, 9 is a coil, 10 is a stator, ]] is a bearing. Figure 1 Figure 2 (a) (b
) Figure 3 (a) (b) Δ

Claims (1)

[Claims] Four cylindrical rotor cores made of soft magnetic material are arranged in the axial direction in the order of first, second, third, and fourth, and a permanent magnet is arranged between the second rotor core and the third rotor core. At the same time, a rotor having teeth formed at equal pitches on the circumferential surface of each of the rotor iron cores, and a rotor with this rotor placed therein, facing this rotor on each of the left and right sides, and having coils applied thereto, respectively. and a stator having two magnetic poles, and the four left and right magnetic poles of the stator are arranged in the order of first, second, third, and fourth in the longitudinal direction of the rotor in a plane that includes the rotational axis of the rotor. The magnetic poles are fixed, and the magnetic poles are magnetically coupled, and teeth having the same pitch as the teeth provided on the rotor are formed on each of the first, second, third, and fourth magnetic poles, and the teeth of the stator are fixed. Either the teeth of the magnetic poles or the teeth of the first, second, third, and fourth rotor cores of the rotor are arranged and fixed in sequence with an angle shifted by 1/4 of the pitch of the teeth in one direction. A pulse motor characterized by: