JPS61150662A - Transmission mechanism of motor power - Google Patents

Abstract

PURPOSE:To readily control the transmission of a torque with a simple structure by rotatably inserting a power supply plate formed of a conductive material to a rotational shaft oppositely to a magnet secured to the outer periphery of the rotational shaft of a motor. CONSTITUTION:A plurality of magnets 3 are secured to the outer periphery of an iron plate 5 secured to a rotational shaft 2 of a motor 1 to rotate together with the shaft 2. A power supply plate 4 formed of a conductive material such as aluminum or copper is rotatably inserted to the shaft 2, and opposed to the magnet 3. A pinion gear 6 is integrally secured to the plate 4, and power is externally transmitted through gear trains 8, 8a. When the motor 1 is rotated, the plate 4 is rotated by the magnetic flux generated by the eddy current generated on the plate 4 and the magnetic flux of the magnet 3. Thus, the plate 4 is slipped at overload time, and when the motor 1 is stopped, the plate 4 becomes free, and can be simply returned to the original position.

Description

[Detailed description of the invention] 【Technical field】

The present invention relates to a technique for transmitting the rotational force of a motor as power to a movable part.

[Background technology]

Conventionally, the power of the motor was transmitted to a pinion gear fixed to the rotating shaft of the motor via a gear train, etc., but after rotating the motor and operating the movable part, the movable part was In order to return to this state, the only option was to reverse the motor, and in order to allow the motor to idle when a large load was applied to the moving parts, a device such as a slipping clutch was required in the middle.

[Purpose of the invention]

The present invention was made in view of the above-mentioned technical background, and its purpose is to easily return the movable part by turning the power supply plate into a 7-lead state when the motor stops.
Moreover, the object is to realize a mechanism in which the motor idles when a load above a certain level is applied to the movable part with a simple structure.

[Disclosure of the invention]

In the motor power transmission mechanism of the present invention, a magnet 3 is fixed to the outer periphery of a rotating shaft 2 of a motor 1, and a power supply plate 4 made of a conductive material is rotatably inserted into the outer periphery of the rotating shaft 2. The power supply plate 4 is arranged to face the magnet 3. When the magnet 3 rotates with the rotation of the motor 1, the gap between the magnet 3 and the power supply plate 4 is caused by a change in magnetic flux density. An electromagnetic coupling force (magnetic interaction) is generated, and the power supply plate 4 is rotated by this electromagnetic coupling force, and the power of the motor 1 is transmitted.The rotational force of the power supply plate 4 is This is due to the electromagnetic coupling force between the magnet 3 and the power supply plate 4, so if a large load is applied to the power supply plate 4 side, slippage will occur between the two, causing the motor 1 to idle. Moreover, when the motor 1 stops rotating, the electromagnetic coupling force disappears, so the power supply plate 4 becomes 717-, and the power supply plate 4@ can be easily returned to its original state. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The motor 1 is, for example, a capacitor induction motor, and a steel plate 5 is fixed to a rotating shaft 2 of the motor 1, and a magnet 3 is fixed to the circumference of the iron plate 5 and fixed to the rotating shaft 2. . The polarity of this magnet 3 is not axially symmetrical about the rotating shaft 2, but is, for example, a north pole at one point on the iron plate 5 and an south pole at the opposite side of the circumference. In addition, a disk-shaped power supply plate 4 made of a conductive material such as aluminum or copper is rotatably inserted into the rotating cypress 2 and is opposed to the magnet 3. A bearing 7 is interposed between the inner periphery of the power supply plate 4 and the pinion gear 6 and the rotating shaft 2, so that the power supply plate 4 and the pinion gear 6 rotate smoothly. Also, a slight gap d is provided between the magnet 3 and the power supply plate 4 to prevent frictional force from occurring between the two, but the size of this gap d varies depending on the required rotational torque. be. A gear train 8 is meshed with the pinion gear 6, a return spring 9 is connected to the last gear 8a, and the base end of an operating lever 10 is fixed. When the motor 1 is powered on and the rotating shaft 2 is rotated, the magnetic flux coming out of the magnet 3 and reaching the power supply plate 4 moves on the power supply plate 4, so that the power supply plate 4 is locally
The magnetic flux density changes, and eddy currents are generated on the surface of the power supply plate 4. Due to this eddy current, the power supply plate 4 is magnetized and generates magnetic flux. Then, the magnet 3 and the power supply plate 4
The two are electromagnetically coupled by the interaction of their magnetic fields, and as the magnet 3 rotates, the power supply plate 4 is also rotated. When the power supply plate 4 rotates, the gear train 8 also moves, and the last gear 8a moves the operating lever 10 to appropriately move the movable part (not shown). Note that the movable part may be a shutter that can be opened and closed. Since the operating range of this movable part is limited, if the motor 1 moves more than one room and its movement is restricted by the stopper, the load from the stopper will overcome the electromagnetic coupling force and the motor 1 will idle. At this time, since the magnet 3 and the power supply plate 4 idle, the motor 1, the gear train 8, etc. are not damaged. Also, when the motor 1 is stopped, the power supply plate 4
The eddy current disappears and the electromagnetic coupling force disappears between the magnet 3 and the power supply plate 4, so the power supply plate 4 becomes free and the last gear 8a is returned to its original state by the return spring 9. , the operating lever 10 is also moved back to its original position. At the time of this return, the power supply plate 4 rotates relative to the stationary magnet 3, so an electromagnetic coupling force is also generated, and this electromagnetic coupling force acts as a brake and buffers the movable part. It is something that

【Effect of the invention】

As described above, the present invention (a magnet is fixed to the outer periphery of a rotating shaft of a motor, a power supply plate formed of a conductive material is rotatably inserted on the outer periphery of the rotating shaft, and the power supply plate is connected to the magnet). When the magnet rotates as the motor rotates, an electromagnetic coupling force (magnetic interaction) is generated between the magnet and the power supply plate due to a change in magnetic flux density, and this electromagnetic coupling force The power supply plate is rotated with the rotation of the motor and the power of the motor is transmitted, and the rotational force of the power supply plate is due to the electromagnetic coupling force between the magnet and the power supply plate. When a large load is applied to the power supply plate side, slipping occurs between the two, causing the motor to idle.Moreover, when the motor stops rotating, the electromagnetic coupling force has disappeared, so the power supply plate 7 Lee, the power supply plate side can be easily returned to its original state, and it has the advantage of having an extremely simple structure.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a side view of the same magnet and power supply plate, where 1 is a motor, 2 is a rotating shaft, 3 is a magnet, and 4 is a power supply plate. This is the supply board. Agent Patent Attorney Ishi 1) Ai 7 Figure 1 Figure 2 Ki

Claims (1)

[Claims] (1) A magnet is fixed to the outer periphery of the rotating shaft of the motor, and a power supply plate made of a conductive material is rotatably inserted on the outer periphery of the rotating shaft, so that the power supply plate faces the magnet. A motor power transmission mechanism characterized by: