JPH06261483A - Resin molded motor - Google Patents

Abstract

PURPOSE:To reduce noise radiated from a motor when the stator and a motor control board are integrally molded by providing a protrusion on the surface of the motor, making a groove in the lead wire lead-out part, and fixing a metal shielding plate to the resin molded part. CONSTITUTION:Stator part 2 and a motor control board are resin molded integrally. Hemispheric protrusions 3a-3d and 3e-3h are provided on the opposite surfaces of a motor. A grooved lead wire lead-out part 4 and a grooved protrusion 5 are also provided and a groove is made between. Protrusions 12 formed at the opposite end parts of a metal shielding plate 1 are fit in the groove. Furthermore, the hemispheric protrusions 3a-3d, 3e-3h are fit in holes made at the intermediate part of the plate 1. This structure reduces noise radiated from the motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin mold electric motor in which a stator and a motor control board are integrated.

[0002]

2. Description of the Related Art Conventionally, since the motor is controlled by the PAM control system, the level of the radiation noise from the motor is low and it does not cause any problem in the actual use of the indoor air conditioner, and the shield plate is used. There wasn't. But PW
When a motor equipped with a board of M control type or the like is used indoors, radiation noise becomes a problem unless a shield plate is used, and a countermeasure is required.

[0003]

When the motor control board is molded integrally with the stator, the effect of noise emitted from the motor on the peripheral devices cannot be ignored depending on the control method of the board to be mounted. Becomes
Noise countermeasures are required.

An object of the present invention is to attach a metal shield plate to a resin-molded motor to reduce noise radiated from the motor.

[0005]

Means for Solving the Problems In an electric motor in which a stator and a motor control board are integrally resin-molded, a protrusion is provided on the motor surface when the motor is resin-molded, and a groove is also provided in a lead wire lead-out portion. The structure is to have a metal shield plate attached to reduce the noise radiated from the motor.

[0006]

[Function] A product to which a motor for which a circuit board for PWM control and the like is integrally molded with a stator is applied is applied. Especially, noise radiated from the motor mounted on a product used indoors has an influence on other peripheral devices. It is necessary to give due consideration.

According to the present invention, in order to reduce this radiation noise, a protrusion is provided on the surface of the motor when the motor is molded with a resin, and at the same time, a groove is also provided at the lead wire lead-out portion to attach a metal shield plate, It is possible to reduce radiation noise.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic structure in which a metal shield plate is attached to an electric motor in which a stator and a motor control board are integrally resin-molded to reduce noise emitted from the motor. In FIG. 1, 1 is a metal shielding plate, 2 is a resin-molded motor stator,
Reference numeral 3 is a hemispherical projection provided on the surface of the motor for fixing the shield plate 1, and this is also provided on the opposite side. Reference numeral 4 is a lead provided with a groove for fixing the shield plate 1. The wire lead-out portions 5 are protrusions provided with grooves for fixing the shield plate 1, and the protrusion 12 of the shield plate is inserted between the grooved lead wire lead-out portion 4 and the grooved protrusion 5. Next, it is fitted into the hemispherical projection 3 on the surface of the motor near the lead-out portion. Finally, the shield plate is fitted into the hemispherical projection 3 that is far from the projecting portion, and the shield plate is attached to the motor.

FIG. 2 is a cross-sectional view of a motor with a metallic shield plate attached. In FIG. 2, 14 is a rotor, 15
Is a stator coil, 16 is a sensor magnet for position detection, and 17 is a motor control board such as a PWM system. Reference numeral 18 denotes a motor driving IC, which is used to control the PWM method and the like. The radiation noise from the motor is reduced by the metal shield plate 1.

FIG. 3 is a detailed view of the metal shield plate.
Reference numeral 10 is a hole for fitting in the hemispherical projection 3 provided on the surface of the motor. Reference numeral 11 denotes a convex portion provided inside in order to avoid the embrace tightening spring 7 in FIG. 1, and thereby prevents contact with the shield plate. Reference numeral 12 is a convex portion for fitting into the grooved lead wire lead-out portion 4 and the grooved protrusion portion 5.

FIG. 4 is a view in which a shielding plate is inserted between the groove of the lead wire lead-out portion and the groove of the protrusion provided on the surface of the motor. By providing 12 convex portions in the center of the width of the shielding plate, the shape of the shielding plate is common to the left and right, and workability is improved.

By attaching the metallic shielding plate to the motor as described above, the noise radiated from the motor can be reduced.

[0014]

According to the present invention, when the motor is molded with resin, a protrusion is provided on the surface of the motor, and at the same time, a groove is provided in the lead-out portion of the lead wire. The shield plate can be securely attached to the motor without using such a device, and thereby noise emitted from the motor can be reduced.

[Brief description of drawings]

FIG. 1 is a front view and a right side view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a motor equipped with a metal shielding plate used in the present invention.

FIG. 3 is a front view and a right side view of a metal shielding plate used in the present invention.

FIG. 4 is a detailed view of a groove of a protrusion and a lead wire lead-out portion.

[Explanation of Codes] 10 ... Metal Shielding Plate, 3 ... Hemispherical Protrusion on Motor Surface, 4 ... Groove Lead Wire Lead-out, 5 ... Groove Protrusion, 10 ... Hemispherical Protrusion , 12 ... Groove insertion shield plate projections, 17 ... Motor control board.

Claims (1)

[Claims] 1. An electric motor in which a stator and a motor control board are integrally resin-molded, wherein a metal shield plate is attached to a resin mold portion on the surface of the motor to reduce radiation noise generated from the motor. Resin mold electric motor that does.