JPWO2018123576A1 - motor - Google Patents

Abstract

The motor of the present invention includes a stator, a rotor, a bearing, a mold part, and a bracket. The stator includes a stator core extending in the axial direction, a winding wound around the stator core, and an insulating portion positioned between the stator core and the winding. The rotor is positioned to face the stator via a gap. The rotor includes a rotating shaft having an axial center as a rotation center, and a rotating body that extends in the axial direction and is attached to the rotating shaft. The insulating part is formed of a resin having a flash point of 330 ° C. or higher. Alternatively, the insulating part is formed of a resin having an ignition temperature of 420 ° C. or higher. Or an insulating part is formed with resin whose melting temperature is 250 degreeC or more.

Description

  The present invention relates to a motor used in an air conditioner and the like, and more particularly, to a fan motor designed to improve safety.

  Conventionally, fan motors (hereinafter also simply referred to as “motors”) used in air conditioners and the like have temperature-sensitive elements attached to the windings wound around the stator coil as a safety measure in the event of an abnormal condition. There is something. The temperature to be detected is set in advance for the temperature sensitive element attached to the winding.

  With this configuration, for example, when an unexpected current flows through the winding, it is possible to prevent the temperature of the winding from continuing to rise and the motor from firing.

  Specifically, when a current continues to flow through the winding, the temperature of the winding continues to rise. When the temperature of the winding rises to a predetermined value, a temperature sensitive element attached to the winding detects that the temperature of the winding has reached a predetermined temperature. When the temperature sensitive element detects that the temperature of the winding has reached a predetermined temperature, the controller that drives the fan motor stops the current flowing through the winding, or reduces the current flowing through the winding. Thus, the temperature rise of the winding is suppressed.

  Therefore, even if the motor is in an abnormal state, it is possible to prevent an accident that causes the motor to ignite. A technique for preventing such ignition of the motor is disclosed (for example, see Patent Document 1).

JP 2007-49783 A

  The motor of the present invention includes a stator, a rotor, a bearing, a mold part, and a bracket.

  The stator includes a stator core extending in the axial direction, a winding wound around the stator core, and an insulating portion positioned between the stator core and the winding.

  The rotor is located facing the stator via a gap. The rotor includes a rotating shaft having an axial center as a rotation center, and a rotating body that extends in the axial direction and is attached to the rotating shaft.

  The bearing supports the rotating shaft so as to be rotatable.

  The mold part covers the opposite side of the stator where the stator faces the rotor with a resin mold.

  The bracket is located at the end in the axial direction and is attached to the mold part while holding the bearing.

  The insulating part is formed of a flame retardant or heat resistant resin.

  In particular, the insulating part is formed of a resin having a flash point of 330 ° C. or higher.

  Alternatively, the insulating portion is formed of a resin having an ignition temperature of 420 ° C. or higher. Or an insulating part is formed with resin whose melting temperature is 250 degreeC or more.

  According to such a configuration, since the insulating portion is formed using a resin material having high heat resistance and flame retardancy, it is possible to prevent fire and smoke from leaking outside the motor, and the safety of the motor is improved. improves.

FIG. 1 is a half sectional view of a motor according to an embodiment of the present invention as seen from the side.

  As will be described later, the motor according to the embodiment of the present invention forms an insulating portion using a resin material having high heat resistance and flame retardancy, thereby improving the safety of the motor.

  That is, the conventional method including the above-described technique has the following points to be improved. That is, when a failure occurs in the temperature sensitive element, the temperature of the winding cannot be detected. Therefore, even if the motor is in an abnormal state, a signal notifying that the winding temperature has reached the predetermined temperature is not transmitted from the temperature sensitive element to the control unit that drives the fan motor. Thus, the winding temperature continues to rise. As a result, the conventional motor cannot be safely stopped. In the worst case, the conventional motor may lead to ignition.

  Therefore, in the embodiment of the present invention, even if the protection device attached to the motor stops functioning, the safety of the motor is improved so that the motor does not ignite.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.

(Embodiment)
FIG. 1 is a half sectional view of a motor according to an embodiment of the present invention as viewed from the side. The motor in the present embodiment will be described with reference to FIG. In addition, the following description demonstrates and demonstrates the fan motor used for an air conditioner.

  As shown in FIG. 1, the motor 100 according to the present embodiment includes a stator 10, a rotor 20, a bearing 30, a mold part 40, and a bracket 50.

  The stator 10 includes a stator core 11 that extends in the direction of the axis 21 a, a winding 12 that is wound around the stator core 11, and an insulating portion 13 that is positioned between the stator core 11 and the winding 12.

  The rotor 20 is located facing the stator 10 via a gap. The rotor 20 includes a rotating shaft 21 having the shaft center 21 a as a rotation center, and a rotating body 22 that extends in the direction of the shaft center 21 a and is attached to the rotating shaft 21.

  The pair of bearings 30 (30a, 30b) rotatably supports the rotating shaft 21.

  The mold part 40 covers the opposite side of the stator 10 where the stator 10 faces the rotor 20 with a resin mold 41.

  The bracket 50 is located at the end of the motor 100 in the direction of the axis 21a, and is attached to the mold part 40 while holding the bearing 30a.

  The insulating part 13 is an insulating member and is formed of a resin having a flash point of 330 ° C. or higher. More preferably, the resin forming the insulating portion 13 should have a flash point of 350 ° C. or higher.

  In addition, forms that exhibit particularly remarkable actions and effects are as follows.

  That is, the insulating part 13 used for the motor 100 in the present embodiment is formed of a resin having an ignition temperature of 420 ° C. or higher. More preferably, the resin forming the insulating portion 13 should have an ignition temperature of 480 ° C. or higher.

  Insulating portion 13 used in motor 100 in the present embodiment is formed of a resin having a melting temperature of 250 ° C. or higher. More preferably, the resin forming the insulating portion 13 should have a melting temperature of 280 ° C. or higher.

  Alternatively, in the motor 100 according to the present embodiment, the resin that forms the insulating portion 13 has a noncombustible decomposition gas.

  Furthermore, it demonstrates in detail with drawing.

  As shown in FIG. 1, the stator core 11 can be composed of a substantially annular yoke and teeth protruding from the inner peripheral surface of the yoke toward the axis 21a. A winding 12 is wound around the tooth via an insulating portion 13. A resin mold 41 is molded on the outer peripheral side of the stator core 11 around which the winding 12 is wound, and a mold portion 40 is formed. A rotor 20 is attached to the inner peripheral side of the stator core 11 via a gap. The rotor 20 is rotatably held by the bearing 30. A bracket 50 is attached to the stator 10.

  Specifically, the resin material forming the insulating portion 13 is a liquid crystal polymer (also called Liquid Crystal Polymer, also referred to as LCP resin), polyphenylene sulfide (also referred to as Poly Phenylylene Sulfide, PPS resin), polyphthalamide (Polyphthalamide, PPA resin). The main component is any one of unsaturated polyester (unsaturated polyester), polyether ether ketone (also referred to as polyether ether ketone, also referred to as PEEK resin), and phenol (also referred to as phenol formaldehyde, PF resin). . In particular, BMC (Bulk Molding Compound) can be used as a resin mainly composed of unsaturated polyester.

  In particular, the resin mold 41 is formed of a resin mainly composed of an unsaturated polyester, and only aluminum hydroxide can be used as the powder filler. In particular, the resin mold 41 can use BMC as a resin mainly composed of unsaturated polyester.

  With this configuration, the heat resistance of the insulating portion 13 is improved. Therefore, according to the present embodiment, even if an abnormal current continues to flow through the winding 12 and the temperature of the winding 12 reaches a high temperature, the insulating portion 13 melts and generates flammable gas. There is no. Therefore, since the flammable gas is not filled in the motor 100, the gas is ignited for some reason and the motor does not ignite. As a result, the safety of the motor in the present embodiment is improved.

  In the above description, the inner rotor type motor is used as the motor. The present invention can also be applied to an outer rotor type motor.

  The motor of the present invention is also useful for a fan motor used in a refrigerator or the like.

DESCRIPTION OF SYMBOLS 10 Stator 11 Stator core 12 Winding 13 Insulation part 20 Rotor 21 Rotating shaft 21a Shaft center 22 Rotating body 30, 30a, 30b Bearing 40 Mold part 41 Resin mold 50 Bracket 100 Motor

Claims (7)

A stator core extending in the axial direction;
Windings wound around the stator core;
An insulating part located between the stator core and the winding;
A stator having
Located facing the stator via a gap,
A rotation axis centered on the axis;
A rotating body that extends in the axial direction and is attached to the rotating shaft;
A rotor having
A bearing that rotatably supports the rotating shaft;
In the stator, a mold part that covers the opposite side of the stator facing the rotor with a resin mold,
A bracket that is located at an end in the axial direction and that holds the bearing and is attached to the mold part;
With
A motor in which the insulating part is formed of a flame-retardant or heat-resistant resin. The motor according to claim 1, wherein the insulating portion is formed of a resin having a flash point of 330 ° C. or higher. The motor according to claim 1, wherein the insulating portion is formed of a resin having an ignition temperature of 420 ° C. or higher. The motor according to claim 1, wherein the insulating part is formed of a resin having a melting temperature of 250 ° C. or higher. The motor according to claim 1, wherein the resin forming the insulating portion has a non-combustible decomposition gas. 2. The motor according to claim 1, wherein the resin is mainly composed of any one of a liquid crystal polymer, polyphenylene sulfide, polyphthalamide, unsaturated polyester, polyether ether ketone, and phenol. The motor according to claim 1, wherein the resin mold is formed of a resin mainly composed of unsaturated polyester, and uses only aluminum hydroxide as a powder filler.

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