JP5181643B2 - motor - Google Patents

Description

  The present invention relates to a motor mainly used for AV equipment.

  Disk drive devices used in AV equipment are required to be small, thin, low in noise, and low in cost, and motors incorporated therein are also required to be small, thin, low in noise, and low in cost. When the height of the motor is changed to reduce the thickness of the motor, the shape and dimensions of the parts have been changed (see, for example, Patent Document 1).

  FIG. 3 shows the structure of a conventional motor described in Patent Document 1. 3, 41 is a shaft, 42 is a rotor frame, 43 is a rotor magnet, 44 is a retaining member, 45 is a thrust plate, 46 is a bearing, 47 is a bearing housing, 48 is a motor mounting plate, 50 is a core, and 51 is a thrust. The cover 52 is a winding.

Conventionally, when the magnetic center of the core and the magnet are displaced, the thrust force is increased or decreased by changing the rotational position of the rotor. It is known that the change in the thrust force appears as motor vibration in the thrust direction or causes noise of the motor (see, for example, Patent Document 2). For this reason, the magnetic center of the core 50 and the magnet 43 is substantially matched to achieve low noise. In addition, the axial relative positions of the retaining member 44 formed in the rotor and the flange 53 provided in the bearing housing 47 are appropriately arranged so that the rotor part can be removed even if vibration or impact is applied to the motor or the disk drive device. It is set not to be.
JP 2003-32932 A (3rd page, 4th page, FIG. 1) JP-A-1-47253 (page 2)

  However, in the above-described conventional configuration, when changing the motor height dimension H defined by the dimension from the motor mounting portion of the motor mounting plate to the top surface of the rotor frame, the core and the magnetic center of the magnet are substantially matched, As one method for preventing the relative position in the axial direction of the flange provided on the configured retaining member and the bearing housing from changing, it is necessary to simultaneously change the shape of the bearing housing and the shape of the thrust cover. As a result, there was a problem in achieving cost reduction.

  SUMMARY OF THE INVENTION The present invention solves such a conventional problem, and a motor height dimension setting method that can set motor height dimensions by sharing motor parts, maintaining low cost, and causing no characteristic change. The purpose is to provide.

  In order to solve the above problems, the present invention provides a height adjustment step on a motor mounting portion of the motor mounting plate and a portion for fixing the bearing housing and the core holder, and the motor mounting portion and the axial top surface of the rotor frame are provided. This is a motor height dimension setting method in which the motor height dimension defined by the dimension between them is set to a required value by adjusting the dimension of the step.

The invention according to claim 1 of the present invention can change the motor height only by changing the step provided on the motor mounting plate when changing the height of the motor.
There is an effect that it is possible to provide a motor that maintains a low price and does not change its characteristics.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
In FIG. 1, the motor is composed of a rotor part and a stator part. The rotor portion includes a rotor frame 2 that fixes the shaft 1 at the center thereof, a rotor magnet 3 attached to the rotor frame 2, and a retaining member 4 cut out from the rotor frame 2.

  The stator portion includes a bearing 6 that rotatably supports the shaft 1, a bearing housing 7 that holds the bearing 6, a thrust plate 5 that supports the shaft 1 in the axial direction and constitutes a thrust receiving portion, and a rotor magnet. 3, a core 10 disposed opposite to 3 and provided with a winding 12, a core holder 9 that holds the core 10, and a motor mounting plate 8 that holds the core holder 9, and the bearing housing 7 has an outer diameter. A flange 13 is provided on the side, and the flange 13 is engaged with the retaining member 4 so that the rotor portion does not come out of the stator portion. The bearing housing 7 is fixed to the upper surface of the motor mounting plate 8 while accommodating the thrust plate 5 at the lower end. The upper surface of the motor mounting plate 8 in the axial direction is a motor mounting portion. And it has the structure which has the level | step difference H1 for motor height adjustment between the motor attachment part of the motor attachment board 8, and the part which fixes the core holder 9. FIG.

  According to such a configuration, when changing the height dimension H of the motor, the motor height dimension H can be changed only by changing the step H1 provided on the motor mounting plate 8, so that the motor parts can be shared and the cost can be reduced. It is possible to provide a motor that maintains and does not change characteristics.

(Embodiment 2)
FIG. 2 shows another embodiment of the present invention. Constituent elements having the same functions as those of the first embodiment shown in FIG. The main difference from the first embodiment is that the bearing housing 7 and the core holder 9 that holds the core 10 are integrally formed, and the bearing housing 7 holds the core 10. In addition, a retaining member 4 formed separately from the rotor frame 2 is attached to the rotor frame 2, and a thrust cover 11 that accommodates and holds the thrust plate 5 is fixed to the lower end portion of the bearing housing 7 to be thrust. The point from which the receiving part is comprised differs from the said Embodiment 1. FIG. And it has the structure which has the level | step difference H2 for motor height adjustment between the motor attachment part of the motor attachment board 8, and the part which fixes the bearing housing 7. FIG.

  According to such a configuration, when changing the height dimension H of the motor, the motor height dimension H can be changed only by changing the step H2 provided on the motor mounting plate 8, and the motor parts can be shared and the cost can be reduced. It is possible to provide a motor that maintains and does not change characteristics.

  The motor according to the present invention has an effect that the height of the motor can be changed without changing the parts, processes, and characteristics of the motor by providing a height adjustment step on the motor mounting plate. This is useful as a method for setting the height dimension of the motor used.

Sectional drawing which shows the motor by Embodiment 1 of this invention Sectional drawing which shows the motor by Embodiment 2 of this invention Cross section of conventional motor

Explanation of symbols

1, 41 Shaft 2, 42 Rotor frame 3, 43 Rotor magnet 4, 44 Retaining member 5, 45 Thrust plate 6, 46 Bearing 7, 47 Bearing housing 8, 48 Motor mounting plate 9 Core holder 10, 50 Core 11, 51 Thrust Cover 12, 52 Winding 13, 53 Head

Claims (1)

A rotor portion having a rotor frame formed at the center of the shaft and a fastening portion for fixing the shaft, a rotor magnet fixed to the rotor frame, and a retaining member fixed to the rotor frame, and the shaft freely rotatable A bearing housing having a flange on the outer diameter side that holds the bearing on the inner diameter portion thereof and engages with a retaining member formed on the rotor portion to prevent the rotor portion from coming off, and the shaft A thrust receiving portion that supports the shaft in the axial direction, a motor mounting plate that holds the bearing housing, a core that is disposed to face the rotor magnet and winds a winding through an insulating member, and a motor that holds the core and mounts the motor A stator portion provided with a core holder fixed to the plate, and a motor mounting portion of the motor mounting plate; In a motor provided with a step having a slope between a portion for fixing the serial core holder,
Matching the core and the magnetic center of the rotor magnet;
Arranging the relative position in the axial direction of the retaining member and the collar,
Furthermore, a motor height dimension for performing a step of adjusting the axial dimension of the step based on a required value of the motor height dimension defined by the dimension between the motor mounting portion and the axial top surface of the rotor frame. Setting method.

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