JPH0217844A - Dc motor provided with slide device - Google Patents

Abstract

PURPOSE:To facilitate the sole drive of a load when it is not energized by coupling a power transmission mechanism to the load to a rotor by the magnetic force of the rotor only during its energization. CONSTITUTION:A permanent magnet 3 is used as a stator, and a winding 4-2 is wound on a polarized core 4-1 as a rotor 4. A cup assembly 7 integrated with a cylindrical section 7-2 and a gear 1 is inserted into a rotor shaft 4-4 for supporting the rotor 4. The section 7-2 of the assembly 7 is formed of a magnetic member, and when the winding 4-2 of the rotor 4 is not energized so as not to be operated as a motor, the assembly 7 is not coupled to the rotor 4. When the winding 4-2 is energized, the assembly 7 is attracted by a leakage magnetic flux from its end face, rotated integrally with the rotor 4 to externally transmit power.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention (Field of Industrial Application) The present invention relates to a structure for imparting slip to a DC motor equipped with a slip device.

(Prior Art) The content and structure of the prior art will be explained with reference to FIGS. 6 and 7.

The figure shows a stator in which a field permanent magnet 3 is fixedly arranged on the inner peripheral surface of a cylindrical case 1 that also serves as a stator yoke, and a polarized iron core 4-1 is wound around the stator on the inner surface. A connection mechanism with a load is disposed at the tip of an output shaft of a DC motor main body having a rotor 4 having a winding 4-2.

The configuration of this example uses a so-called electromagnetic clutch, in which a drive-side connection plate 8 is fixed to the rotor shaft 4-4 of the electric motor, and a driven-side connection plate 9-11 faces the drive-side connection plate 8. The driven side connecting plates 9-11 are connected and separated by being operated in the axial direction by the electromagnetic clutch 9.

FIG. 6 shows that by cutting off the power supply to the winding 9-5 of the electromagnetic clutch 9, the cylindrical portion 9-12 integrated with the driven side connecting plate 9-11 is pushed out by the extension of the pushing spring 9-3. FIG. 7 shows a state in which the driven side connecting plate 9-11 is pressed against the driving side connecting plate 8, and in contrast, when the winding is energized, the spring 9-11 is pressed against the driving side connecting plate 8.
3, the cylindrical portion 9-12.3 is integrally fixed to the movable piece 9-1. Therefore, the driven side connecting plate 9-11 which is integral with this is attracted, and the driven side connecting plate 9-1
1 shows a state in which the pressure contact state with the drive-side connecting plate 8 is released and the drive-side connecting plate 8 is separated.

In this configuration, as described above, the electromagnetic clutch 9 is energized at the same time as the electric motor is energized, so that the torque generated by the electric motor when energized is transmitted between the driving side connecting plate 8 and the driven side connecting plate 9-1.
1. Furthermore, via the gear 9-2 integrated with the driven side connecting plate,
This is transmitted to the engagement gear 11 of the load system that engages with this, and drives the load.

When the electric motor and the electromagnetic clutch 9 are de-energized, the rotation of the electric motor is stopped and at the same time, the attraction force to the movable piece 9-1 of the electromagnetic clutch 9 is released, so that the drive-side connecting plate 8 is removed as described above. The connection between the drive side connecting plate 9-11 is released, the load system and the rotor 4 are separated, and when the load (not shown) is reversely operated from the outside, the field The influence of the restraining force of the rotor 4 due to the permanent magnet 3 is eliminated.

As mentioned above, the configuration of the prior art achieves the intended purpose functionally, but the electromagnetic clutch 9 is separate from the electric motor.
had to be used in combination, and there was room for improvement in terms of ease of handling and cost.

(Problems to be Solved by the Invention) The present invention eliminates the restraining torque caused by the fixed magnetic field of the permanent magnet for the field, and allows the reversal operation from the outside when the field is not energized and not in operation without using a special external device. The object of the present invention is to obtain a DC motor equipped with a sliding device that can be realized.

(2) Structure of the Invention (Means for Solving the Problems) A DC motor equipped with a sliding device according to the present invention has a cylindrical shape integrally formed with a disk-shaped portion and its outer periphery using a magnetic material member. A cup structure consisting of a cup structure, a gear formed coaxially on the disc-shaped part, a small hole provided in the center thereof, and a rotor shaft inserted through the small hole as a bearing so that it can be freely rotated. is attached to the rotor, and the open end surface of the cylindrical portion is brought into contact with the outer periphery of the end surface of the rotor core, and the cup component is formed integrally with the gear by a sintering mold, or is made of a magnetic thin plate. It is formed by drawing, and is structured so that the gear is fixed as a separate piece.

(Function) In the above-mentioned configuration, the restraining torque due to the fixed magnetic field of the permanent magnet for the field is eliminated, and reversal operation from the outside during non-energized non-operation is realized without using any special external device. It brings about the effects that can be achieved.

(Example) The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view of an example of a DC motor equipped with a sliding device according to the present invention, and shows the interior formed by a box 1 constituting an outer cover and a cover 2 fitted on the front and back of the box 1. In addition to the stator and rotor that make up the electric motor, a structure that provides a sliding function is also installed inside the space.

A field magnetic flux is obtained using the permanent magnet 3 as a stator, and a polarized iron core 4-
The structure of the electric motor main body, in which the winding 4-2 is wound around the coil 4-2 to form a rotor, is the same as that of the prior art described above.

The present invention provides a fourth rotor shaft 4-4 that pivotally supports the rotor 4.
A cup assembly 7 including a cylindrical portion 7-22 and a gear 7-1 as shown in FIG. FIGS. 2 and 3 show the cup assembly 7 shown in FIG. The state of the gear 7-1 and the cup structure 7-2 as a single unit is shown.

As mentioned above, FIG. 5 shows the gear 7-1 and the cup structure 7-2.
An example is shown in which these are integrally formed, for example, by sintering.

The cylindrical portion 7-22 of the cup structure 7-2 is formed of a magnetic material member, and when the winding 4-2 of the first rotor 4 is not energized and is not operating as an electric motor, the cylindrical portion 7-22 is The open end surface 7-23 of -22 is only facing the rotor core 4-1 in its natural state, and both are in a state where they can rotate freely relative to each other. When the winding 4-2 is energized through the child 4-3 and the motor is put into operation, the cup structure 7-2 is attracted by leakage magnetic flux from the end face of the rotor core 4-1, and the attraction Due to the force, the cup structure 7-2
-1, and rotates integrally with the rotor 4.

The torque generated in the rotor 4 is transmitted to the load side as follows.
This is only when the motor is in an operating state where the winding fi4-2 of the rotor is energized, and when it is not energized, the rotor 4 and gear 7-1 are in a separated state.

When an operation is performed to force rotation from the load side, the first rotor 4 is freed from the influence of the attraction and fixation force of the field permanent magnet 3, and rotation is possible with a small external force.

The cup assembly 7 including the gear 7-1 is rotatably supported by the rotor shaft 4-4 through a small hole in the center of the cup assembly 7: a shaft penetration hole 7-3.

As described above, in this configuration, the transmitted torque is based on electromagnetic coupling force, so it is stable without any change over time, and therefore, its reliability is high.

In this specification, an example of a configuration in which the face piece and the lid form the outer cover of the electric motor has been shown, but it goes without saying that the present invention can also be applied to a so-called build-in type in which the outer cover is separately configured.

In this example, the engagement gear 11 for the load system that engages with the gear 7-1 on the torque transmission side passes through the window 1-1 formed in the case 1 and connects the load arranged outside the electric motor. is combined with

(3) Effects of the Invention The DC motor equipped with the sliding device of the present invention eliminates the restraint torque caused by the fixed magnetic field of the permanent magnet for the field, and allows reverse operation from the outside when the current is not applied and the motor is not in operation. It has the advantage that it can be realized with high reliability without using together.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an example of the present invention, and Fig. 2 is a front view (a) and a sectional view (a) of a gear, which is a component that provides a sliding function.
b), FIG. 3 is a sectional view (a) and a front view (b) of a cup structure integrally coupled with the gear, and FIG. 4 is a cup assembly in which the gear and the cup structure are combined; FIG. 5 is a cross-sectional view of an example in which the gear and the cup structure are integrally formed, and FIGS. 6 and 7 are cross-sectional views of an example of a conventional electric motor. FIG. 7 shows the state in which the clutch is connected, and the electric motor is stopped due to input cutoff, and the electromagnetic clutch is separated. Explanation of symbols 1...Box, 1-1...Window, 2...Lid,
3...Permanent magnet, 4...Rotor, 4-1...
・Polarized iron core, 4-2... Winding, 4-3... Commutator, 4-4... Rotor shaft, 5... Brush, 6...
...Bearing, 7...Cup assembly, 7-1...
Gear, 7-2... Cup component, 7-21...
Disc-shaped part, 7-22...Cylindrical part, 7-23...
...Opening end surface, 7-3...Shaft penetration hole, 8...
Drive side connecting plate, 9... Electromagnetic clutch, 9-1...
・Movable piece, 9-11... Driven side connection plate, 9-12.
...Cylindrical part, 9-2...Gear, 9-3...
・Extrusion spring, 9-4... Fixed side yoke, 9-5.
...Electromagnetic clutch winding, 10...pressing spring. 11... Engagement gear to load system, 12... Support shaft,
13... External fixing member. Patent applicant Nippon Servo Co., Ltd. Figure 2 Figure 4 Figure 3 Figure 5

Claims (3)

[Claims] (1) A stator is a box made of a magnetic member and a permanent magnet fixed to the stator, and a winding is wound around a polarized iron core, so that the stator is rotatable through a small gap between the inner peripheral surface of the permanent magnet and the permanent magnet. In a DC electric motor having a rotor supported by a shaft and a sliding device between the rotor and an external load connected to the rotor, a magnetic member is integrally attached to the disk-shaped portion and its outer periphery. A cup structure consisting of a cylindrical part formed in a circular shape, a gear coaxially fixed to the disc-shaped part, and a small hole provided in the center thereof, and the small hole used as a bearing to connect to the rotor shaft. A direct current motor equipped with a sliding device, characterized in that the sliding device is mounted on a rotor so as to be rotatable by being inserted through the rotor, and the open end surface of the cylindrical portion is brought into contact with the vicinity of the outer periphery of the end surface of the rotor core. (2) A DC motor equipped with a sliding device according to claim 1, wherein the cup structure is integrally formed with a gear by a sintering mold. (3) A DC motor equipped with a sliding device according to claim 1, wherein the cup structure is formed by drawing a magnetic thin plate, and has a gear fixed to it as a separate member.