JPH0448122Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to wiring processing for a sealed motor that is extremely resistant to dust and moisture.

For motors using bearings that are extremely sensitive to dust and moisture, such as hydrodynamic bearings, rotating polygon mirror motors used in laser beam printers, and disk motors, the rotating objects are susceptible to dust, etc. 2. Description of the Related Art In order to block out dust and moisture, or to seal in a gas different from the outside air, motors with a sealed structure including a rotary drive unit and a driven member are required for various devices.

For example, in a motor that uses a so-called hydrodynamic bearing, which supports a rotating member by generating pressure in the fluid interposed in an extremely narrow gap (2 to 10μ) between opposing surfaces that move relative to each other, the opposing surfaces Intrusion of dust and moisture into the gaps between the parts can cause fatal problems such as seizure, and in order to obtain a larger hydrodynamic pressure, it is necessary to fill in a gas with a larger kinematic viscosity coefficient.

In addition, in rotary polygon mirror drive motors used in laser beam printers, magnetic disk drive motors used in computer memory devices, etc., the driven parts, namely the polygon mirrors and magnetic disks, are damaged by moisture and dust. In addition, in the case of a rotating polygon mirror drive motor, the polygon mirror is a polyhedron (4 to 12 faces), and the windage loss associated with rotation becomes large. Encapsulate.

As mentioned above, when sealing the motor part and the motor part including the driven part, the combination of container components can be sealed with O-rings, packings, etc. that can withstand relatively high pressure differences and moisture. There is no good way to handle the power wires and control wires of the motor section.

Conventional methods include molding the wire and sealing material integrally with rubber etc. and pressing them together, and using a sealed connector, but the former method does not allow for sealing between the copper wire and the outer coating. Since there is no seal, it is not possible to obtain a very high sealing performance. In addition, although the latter method has very good sealing performance, the cost of the sealed connector is very high, and the shape of the connector itself is very large, and a large amount of space is required for installing and sealing the connector. This resulted in an unnecessarily large container compared to its size, which hindered miniaturization of the device.

The present invention provides a sealed motor with wiring processing that does not lose its compactness despite having high sealing performance by integrating the wiring part of the sealed motor with the container in a simple manner. The purpose is to

The present invention is a sealed motor in which the assembly of the component parts of a container is sealed, and the motor is configured inside the closed container, and a through hole is provided that communicates with the inside and outside of the container so that the opening directions are aligned. at least two recesses that are separated and integrally formed in the container; a required number of conductive members for power cables that communicate inside and outside the container through a through hole in one of the recesses;
A necessary number of conductive members for control electric wires that communicate inside and outside of the container through the through holes of the other recess, and an insulating plate that electrically insulates and holds the conductive members for power electric wires and control electric wires, respectively. a connector member disposed in each of the recesses, and a resin or the like filled in each of the recesses in which the connector member is disposed, thereby fixing the connector member in each of the recesses and closing the inside of the container. This is a sealed motor that is characterized by being kept in a sealed state.

Embodiments of the present invention will be described below with reference to the drawings. An example of the present invention is shown in FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view, and FIG. 2 is a view taken in the direction of the arrows in FIG.
Although a polygon mirror drive motor using a hydrodynamic bearing is shown here as an example, it will be understood that the present invention is not limited to this.

A fixed shaft 4 having a flange portion 3 fixed to the outer cylinder 1 via an O-ring 2 has a known herringbone groove,
A spiral groove 5 is carved, and a rotating sleeve 6 surrounds it with an air gap of 2 to 10 μm. A thrust bearing 8 having a throttle hole 7 in the center and press-fitted into the inner surface of the rotating sleeve 6, the outer periphery of the fixed shaft 4, and the end of the rotating sleeve 6 constitutes a hydrodynamic bearing using air as a medium.

A polygon 9 is fixed to the upper flange portion of the rotating sleeve 6, a magnet 10 as a rotor of the motor is fixed to the lower part, and a balance ring 11 for balancing the movement.
a stator 12 fixed to the outer cylinder 1 facing the stator 1;
A Hall element 13 that detects changes in the magnetic field and a Hall IC (not shown) that obtains the rotation speed for PLL control from changes in the magnetic field are fixed to the stator 12 via a printed board 14 and a holder 15, and drive a so-called DC Hall motor. It consists of

Furthermore, a glass window 24 through which a laser beam scanned by polygons 9 enters and exits is attached to the outer cylinder 1 as a motor container, and a cap 27 for assembly is attached to the upper part, also with an O-ring. 16 and is fixed to the outer cylinder 1 to ensure sealing.

When a current is applied to the coil of the stator 12, the rotating sleeve 6 begins to rotate in a predetermined direction due to magnetic repulsion and attraction with the magnet 10. As a result, air flows along the groove 5 cut in the fixed shaft 4. Pressure is generated in the radial direction as the air flows in, and pressure is also generated in the thrust direction as the air flow is restricted by the restriction hole 7 of the upper thrust receiver 8.
It continues to rotate without contacting the fixed shaft 4 in both the thrust direction.

Further, recesses 17 and 18 communicating with the inside and outside of the outer cylinder 1 are formed at least on the left and right two places in the inner bottom of the outer cylinder 1 so that the closing directions are aligned, and the recesses 17 and 18 are provided with power wires for the coils of the stator 12, respectively. 5 for use
Connector members 21 and 22 are formed by penetrating through holes in the bottoms of the recesses 17 and 18 at a predetermined pitch on the insulating plate 20 with 11 conductive members for drive input to the Hall element 13, Hall IC, and control wires. are in contact with each other, and the inner side protrudes into the outer cylinder 1 by passing through the bottom openings of the recesses 17 and 18, and the recesses 17 and 18 are sufficiently filled with the filler or adhesive 23, and the connectors 21 and 22 are fixed. has been done. and outer cylinder 1
The stator 1 is attached to the inner connector members 21 and 22 of the
It is connected to the coil of No. 2, the Hall element 13, etc. by soldering, wrapping, etc., and the outside is wired correspondingly to each of them and connected to a predetermined motor driver by connectors 25, 26.

Here, the filler or adhesive 23 must have filling properties, be electrically insulating, have no air permeability, have strong adhesion to the conductive member and the material of the outer cylinder 1, and have a thermal expansion coefficient as low as possible. It is necessary to select a material close to that of , for example, epoxy resin or the like is preferable.

Furthermore, as can be seen from its function, the conductive material used in the connector members 21 and 22 may be made of nickel-plated or gold-plated phosphor bronze, which is used in ordinary connectors, so that its shape, pitch, etc. are compatible with the female connector. If you think about it, you won't have to worry about wiring and it will be convenient to handle as a unit.

If the recesses 17 and 18 of the outer cylinder 1 are also made of aluminum die-casting or plastic, they can be integrally formed, and noise resistance can be improved by separating the power line and the control line as shown in the figure. Furthermore, aligning the directions of the recesses 17 and 18 makes the filling operation easier.

As described above, in a sealed motor having a motor structure inside a closed container, at least two recesses with through holes are provided at separate positions of the container, and a conductive member penetrating from the inside to the outside of the container is made of plastic. Press-fit into an insulating plate such as a board, each electrically insulated container can be directly filled with filler or adhesive, etc.
By adhering, wiring can be done to the outside of the motor part without damaging the sealing property of the container, and since the conductive member for control wires and the conductive member for power wires are separated and face the same direction, Even if there are a large number of wires, it is easy to fill with resin, etc., and can be assembled compactly (for example, the pitch of the connector material can be about 25 mm). There is no need to worry about potential problems, and the wiring process will be easier if the male contact is placed upright in the recess. or,
Since the conductive member for the control wire and the conductive member for the power wire can be separated so as not to electrically interfere, noise resistance is improved. This idea is effective not only for motors for driving rotating polygon mirrors, but also for all motor configurations that require sealing performance.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
The figure is a view from A in FIG. 1. DESCRIPTION OF SYMBOLS 1... Outer tube, 12... Stator, 13... Hall element, 14... Printed board, 15... Holder, 17, 18... Recessed part, 20... Insulating plate, 21, 22... Connector member, 23 ... Filler or adhesive, 25, 26 ... Connector.

Claims (1)

[Scope of utility model registration request] The combination of the component parts of the container is sealed and configured,
In this sealed motor having a motor structure inside a closed container, at least two recesses are integrally formed in the container and are separated from each other so as to align the opening directions, and are provided with a through hole that communicates with the inside and outside of the container. and a necessary number of conductive members for power wires that communicate inside and outside the container through the through holes in one of the recesses, and conductive members for the necessary number of control wires that communicate in and out of the container through the through holes in the other recess. and an insulating plate that electrically insulates and holds the conductive members for the power wire and the control wire, respectively,
A connector member is placed in each of the recesses, and each of the recesses in which the connector member is placed is filled with resin, etc., thereby fixing the connector member to each of the recesses and sealing the inside of the container. A sealed motor characterized by holding.