JP2018098918A - Motor and washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which the number of parts for fixing a thermal protector increases and the cost increases.SOLUTION: A recess is formed in a rotation sensor along a shape of a thermal protector. The thermal protector is buried in the recess and is fixed by an elastic force of a hook portion provided in the rotation sensor.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motor, and also relates to a washing machine using the same.

  The main motor of the current vertical washing machine is often equipped with a DC brushless motor to reduce power consumption during operation and to suppress noise, and the DC brushless motor can freely control the rotation speed. It is driven by PWM control.

  When clothes get caught in the washing wing and the rotation of the washing wing locks and overloads, an excessive current flows through the DC brushless motor for a long time, and the current causes the armature winding to generate heat. To. In addition, DC brushless motors are operated with three-phase AC energization, but in rare cases, they may be operated with two-phase energization due to failure or disconnection of the drive circuit. The amount of heat generated by the armature winding increases, and in the worst case, smoke and fire are generated. In order to protect these smoke and ignition, a protective part called a thermal protector is attached to the armature winding. A thermal protector is a two-terminal electronic component that is normally connected between terminals, but when the temperature exceeds a set temperature, the internal bimetal is inverted and the circuit is cut off. The thermal protector attached to the DC brushless motor takes this terminal into the control circuit and observes the armature winding temperature. Examples of using a thermal protector for detecting the temperature of a DC brushless motor are disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2005-143210) and Patent Document 2 (Japanese Patent No. 3004220).

JP 2005-143210 A Patent 3004220

  As a method of attaching a thermal protector to the armature winding of a DC brushless motor, there is a method of installing a thermal protector at the end of the armature winding and fixing it with a binding band, but the insulation class of the DC brushless motor is When the temperature is high, it is necessary to increase the heat resistance temperature of the binding band, which increases the cost of the binding band. Further, when a plurality of thermal protectors are attached in order to reduce the smoke generation risk of the DC brushless motor, the cost increases accordingly. According to the present invention, a thermal protector can be attached without using a binding band, and a DC brushless motor with reduced number of parts and cost can be provided.

  The stator includes a rotor that rotates relative to the stator, and the stator is provided with a rotation sensor that detects a magnetic pole position of the rotor, and the stator is armature-wound. In a magnet motor in which a wire is wound and a thermal protector for temperature detection is mounted on the armature winding, the rotation sensor is formed with a recess along the shape of the thermal protector, and the thermal protector is It is embedded in the recess and is fixed by an elastic force of a hook portion provided in the rotation sensor.

  A DC brushless motor with a reduced number of parts and reduced costs can be provided.

1 is a schematic view of a vertical washing machine according to an embodiment of the present invention. 1 is a plan view of a DC brushless motor according to an embodiment of the present invention. It is sectional drawing of FIG. 2 of the DC brushless motor concerning one Embodiment of this invention. It is an attachment exploded view of a rotation sensor concerning one embodiment of the present invention. It is the attachment exploded view of the thermal protector concerning one Embodiment of this invention. It is a top view of the rotation sensor in connection with one Embodiment of this invention. It is sectional drawing of FIG. 6 of the rotation sensor in connection with one Embodiment of this invention. It is the front view and side view of a stator which concern on one Embodiment of this invention. It is a half sectional view of the rotor in connection with one embodiment of the present invention.

  Hereinafter, a vertical washing machine 100 according to an embodiment of the present invention and a magnet motor used therein will be described with reference to FIGS.

  FIG. 1 is a schematic view of a vertical washing machine 100 according to this embodiment. The vertical washing machine 100 includes a housing 110 at the outermost shell and includes an outer tub 112 that includes a washing tub 113 as an inner tub. The housing 110 and the outer tub 112 are connected by a damping rod 111. Yes. A flange 115 is provided below the outer tub 112, and the flange 115 is provided with a clutch portion 116 and a DC brushless motor 1. The clutch portion 116 and the stirring blade 114 are connected by a shaft 120. The clutch portion 116 includes a pulley 117 and the DC brushless motor 1 includes a pulley 118. The pulley 117 and the pulley 118 are connected by a belt 119, and the DC brushless motor Power is transmitted to the clutch portion 116 to rotate the stirring blade 114.

  2 is a plan view of the DC brushless motor according to the present invention, FIG. 3 is a sectional view of the DC brushless motor according to the present invention, FIG. 4 is an exploded view of the rotation sensor, FIG. 5 is an exploded view of the thermal protector, and FIG. 7 is a plan view of the rotation sensor, FIG. 7 is a sectional view of the rotation sensor, FIG. 8 is a front view and a side view of the stator, and FIG. 9 is a half sectional view of the rotor. The DC brushless motor 1 is formed of a stator 10 and a rotor 30, an output side end bracket 70, and a counter output side end bracket 80, and the stator 10 is a three-phase winding in a slot 12 formed in the stator core 11. An armature winding 13 is wound, and the stator core 11 and the armature winding 13 are electrically insulated by an insulator 14. In the rotor 30, a plurality of permanent magnets 32 are embedded in a rotor core 31, a shaft 34 is fitted at the center of the rotor core 31, and bearings 35 and 36 are fitted at both ends of the previous shaft 34. Has been. The outer diameter of the stator 10 is fitted to the inner diameters of the output side end bracket 70 and the counter output side end bracket 80, and the rotor 30 is provided on the inner diameter side of the stator 10. A cylindrical recess is formed in the bracket 80, and bearings 35 and 36 are contained therein. The output side end bracket 70 and the non-output side end bracket 80 are coupled together by screws 90. A rotation sensor 40 is fastened to the stator 10 by a screw 50 in order to detect the position of the permanent magnet 32 embedded in the rotor 30. A thermal protector 60 is fixed to detect the temperature of the armature winding 13. The rotation sensor 40 has three sensor insertion holes 41, a fitting hole 42 with the insulator 14, an insertion part 43 of the thermal protector 60, a hook part 44 that restrains the axial movement of the thermal protector 60, A screwing hole 45 with the insulator 14 is provided.

  Next, a method for assembling the DC brushless motor 1 and a method for attaching the rotation sensor 40 and the thermal protector 60 will be described. First, the stator 10 is fitted into the non-output side end bracket 80, and then the bearing 36 of the rotor 30 is inserted into the non-output side end bracket 80. Subsequently, the rotation sensor 40 and the insulator 14 are coupled by the screw 50, and the thermal protector 60 is inserted from the radial direction. Subsequently, the output-side end bracket 70 is fitted into the stator 10, and the non-output-side end bracket 80 is fixed with screws 90. Since the hook portion 44 of the rotation sensor can be elastically deformed like 44a, the thermal protector 60 can be easily inserted. After the insertion, the hook portion 44 returns to its original shape. It doesn't move. Further, the movement in the circumferential direction is constrained by the insertion portion 43, and the movement in the axial direction is constrained by the hook portion 44. Therefore, the thermal protector 60 is constrained in all directions, and the temperature of the armature winding 13 is accurately set. It can be detected. Further, since the armature winding 13 is wound several tens of times, the height in the axial direction varies, but the hook portion 44 moves freely within the range of elastic deformation in the axial direction after insertion. The thermal protector 60 and the armature winding 13 are always in contact with each other.

  As described above, according to the present embodiment, a thermal protector can be attached without using a binding band, and a DC brushless motor with reduced number of parts and cost can be provided.

1 DC brushless motor 10 Stator 11 Stator core 12 Slot 13 Armature winding 14 Insulator 30 Rotor 31 Rotor core 32 Magnet 34 Shaft 35 Bearing 36 Bearing 40 Rotation sensor 41 Sensor insertion hole 41 Anti-output shaft side housing 42 Fitting hole 43 Thermal protector insertion part 44 Hook part 45 Screw fixing hole 50 Screw 60 Thermal protector 70 Output side end bracket 80 Opposite output side end bracket 80
90 screw 100 vertical washing machine 110 housing 111 damping rod 112 outer tub 113 washing tub 114 stirring wing 115 flange 116 clutch part 117 pulley 118 pulley 119 belt 120 shaft

Claims (3)

A stator and a rotor that rotates with respect to the stator are provided. A rotation sensor that detects a magnetic pole position of the rotor is attached to the stator in the previous period, and an armature winding is wound around the stator. In the motor in which the armature winding is equipped with a thermal protector for temperature detection,
The rotation sensor has a recess formed along the shape of a thermal protector, and the thermal protector is embedded in the recess and fixed by an elastic force of a hook portion provided in the rotation sensor. Motor. The motor according to claim 1, wherein
A motor having one or two recessed hook portions.   A washing machine to which the motor according to claim 1 or 2 is applied.

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