JPS6013380B2 - synchronous motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synchronous motor, and particularly to a small-sized synchronous motor.

More specifically, the present invention relates to a so-called inductor-type small synchronous motor that uses a single-phase coil as an excitation coil.

An object of the present invention is to simplify and improve the performance of the gear train in the high-speed rotation and low-torque portion, so-called first stage portion, of the reduction gear wheel in the synchronous motor.

This type of synchronous motor is used in various drive sources, such as timer motors for fully automatic washing machines, and drive sources for 4-type electrical equipment, such as tape recorders and computer operators.

This type of inductor type electric motor is desired to have high performance, high reliability, small size, light weight, high productivity, and low cost.

In particular, by simplifying the gear train in the first stage of the reduction gear wheel, it is possible to eliminate stuck failures, which account for most of the failures of this electric motor, and improve reliability.

In addition, reducing the number of parts and obtaining an inexpensive drive source increases the reliability of the equipment, and at the same time makes it possible to use it in a wide range of applications from low-priced products to high-priced products. This is a factor that increases value. Furthermore, eliminating stuck defects eliminates the production costs required for defects, improves productivity, reduces the cost of the motor, and further increases the value of the product.

The present invention has been made with the above-mentioned in mind, and aims to simplify the reduction gear and make it 4-shaped with an improved configuration, pursue high reliability, and obtain an inexpensive inductor-type synchronous motor with no stopping defects.

That is, the structure is such that a powder solidified magnetic material such as a ferrite magnet is used for the rotor, and the outer peripheral surface of the rotor is coated with N.
The S magnetic poles are alternately magnetized at equal intervals, and a pinion for extracting rotational driving force and a reverse rotation prevention cam are integrated with the rotor.

At the same time, field magnets and poles are arranged on the outside of the rotor so as to face the magnetic poles of the rotor and to be alternately excited to different polarities. Further, several rows of reduction gears for output extraction are arranged so as to mesh with the pinion.

Furthermore, a reversal prevention stopper is arranged to be engaged with the reversal prevention cam. Next, in the above configuration, the output pinion provided on the rotor, which is the first stage part of the reduction gear,
This is a synchronous motor with a configuration in which the output pinion and the center wheel of the second wheel and third wheel are provided on the same axis, and the second wheel is a separate shaft.

As for the slave, the output pinion, first wheel, second wheel, etc. can be provided on separate shafts, or another method is to use a common magnetization system after the second wheel.

The present invention has been made in view of the above points, and provides a highly reliable and simplified synchronous motor that has always been of high industrial value.

An embodiment of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a magnetic pole yoke having a flat bottom 2 and forming a U-shaped cross section with upright, substantially similar and parallel side plates 3 and 4 facing each other, and a magnetic pole 5' in the center of the magnetic pole yoke 1.
, 5''... are integrally formed, and the shaft 6 stands as a shield in the center.

An excitation coil 7 is wound around the outer periphery of the magnetic poles 5', 5'', and a bobbin 8 is fixed. This excitation coil 7 is normally a single-phase winding coil. 9 is a thrust washer. .

Reference numeral 10 denotes a rotor made of a cylindrical powder solidified magnetic material, such as barium ferrite material, and N and S magnetic poles are arranged alternately at equal intervals on the outer periphery of the rotor. , is rotatably supported.

Further, a cam 11 for preventing reverse rotation and an output pinion 12 are integrally formed in the center of the rotor 10. 13 is a U-shaped center magnetic pole plate, and a magnetic pole 15' is located in the center of the bottom 14.
, 15... are integrally formed, and a shaft 1 is provided in the middle part.
6, 17, and 18, respectively, and the outer periphery engages with the protrusions 19', 19''... and stepped portions 20', 20''... provided on the side plates 3, 4 of the magnetic pole yoke 1. Caulking stepped portion 21
', 21... are crimped and fixed to the magnetic pole yoke.

22 is a stopper for preventing reverse rotation of the rotor 10, and the shaft 16
The protrusion 23 engages with the cam 11.

A number wheel 24 is rotatably supported on the shaft 16, and a gear 25 meshes with the output pinion 12.

The outer periphery of the end on the pinion 26 side, which is integrally formed with the gear 25, has the tooth root diameter D, ? A cylinder 27 with a diameter D20 is integrally provided. Reference numeral 28 denotes a compression spring which presses against the reversal prevention stopper 22 through the first wheel 24 to generate a slight frictional force, so that the reversal prevention stopper 22 rotates following the rotation of the first wheel 24. ing.

That is, it is a well-known fact that the direction of rotation of the rotor 10 of this type of synchronous motor is determined by the waveform of the current applied at the time of starting.Therefore, when the power is turned on, the rotor 10 moves in the P direction. When the desired rotation is reached, the first wheel 24
rotates in the Q direction, and the anti-reverse stopper 2 follows.
2 rotates in the R direction, disengaging from the cam 11, and rotor 1
0 continues normal rotation and transmits the rotation to the reduction gear group.
In this case, the anti-reverse stopper 22 is rotated at a certain angle (force 11
After rotation, the protrusion 23 touches the center magnetic pole 13 and remains stationary until it is disengaged. Next, when the rotor 10 reverses, the number wheel 24 also reverses and follows, and the anti-reverse stopper 22 also rotates, so its protrusion 23 engages with the cam 11 to prevent the rotor 10 from rotating in the opposite direction. Return to normal rotation.

29 is the second wheel and pinion 6, 30 is the third wheel and pinion 17, 31
is a fourth wheel and is rotatably supported on the shaft 18.

Reference numeral 32 designates a planar bearing plate, in the center of which a bearing hole 34 of the shaft portion 33 provided in the fourth wheel & pinion 31, bearing holes 34, 36, 37 for the shafts 6, 16, 17, and a shaft 39 of the gear 38 are formed. Each has been outsert (Mauldin).

The shaft 35 has a boss 4 attached to it.
1 and is engaged and supported. Further, the outer peripheral portion engages with the side plates 3 and 4 of the magnetic pole yoke 1 and is fixed by crimping. In the above configuration, when the excitation coil 7 is excited by an external power source, the magnetic poles 5', 5''... and the magnetic poles 15', 15''...
The N and S poles are magnetized, respectively, and give a rotational force to the rotor.

At this time, if the rotation direction is not normal, the rotation of the rotor 10 is prevented by engaging the reverse rotation prevention stopper 22 and the cam 11 as described above. Next, when the exciting coil 7 is excited in the next half cycle, the magnetization of the N and S poles of each magnetic pole is reversed, and the rotor 1
0 is normal rotation. At this time, as described above, the anti-reverse stopper 22 and the cam 11 are disengaged, and the rotor 10' continues to rotate in the normal direction, with the first wheel 24, second wheel 29, third wheel 30, and fourth wheel 31. It rotates at a reduced speed, transmits rotational force to the gear 38, and drives and rotates the reciprocating equipment. Since the present invention operates with the above configuration, the output pinion, first wheel, and second wheel are supported by two shafts, so the specifications of each pinion and each gear can be made the same. It is easy to manufacture molds and control dimensions, the rotation direction of the rotor and the two-wheeled wheel is the same, there is no loss of the thrust surface, and it is only necessary to stand the two shafts in a shield, so there is little manufacturing variation, and it is suitable for the first stage. This is a useful invention, as there is no meshing failure between the gears of the motor, and the failure to stop, which is a fatal failure of this type of synchronous motor, is avoided.

The effect is particularly great because the torque in the first stage is low, on the order of several tens of degrees.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a top view, FIG. 2 is a longitudinal sectional view with a part cut away, FIG. 3 is a plan view of the main part, and FIG. 4 is an overall view. FIG. 1... Magnetic pole moke, 6... Shaft, 12... Output pinion, 24... First wheel, 29... Second wheel. Hair Figure 2 - Hair Figure 4 - Hair Figure 4

Claims (1)

[Claims] 1 A plurality of magnetic poles are integrally formed at the bottom of a U-shaped magnetic pole yoke and arranged in a substantially cylindrical shape, and a plurality of magnetic poles are integrally formed at the bottom of a U-shaped center magnetic pole plate and approximately cylindrical. The bobbin is arranged in a cylindrical shape, and the center magnetic pole plate is attached to the magnetic pole yoke so that the magnetic poles of the magnetic pole yoke and the magnetic poles of the center magnetic pole plate match, and the excitation coil is wound around the outside of the magnetic poles arranged in the cylindrical shape. N. A shaft is provided to rotatably support a rotor with S magnetic poles, a reduction gear group is provided to extract the rotational force of this rotor to the outside, and a cam for preventing reverse rotation is formed on the upper surface of the center of the rotor. An output pinion is formed on the upper side of the cam, and the first wheel constituting the reduction gear group is rotatably supported with a shaft at a position eccentric from the rotation center of the rotor, and the outer peripheral teeth of this first wheel are connected to the rotor. An anti-reverse stopper that meshes with the output pinion of the first wheel and is rotatably supported by the shaft supporting the first wheel is placed on the underside of the first wheel, and the anti-reverse stopper rotates as the first wheel rotates. In order to do this, a slight frictional force is applied to the joint surface between the number one wheel and the stopper to prevent reverse rotation, and when the rotor rotates on one side, the cam for preventing reverse rotation provided on the rotor side follows the number one wheel. The anti-reverse stopper rotates when the rotor rotates, and the anti-reverse stopper is configured to engage with the anti-reverse cam that restricts the rotation of the rotor during the other rotation of the rotor. The anti-reverse stopper is configured to be disengaged from the anti-reverse stopper, and the anti-reverse stopper is configured such that when the rotor rotates in a direction in which rotation is not restricted, the anti-reverse stopper comes into contact with the center magnetic pole plate when the anti-reverse stopper rotates by a certain angle, A synchronous motor characterized in that a second wheel of a group of reduction gears meshing with a pinion provided on the first wheel is rotatably supported on the shaft that rotationally supports a rotor.