JPS62141955A - 2-phase step motor - Google Patents

Abstract

PURPOSE:To readily regulate a gap length and to enhance the torque of a 2-phase step motor by bonding a cylindrical magnet to the peripheral surface of a disclike bush engaged with a rotor shaft, and arranging an annular stator to hold both the edges of the magnet from inner and outer surfaces. CONSTITUTION:Rotor shafts 3 are supported by bearings 2a, 2b to the centers of upper and lower casings 1a, 1b, and the inner peripheral center of a cylindrical magnet 5 is bonded fixedly to the peripheral surface of a cylindrical bush 4 engaged with the shaft 3. C-shaped sectional annular stators 6a, 6b made of an inside ring A and an outside ring B are bonded fixedly to the inner bottoms of the casings 1a, 1b, and an annular coil 7 is held between both the rings A and B. The end poles of the stators 6a, 6b and the pole face of the magnet 5 are opposed each other through a gap G.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of a two-phase step motor equipped with a rotor disk.

BACKGROUND ART 1 In general, two-phase step motors include a system in which a cylindrical magnet 11 is used as a rotor, as shown in FIG. 6, and a system in which a disc-shaped magnet 12 is used as a rotor, as shown in FIG. In both figures, 13a and 13b are stators, 14 is a coil, and 15 is a stator.
is the casing.

Comparing both methods, the method shown in tiS6 has a bulky rotor, which increases the weight and has a large moment of inertia, which hinders the speeding up of the motor.Also, the rotor radius is small and the magnetic pole width is small. When trying to narrow the step width, as shown in Figure 8, adjacent magnetic pole teeth 1
6 becomes large, and it is necessary to take measures to prevent magnetic leakage by shortening the length of the magnetic pole teeth 16 as shown in FIG. The disadvantage is that the loss is large.

In addition, the system shown in FIG.
Since an air gap between the magnetic poles 3b and 3b is formed in the axial direction, the vibration of the rotor 12 in the thrust direction may cause the F gear knob to fluctuate, and the rotor 12 and stator 13a may
, 13b come into contact with each other, and it is troublesome to adjust the air gap during assembly.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its purpose is to eliminate the drawbacks of both of the above-mentioned methods, to reduce the moment of inertia of the rotor, and to reduce the air gap of the rotor. An object of the present invention is to provide a structure of a two-phase step motor that is not affected by vibration in the axial direction.

[Disclosure of the Invention 1 The two-phase step motor according to the present invention is constructed by adhesively fixing the inner surface center portion of a multi-pole magnetized cylindrical magnet to the circumferential surface of a disc-shaped bush fitted to the rotor shaft. It is equipped with a rotor and two annular stators each having a C-shaped cross section, which are arranged so as to sandwich both ends of the cylindrical magnet from the inner and outer surfaces via an air gap. It is characterized by the fact that it is easy to bend, but difficult to bend in the radial direction, and the air gap of the disc-shaped rotor is oriented in the radial direction.

[Embodiment 1] Fig. 1 shows an embodiment of the present invention, in which a bearing 2a is provided at the center of the upper and lower casings 1a and 1b.

The rotor sleeve 3 is supported by the rotor sleeve 2b, and the center portion of the inner surface of the cylindrical magnet 5 is adhesively fixed to the circumferential surface of the disc-shaped punch i4 fitted to the rotor pongee 3. Annular stators 6a, 6b having a C-shaped cross section and consisting of an inner ring A and an outer ring B are adhesively fixed to the inner bottom surface of each casing la, lb, and an annular coil magnet is held in the opening of both rings A and B. There is. The cylindrical magnet 5 is multi-pole magnetized as shown in FIG. 2, and the annular stators 6a and 6b have magnetic pole teeth C having the same number of poles as the cylindrical magnet 5
are provided in a protruding manner, and the tip magnetic pole surfaces of the annular stators 6a and 6b and the magnetic pole surface of the cylindrical magnet 5 face each other with a gap G interposed therebetween. When assembling, as shown in Figure tIS3, the parts are assembled sequentially starting from the bottom part.

6b are assembled by shifting the phases of the magnetic pole teeth C by π/2 (electrical angle).

Since Figure PIS 4 shows another embodiment, it is troublesome to adjust the phase difference between both stators 6a and 6b during assembly, so in order to fix the vertical positional relationship as shown in Figure 5. In addition to integrating the outer rings A of both stators 6a and 5b, the left and right semi-cylindrical bodies A, , A,
is divided by R.

With this configuration, the amphibious cylindrical body A 1 g
Although it is necessary to insert Δ2 from the side, the adjustment of the phase difference remains unchanged, which greatly simplifies the process. The 8-wire process for the coil 7 also simplifies the process by insulating the inner ring B with θ (fatty footing) and then winding the coil directly around the inner ring B, omitting the coil frame. The winding efficiency is increased and torque is increased.

[Effects of the invention 1 As described above, according to the present invention, the rotor shaft is fitted onto the rotor shaft.

A cylindrical magnet is adhesively fixed to the circumferential surface of a disc-shaped bushing, and an annular stator is arranged so as to sandwich both edges of the cylindrical magnet from the inner and outer surfaces. The air gap does not fluctuate, making it easy to adjust the air gap.''Secondly, it improves the sludge resistance, and by reducing the air gap, it is possible to achieve high torque. be.

[Brief explanation of drawings]

! @ Figure 1 is a broken sectional view showing one embodiment of the present invention, Figure 2 is a perspective view of the main parts of the same, Figure 3 is an exploded sectional view of the same, and Figure 4 is an exploded sectional view of the same.
The figure is a perspective view showing a partial cross section of another embodiment same as the above.
The figure is an exploded perspective view of the main parts same as above, Figure 6 is an exploded perspective view of the conventional example, Figure 7 is an exploded perspective view of another conventional example, and Figure 8 is #S6
FIG. 9 is a perspective view of the main part of the conventional example, and FIG. 9 is a perspective view of the main part showing an improved example thereof. la, lb are casings, 2a, 2b are bearings, 3
is a rotor pongee, 4 is a bush, 5 is a cylindrical magnet, and 6a. 6b is an upper and lower annular stator, 7 is a ring-shaped coil, Δ is an outer ring, B is an inner ring, C is a magnetic pole tooth, and G is an air gap. Agent Patent Attorney Ishi 1) Kay 7 Figure 1 Figure 2 Figure 4 Figure 5 Figure 8 Figure 9! ”1 Procedural amendment (voluntary) 1985 37+ 220

Claims (1)

[Claims] (1) A rotor is formed by adhesively fixing the center part of the inner surface of a multi-pole magnetized cylindrical magnet to the circumferential surface of a disc-shaped bush fitted to the rotor shaft, and an air gap is formed between both ends of the cylindrical magnet. and two annular stators each having a U-shaped cross section and arranged to sandwich the stator from the inner and outer surfaces via the annular stator.
Phase step motor.