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Permanent-magnet motor and washing machine

A permanent magnet motor and washing machine technology, applied in the washing machine field, can solve the problems of high induced voltage, output drop, insulation damage of electronic components, etc., and achieve the effect of efficient adjustment

Active Publication Date: 2014-03-26
TOSHIBA LIFESTYLE PROD & SERVICES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, if the rotor is composed of only permanent magnets with a large coercive force, the induced voltage due to the permanent magnets during high-speed rotation (during the dehydration process) becomes extremely high, which may cause insulation breakdown of electronic components, etc.
On the other hand, if the rotor is composed of only permanent magnets with a small coercive force, the output during low-speed rotation (during the washing process, during the rinsing process) will drop.

Method used

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  • Permanent-magnet motor and washing machine
  • Permanent-magnet motor and washing machine
  • Permanent-magnet motor and washing machine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0038] Next, for the first embodiment in which the present invention is applied to a drum washing machine, refer to Figure 1 to Figure 7 Be explained.

[0039] First, in Figure 7 Among them, the water tank 2 is arranged in the outer case 1 of the drum type washing machine. The water tank 2 is a rear portion 2a (in the Figure 7 (a) is a closed substantially cylindrical shape, and is elastically supported by a damper mechanism (not shown) with its axial direction substantially horizontal. The drum 3 constituting the rotary tank is rotatably arranged in the water tank 2 . This cylinder 3 is also in the rear portion 3a as an end portion (in Figure 7 (a) is a closed substantially cylindrical shape, and it arrange|positions in the state which made the axial direction into substantially horizontal. The drum 3 has a plurality of holes (not shown) on its peripheral wall. Moreover, although not shown in figure, the front part 1a of the outer case 1 is provided with the door wh...

no. 2 Embodiment

[0076] Figure 8 as well as Figure 9 Shows the second embodiment of the present invention. For the above-mentioned first embodiment (particularly refer to figure 1 ) are denoted by denoting the same parts with the same reference numerals.

[0077] The rotor core 13 is formed by laminating a plurality of core materials as described in the first embodiment. Here, the rotor 5 is configured using n pieces (for example, n=39) of core materials from the first core material 131 to the nth core material 13n.

[0078] Such as Figure 8 As shown, in this second embodiment, on the first iron core material 131 located on the end surface side of one of the two ends of the axial direction of the rotor core 13, the permanent magnets 14, 15 located between adjacent ones are formed. There are recesses 19 and magnetic flux flow paths 22 . Additionally, if Figure 9 As shown, on the n-th piece of iron core material 13n located on the other end surface side of both ends in the axial dire...

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Abstract

A permanent-magnet motor is provided with a stator (7) having stator coils (10) for each of the phases that are wound around a stator core (9), and a magnetic pole teeth (8) formed corresponding to the stator coils (10) for each of the phases; a rotor (5) that is equipped with a rotor core (13) having multiple magnet-inserting holes (17) formed in the circumferential direction, and that has permanent magnets, which form magnetic poles corresponding to the magnetic pole teeth (8) of the stator (7), inserted into the magnet-inserting holes (17); and magnetic sensors (H1 through H3) that detect the positions of the magnetic poles of the rotor (5). The permanent magnets are selected, and inserted, from among multiple types of permanent magnets (14, 15) having different coercive forces, so as to make it one type per pole; a magnetic-flux flow path (22) that protrudes into the stator (7) side is formed on the rotor core (13), at a section positioned between two permanent magnets (14, 15) that are adjacent to each other and have different coercive forces; and the magnetic sensors (H1 through H3) will move relatively along a locus (21) that corresponds to the permanent magnets (14, 15) and the magnetic-flux flow path (22), in accordance to the rotation of the rotor (5).

Description

technical field [0001] The present invention relates to a permanent magnet motor provided with a plurality of permanent magnets on a rotor, and a washing machine using the permanent magnet motor. Background technique [0002] An inverter (inverter) driving method, which is relatively easy to control the speed, is often used in the control of a permanent magnet motor used in, for example, a drum washing machine. For this drive control, a magnetic sensor that detects the magnetic pole position of a rotor having permanent magnets as a magnetic pole is provided (for example, refer to Patent Document 1). [0003] In addition, in the permanent magnet motor used in the drum type washing machine, it is desirable to adjust it appropriately according to the low-speed rotation (washing stroke, rinsing stroke) and high-speed rotation (during the dehydration stroke) of the drum as the driving washing machine load. The magnetic flux (induced voltage) of the permanent magnets interlinked ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K29/08H02K1/18H02K1/22H02K1/27H02K11/00H02K21/22
CPCH02K2213/03H02K29/08H02K29/03H02K1/2786H02K1/2791H02K1/18H02K1/27H02K21/22
Inventor 志贺刚
Owner TOSHIBA LIFESTYLE PROD & SERVICES CORP