WO2018076478A1

WO2018076478A1 - Washing machine

Info

Publication number: WO2018076478A1
Application number: PCT/CN2016/109312
Authority: WO
Inventors: 吴迪; 陈金涛; 诸自强; 胡义明; 王洪晓
Original assignee: 广东威灵电机制造有限公司; 美的威灵电机技术（上海）有限公司
Priority date: 2016-10-31
Filing date: 2016-12-09
Publication date: 2018-05-03

Abstract

A washing machine (100) comprising an outer drum (10), an inner drum (20), and a motor (30). The motor (30) comprises a stator (31), a first rotor part (32), and a second rotor part (33) respectively rotatable relative to each other and a switching mechanism (34) capable of switching between a washing state and a spin-drying state. The relative position of the stator (31) and that of the outer drum (10) are fixed. When the switching mechanism (34) is in a washing state, the relative position of the stator (31) and that of the second rotor part (33) are fixed, and the first rotor (32) acts as a rotor use for driving the rotation of the inner drum (20); when the switching mechanism (34) is in a spin-drying state, the relative position of the first rotor part (32) and that of the second rotor part (33) are fixed, and the first rotor part (32) and the second rotor part (33) act as rotors used for driving the rotation of the inner drum (20).

Description

washing machine

Technical field

The invention relates to the technical field of washing machine manufacturing, and in particular to a washing machine.

Background technique

At present, the driving mode of the drum washing machine is usually a centralized driving plus belt driving method. This driving and transmission mode often causes noise and energy loss in the work engineering. In the related art, some drum washing machines adopt the outer rotor motor directly. It is installed on the outer tub of the washing machine as a driving component. However, since the washing mode of the washing machine and the dewatering and drying mode have large differences in the rotational speed requirements, in order to balance the two operating states, the drum washing machine using the direct drive motor is usually in the washing state. The efficiency is very low, which causes unnecessary power loss and reduces the user experience.

Summary of the invention

The washing machine in the related art differs by more than 10 times from the rotational speed of the washing state and the dehydrated state. In order to balance the two operating states under a limited voltage, a large outer diameter outer rotor motor is directly mounted on the outer tub of the washing machine as a driving component. Such a drum washing machine using a direct drive motor is generally inefficient in a washing state, and since the washing time is usually as long as one hour, unnecessary electric power loss is caused.

The present invention aims to solve at least one of the above technical problems in the related art to some extent. To this end, the present invention proposes a washing machine which is compact in structure, small in size, low in noise, can change the number of running poles of the motor in different modes, and at the same time effectively balances the energy-efficient operation of the washing machine in the washing mode and the dehydrating mode.

A washing machine according to an embodiment of the present invention includes an outer tub; an inner tub rotatably disposed in the outer tub; and a motor including a stator, a first rotor portion, and a second rotor portion that are respectively rotatable relative to each other And a switching mechanism switchable between a washing state and a dehydrating state, the stator being mounted on the outer tub and fixed in a position opposite to the outer tub, the first rotor portion being drivingly coupled to the inner tub, When the switching mechanism is in the washing state, fixing a relative position of the stator and the second rotor portion, the first rotor portion serving as a rotor for driving the rotation of the inner tub, and the switching mechanism is in the dehydration In the state, the relative positions of the first rotor portion and the second rotor portion are fixed, and the first rotor portion and the second rotor portion serve as a rotor for driving the rotation of the inner tub.

A washing machine according to an embodiment of the present invention can be relatively rotated by arranging the stator, the first rotor portion, and the second rotor portion so that any two of them can be selectively fixed by a switching mechanism, thereby causing the first rotor portion or The first rotor portion and the second rotor portion are respectively formed as rotors capable of driving the inner tub in two working states, thereby realizing the equivalent rotor pole number switching of the motor without changing the connection of the motor windings, thereby adapting to the washing machine Different modes. At the same time, through adoption The direct drive of the motor can effectively simplify the overall structure, reduce the size of the whole machine, and also reduce the noise of the washing machine and the energy consumption of the whole machine. The washing machine has the advantages of compact structure, small volume, low noise, low energy consumption, high torque direct drive, and efficient operation of the washing machine in the washing mode and the dehydration mode.

In addition, the washing machine according to an embodiment of the present invention may further have the following additional technical features:

According to an embodiment of the present invention, the stator, the first rotor portion, and the second rotor portion are sequentially spaced from the outside to the inside in the radial direction of the motor.

According to an embodiment of the present invention, the switching mechanism includes: a stator fixing ring, a fixed position of the stator fixing ring and the stator is fixed; a first rotor fixing ring, the first rotor fixing ring and the first a relative position of the rotor portion is fixed; a second rotor fixing ring, a relative position of the second rotor fixing ring and the second rotor portion is fixed; a driving portion and a sliding ring, the sliding ring is driven to slide by the driving portion, When the switching mechanism is in the washing state, the sliding ring is respectively engaged with the stator fixing ring and the second rotor fixing ring under the driving of the driving portion, and the switching mechanism is in the dehydrating state. The sliding ring is engaged with the first rotor fixing ring and the second rotor fixing ring under the driving of the driving portion.

According to an embodiment of the invention, the driving portion is a control coil that drives the sliding ring to slide by electromagnetic induction.

According to an embodiment of the present invention, the sliding ring, the stator fixing ring, the first rotor fixing ring and the second rotor fixing ring are respectively provided with latching teeth, and the switching mechanism is in the washing state When the latches on the sliding ring respectively engage with the latches on the stator retaining ring and the latches on the second rotor retaining ring, the sliding ring is in the dehydrated state, the sliding ring The upper latches mesh with the latches on the first rotor retaining ring and the latches on the second rotor retaining ring, respectively.

According to an embodiment of the present invention, the latching teeth on the sliding ring are distributed on the outer circumferential surface and the inner circumferential surface of the sliding ring, and the teeth on the stator fixing ring are distributed on the inner circumference of the stator fixing ring. a latch on the first rotor retaining ring is disposed on an outer peripheral surface of the first rotor retaining ring, and a latch on the second rotor retaining ring is distributed on an outer circumference of the second rotor retaining ring On the surface.

According to an embodiment of the present invention, the motor further includes: a stator casing, the stator casing is mounted on the outer tub, the stator is drivingly connected to the stator casing; the rotor casing, the first a rotor portion and the inner tub are respectively connected to the rotor casing; a rotor end cover, the end cap is drivingly connected to the second rotor portion, and the stator fixing ring is drivingly connected to the stator casing, The first rotor retaining ring is in driving connection with the first rotor portion, and the second rotor retaining ring is in driving connection with the rotor end cap.

According to an embodiment of the invention, the rotor casing and the second rotor portion are fitted by bearings.

According to an embodiment of the present invention, the rotor casing is coupled to the inner tub by a support shaft passing through the outer tub Pick up.

According to an embodiment of the invention, the support shaft is a hollow shaft having a circular cross section.

According to an embodiment of the invention, the outer tub is provided with a support seat, and the support shaft is rotatably fitted in the support seat by a bearing. According to an embodiment of the invention,

According to an embodiment of the invention, the stator comprises a stator core of a stator; a stator winding, the stator winding being wound on the stator core.

According to an embodiment of the invention, the second rotor portion comprises a rotor core of the rotor; a permanent magnet, the permanent magnet being disposed on the core of the rotor.

According to an embodiment of the present invention, the first rotor portion includes: a plurality of magnetic cores; a plurality of non-magnetic spacers, a plurality of the magnetic cores and a plurality of the non-magnetic spacers along The circumferential direction of the motor is alternately arranged.

According to an embodiment of the invention, the pole number of the rotating magnetic field generated by the stator is p _s , the pole pair of the exciting magnetic field generated by the second rotor portion is p _f , and the number of the conducting cores is p _r , where p _r =|p _s ±p _f |.

DRAWINGS

1 is a cross-sectional view of a washing machine in a washing state according to an embodiment of the present invention;

Figure 2 is an enlarged view of a portion A of Figure 1;

Figure 3 is a cross-sectional view of the motor of the washing machine shown in Figure 1 in a washing state;

Figure 4 is a cross-sectional view of the washing machine in a dehydrated state in accordance with one embodiment of the present invention;

Figure 5 is an enlarged view of a portion B of Figure 4;

Figure 6 is a cross-sectional view of the motor of the washing machine shown in Figure 4 in a dehydrated state.

Reference mark:

100: washing machine;

10: outer barrel;

20: inner barrel;

30: motor;

31: stator; 311: stator core; 312: stator winding;

32: a first rotor portion; 321: a magnetic core; 322: a non-magnetic spacer;

33: a second rotor portion; 331: a rotor core; 332: a permanent magnet;

34: switching mechanism;

341: driving portion; 342: sliding ring;

35: stator fixing ring;

36: a first rotor retaining ring;

37: a second rotor retaining ring;

40: stator housing;

50: rotor casing;

60: bearing;

70: support shaft;

80: Support seat.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A washing machine 100 according to an embodiment of the present invention will be specifically described below with reference to FIGS. 1 through 6.

The washing machine 100 according to an embodiment of the present invention includes an outer tub 10, an inner tub 20, and a motor 30. Specifically, the inner tub 20 is rotatably disposed in the outer tub 10, and the motor 30 includes a stator 31 that is relatively rotatable, a first rotor portion 32, a second rotor portion 33, and a switchable switch between a washing state and a dehydrating state. Agency 34.

Wherein, the stator 31 is mounted on the outer tub 10 and is fixed to the outer tub 10, the first rotor portion 32 is drivingly connected to the inner tub 20, and the relative position of the fixed stator 31 and the second rotor portion 33 is when the switching mechanism 34 is in the washing state. The first rotor portion 32 serves as a rotor for driving the rotation of the inner tub 20, and when the switching mechanism 34 is in the dehydrated state, the relative positions of the first rotor portion 32 and the second rotor portion 33 are fixed, the first rotor portion 32 and the second rotor portion 33 acts as a rotor for driving the rotation of the inner tub 20.

In other words, the washing machine 100 is mainly composed of the outer tub 10, the inner tub 20, and the motor 30. The outer tub 10 and the inner tub 20 respectively extend in the axial direction (the left-right direction as shown in FIG. 1), and the outer tub 10 is fixed on a casing (not shown) of the washing machine 100, and the inner tub 20 is rotatably sleeved in the outer tub 10. And being disposed coaxially with the outer tub 10, so that the inner tub 20 has rotational independence with respect to the outer tub 10, and then the inner tub 20 is driven to rotate by the motor 30, thereby driving the rotation of the laundry to be washed in the inner tub 20 to achieve washing and dehydrating purposes. .

Further, the motor 30 is mainly composed of a stator 31, a first rotor portion 32, a second rotor portion 33, and a switching mechanism 34, and the stator 31, the first rotor portion 32, and the second rotor portion 33 are formed substantially in a cylindrical shape, and Arranged coaxially in the axial direction (left-right direction as shown in FIG. 1), any two of the stator 31, the first rotor portion 32, and the second rotor portion 33 can be relatively rotated, that is, the first rotor The portion 32 can be rotated relative to the stator 31 or the second rotor portion 33, At this time, the second rotor portion 33 may also perform a rotational motion with respect to the first rotor portion 32 or the stator 31. At the same time, the stator 31 is disposed on the outer tub 10 and fixed to the opposite position of the outer tub 10, that is, the stator 31 and the outer tub 10 are relatively stationary, and the first rotor portion 32 is drivingly coupled to the inner tub 20, that is, the first rotor portion. The movement between the 32 and the inner tub 20 can be synchronous, or can be synchronized without moving, thereby realizing the driving of the inner tub 20 by the motor 30.

Further, when the washing machine 100 is in the washing state, the switching mechanism 34 fixes the relative position between the stator 31 and the second rotor portion 33 (shown in FIG. 1) such that the stator 31 and the second rotor portion 33 function as the motor 30. The stator is stationary with respect to the outer tub 10. At this time, the first rotor portion 32 is rotatable relative to the stator 31 and the second rotor portion 33 and drives the inner tub 20 to rotate, that is, as the rotor of the motor 30, thereby making the motor 30, etc. The efficiency pole is high, and the large torque, low speed and high efficiency operation state of the washing machine 100 is realized.

When the washing machine 100 is in the dehydrated state, the switching mechanism 34 fixes the relative position between the first rotor portion 32 and the second rotor portion 33 (shown in FIG. 4) such that the first rotor portion 32 and the second rotor portion 33 act as motors The double rotor of 30 rotates synchronously with respect to the outer tub 10 and the stator 31, thereby driving the inner tub 20 to rotate, thereby making the equivalent pole pair of the motor 30 low, thereby realizing the small torque high-speed and high-efficiency operation state of the washing machine 100. Thereby, the switching between the washing state and the dehydration state is realized by the switching mechanism 34, and the equivalent rotor pole number and the operating point frequency of the motor 30 are adjusted, thereby realizing the pole-changing operation of the washing machine 100.

Thus, the washing machine 100 according to the embodiment of the present invention can be relatively rotated by arranging the stator 31, the first rotor portion 32, and the second rotor portion 33 so that any two of them can be selectively fixed by the switching mechanism 34. The position such that the first rotor portion 32 or the first rotor portion 32 and the second rotor portion 33 are respectively formed as rotors that can drive the inner tub 20 in two operating states, and thus without changing the winding connection of the motor 30 The switching between the number of rotor poles of the motor 30 and the operating frequency is implemented to accommodate different modes of the washing machine 100. At the same time, by using the motor 30 for high torque direct drive, the overall structure can be simplified, the overall machine volume can be reduced, and the running noise of the washing machine 100 and the energy consumption of the whole machine can also be reduced. The washing machine 100 has a compact structure, small volume, low noise, low energy consumption, and can realize high torque direct drive, and at the same time effectively balance the high energy efficiency operation of the washing machine 100 in the washing mode and the dehydration mode.

In some embodiments of the present invention, the stator 31, the first rotor portion 32, and the second rotor portion 33 are sequentially spaced from the outside to the inside in the radial direction of the motor 30.

Specifically, as shown in FIGS. 1 and 2, the stator 31, the first rotor portion 32, and the second rotor portion 33 are formed in a substantially circular cross section, and the stator 31, the first rotor portion 32, and the second rotor portion 33 are formed. Arranged in the radial direction of the motor 30 from the outside to the inside, that is, the first rotor portion 32 is located inside the stator 31 and outside the second rotor portion 33, and the three are spaced apart to avoid any Interference occurs when the two rotate relative to each other, thereby ensuring the normal operation of the washing machine 100.

Wherein, the switching mechanism 34 includes a stator fixing ring 35, a first rotor fixing ring 36, a second rotor fixing ring 37, and a driving Portion 341 and slip ring 342. The relative position of the stator fixing ring 35 and the stator 31 is fixed, the relative position of the first rotor fixing ring 36 and the first rotor portion 32 is fixed, the relative position of the second rotor fixing ring 37 and the second rotor portion 33 is fixed, and the sliding ring 342 is When the driving unit 341 is driven to slide, and the switching mechanism 34 is in the washing state, the sliding ring 342 is engaged with the stator fixing ring 35 and the second rotor fixing ring 37 under the driving of the driving portion 341, and the sliding ring 342 is when the switching mechanism 34 is in the dehydrated state. The first rotor retaining ring 36 and the second rotor retaining ring 37 are respectively engaged by the driving portion 341.

Specifically, as shown in FIGS. 2 and 5, the switching mechanism 34 is mainly composed of a stator fixing ring 35, a first rotor fixing ring 36, a second rotor fixing ring 37, a driving portion 341, and a slip ring 342. The stator fixing ring 35 is formed substantially in a circular ring structure, and the relative positions of the stator fixing ring 35 and the stator 31 are fixed, that is, the stator fixing ring 35 is fixedly connected with the stator 31; the first rotor fixing ring 36 and the first rotor portion 32 are The relative position is fixed, the first rotor retaining ring 36 and the first rotor portion 32 can move synchronously, or can not move synchronously; the relative position of the second rotor retaining ring 37 and the second rotor portion 33 is fixed, that is, the second rotor The fixing ring 37 and the second rotor portion 33 can move synchronously or synchronously. The sliding ring 342 is disposed adjacent to the stator fixing ring 35, the first rotor fixing ring 36, and the second rotor fixing ring 37, and can be driven by the driving portion 341. The movement is performed in the axial direction (the left and right directions as shown in FIGS. 1 and 4), thereby switching between different states of the motor 30, thereby realizing the pole-changing operation of the washing machine 100.

When the switching mechanism 34 is in the washing state (as shown in FIG. 2), the slide ring 342 is driven by the driving portion 341, one end is engaged with the stator fixing ring 35, and the other end is engaged with the second rotor fixing ring 37, so that the stator 31 is caused. The relative position of the second rotor portion 33 is fixed (ie, does not move synchronously). At this time, the first rotor portion 32 is formed as a rotor that rotates relative to the stator 31, so that the equivalent pole number of the motor 30 is relatively high, thereby implementing the washing machine. 100 high torque low speed and efficient operation.

When the switching mechanism 34 is in the dehydrated state (as shown in FIG. 3), the sliding ring 342 is driven by the driving portion 341, one end is engaged with the first rotor fixing ring 36, and the other end is engaged with the second rotor fixing ring 37, thereby The relative positions of the first rotor portion 32 and the second rotor portion 33 are fixed (i.e., may be synchronized or synchronized), and at this time, the first rotor portion 32 and the second rotor portion 33 are formed as a rotor that rotates relative to the stator 31, thereby The equivalent pole pair number of the motor 30 is made lower, thereby achieving a small torque high speed and high efficiency operation state of the washing machine 100.

Alternatively, the driving portion 341 is a control coil that slides the sliding ring 342 by electromagnetic induction. By making the driving portion 341 a control coil that can slide the sliding ring 342 by electromagnetic induction, the wiring inside the motor 30 can be simplified, making the overall structure of the motor 30 simpler.

Optionally, the sliding ring 342, the stator fixing ring 35, the first rotor fixing ring 36 and the second rotor fixing ring 37 are respectively provided with latching teeth, and when the switching mechanism 34 is in the washing state, the latching teeth on the sliding ring 342 are respectively The latches on the stator retaining ring 35 engage with the latches on the second rotor retaining ring 37. When the switching mechanism 34 is in the dehydrated state, the latches on the slip ring 342 and the latches on the first rotor retaining ring 36 and the first The latches on the two rotor retaining rings 37 engage.

As shown in FIG. 2 and FIG. 5, the sliding ring 342 is formed substantially in a cylindrical structure. The inner wall and the outer wall of the sliding ring 342 of the cylindrical structure are respectively provided with engaging teeth, and the outer wall of the first rotor fixing ring 36 is provided. a latching tooth is provided on the outer wall of the second rotor retaining ring 37, and the latching teeth on the inner wall of the sliding ring 342 can engage with the latches on the outer walls of the first rotor retaining ring 36 and the second rotor retaining ring 37, and slide The latches on the outer wall of the ring 342 can be engaged with the latches on the inner wall of the stator retaining ring 35, thereby enhancing the sliding ring 342 and the stator retaining ring 35, the first rotor retaining ring 36 and the second rotor by the cooperation of the engaging teeth. The reliability of the connection between the rings 37 ensures the normal operation of the motor 30.

The latching teeth on the sliding ring 342 are distributed on the outer circumferential surface and the inner circumferential surface of the sliding ring 342, and the latching teeth on the stator fixing ring 35 are distributed on the inner circumferential surface of the stator fixing ring 35 on the first rotor fixing ring 36. The latching teeth are distributed on the outer peripheral surface of the first rotor retaining ring 36, and the latching teeth on the second rotor retaining ring 37 are distributed on the outer peripheral surface of the second rotor retaining ring 37.

Specifically, the inner circumferential surface and the outer circumferential surface of the sliding ring 342 are respectively provided with engaging teeth, the outer circumferential surface of the first rotor fixing ring 36 is provided with a latching tooth, and the outer peripheral surface of the second rotor fixing ring 37 is provided with a latching tooth. The engaging teeth on the inner circumferential surface of the sliding ring 342 can be engaged with the engaging teeth on the outer circumferential surfaces of the first rotor fixing ring 36 and the second rotor fixing ring 37, and the engaging teeth on the outer circumferential surface of the sliding ring 342 can be coupled to the stator fixing ring 35. The engaging teeth on the inner circumferential surface cooperate to enhance the connection reliability between the sliding ring 342 and the stator fixing ring 35, the first rotor fixing ring 36 and the second rotor fixing ring 37 by utilizing the cooperation between the teeth, thereby ensuring the motor 30 normal operation.

When the switching mechanism 34 is in the washing state (as shown in FIG. 2), the engaging teeth on the inner circumferential surface of the sliding ring 342 mesh with the engaging teeth on the outer peripheral surface of the second rotor retaining ring 37, and the card on the outer peripheral surface of the sliding ring 342 The teeth mesh with the teeth on the inner circumferential surface of the stator fixing ring 35, thereby ensuring the transmission connection of the stator 31 and the second rotor portion 33, and the stator 31 and the second rotor portion 33 are not rotated synchronously; when the switching mechanism 34 is in a dehydrated state (eg In the position shown in FIG. 5, the engaging teeth on the inner circumferential surface of the sliding ring 342 simultaneously mesh with the engaging teeth on the outer circumferential surfaces of the first rotor fixing ring 36 and the second rotor fixing ring 37, thereby ensuring the first rotor portion 32 and the first The transmission connection of the two rotor portions 33 allows the first rotor portion 32 and the second rotor portion 33 to move synchronously or synchronously.

Further, the motor 30 further includes a stator casing 40, a rotor casing 50, and a rotor end cover (not shown). The stator casing 40 is mounted on the outer tub 10, and the stator 31 is drivingly coupled to the stator casing 40, and the first rotor portion 32 is provided. And the inner barrel 20 is respectively connected to the rotor casing 50, the end cover is drivingly connected to the second rotor portion 33, the stator fixing ring 35 is drivingly connected to the stator casing 40, and the first rotor fixing ring 36 is drivingly connected to the first rotor portion 32. The second rotor retaining ring 37 is in driving connection with the rotor end cap.

Specifically, as shown in FIG. 2, the stator casing 40 is formed substantially in a cylindrical structure whose one end (upper end) is open and is fixedly coupled to the outer tub 10, and the stator 31, the first rotor portion 32, and the stator 31 are along the stator casing. The radial directions of the 40 are sequentially spaced apart from the outside to the inside of the stator casing 40 and disposed coaxially, thereby protecting the internal components of the motor 30 through the stator casing 40 to avoid accidental damage.

At the same time, between the stator 31 and the stator casing 40, the first rotor portion 32 and the inner tub 20 and the rotor casing 50 connected thereto Between the end cap and the second rotor portion 33, between the stator retaining ring 35 and the stator casing 40, between the first rotor retaining ring 36 and the first rotor portion 32, and between the second rotor retaining ring 37 and A transmission connection is adopted between the two rotor portions 33 and the rotor end cover, that is, between the stator 31 and the stator casing 40, between the first rotor portion 32 and the inner tub 20 and the rotor casing 50 connected thereto, and the end Between the cover and the second rotor portion 33, between the stator retaining ring 35 and the stator casing 40, between the first rotor retaining ring 36 and the first rotor portion 32, and between the second rotor retaining ring 37 and the second rotor portion 33 Synchronous motion or synchronous non-motion between the rotor end cover and the rotor end cover. For example, in the present embodiment, there is no relative movement between the stator 31 and the stator casing 40, and the stator casing 40 is in a fixed state, and the stator 31 is also in a fixed state. .

The rotor housing 50 and the second rotor portion 33 are coupled by a bearing 60.

Specifically, as shown in FIG. 2, the outer circumferential surface of the rotor casing 50 is fitted to the inner circumferential surface of the bearing 60, and the inner circumferential surface of the second rotor portion 33 is fitted to the outer circumferential surface of the bearing 60, thereby securing the second rotor portion through the bearing 60. 33 has independent rotation with respect to the rotor casing 50.

Alternatively, the rotor casing 50 is drivingly coupled to the inner tub 20 by a support shaft 70 that passes through the outer tub 10.

Referring to FIG. 2, the rotor casing 50 is coaxially and fixedly connected to the support shaft 70 of the outer tub 10, and is indirectly connected to the inner tub 20 through the support shaft 70 of the outer tub 10, that is, the rotor casing 50 and the inner tub. The movement between the two can be synchronized or synchronized, so that the rotation of the inner tub 20 of the washing machine 100 is rotated by the rotation of the rotor casing 50, thereby achieving the washing of the laundry in the inner tub 20.

Wherein, the support shaft 70 is a hollow shaft whose cross section is annular. The support shaft 70 is configured as a hollow shaft having a circular cross section, which can ensure the coaxiality of the support shaft 70 and the rotor casing 50, and can reduce the load of the rotor casing 50 and reduce energy consumption.

Optionally, the outer tub 10 is provided with a support base 80, and the support shaft 70 is rotatably fitted in the support base 80 through a bearing 60.

As shown in FIG. 2, the cross section of the support base 80 is formed substantially in the shape of an inverted boss. One end (such as the left end) of the support shaft 70 is connected to the rotor casing 50, and the other end (such as the right end) of the support shaft 70 is connected to the inner tub 20, and is supported. The shaft 70 is coaxially threaded within the support base 80 and rotatably coupled to the support base 80 by bearings 60 to ensure rotational independence and coaxial position of the support shaft 70 and the rotor housing 50 relative to the support base 80.

The stator 31 includes a stator core 311 and a stator winding 312, and the stator winding 312 is wound on the stator core 311.

Referring to FIG. 1 and FIG. 2, the stator 31 is mainly composed of a stator core 311 and a stator winding 312. The stator core 311 is made of a highly magnetic material. The high magnetic material may be a silicon steel sheet, a cobalt steel sheet or a permalloy. , SMC and other materials. The stator winding 312 is wound on the stator core 311. The stator winding 312 may be a concentrated winding or a distributed winding. That is, the span of the stator winding 312 may be 1 or other integers, and at the same time, the stator winding 312 The number of phases can be single or multi-phase such that the stator winding 312 passes an AC current to generate a magnetic field. It is worth noting that the stator core is The specific material of 311, the winding form of stator winding 312, and the number of phases of stator winding 312 can be adaptively selected to ensure torque and power density of motor 30 in accordance with actual design requirements.

The second rotor portion 33 includes a rotor core 331 and a permanent magnet 332, and the permanent magnet 332 is disposed on the rotor core 331.

Specifically, as shown in FIG. 1, the second rotor portion 33 is mainly composed of a rotor core 331 and a permanent magnet 332 which is provided on the rotor core 331 and which is uniform in the circumferential direction of the rotor core 331. Arrangement. The rotor core 331 is made of a highly magnetically permeable material, which may be a silicon steel sheet, a cobalt steel sheet, a permalloy, an SMC or the like. The permanent magnet 332 is mainly composed of a permanent magnet material, and the permanent magnet material may be a material such as neodymium iron boron, ferrite, aluminum nickel cobalt, samarium cobalt or the like. The permanent magnet 332 may be combined with the rotor core 331 by surface mount (SPM), built-in (IPM), surface mount (Inset PM), etc., for example, in one example of the present invention, the permanent magnet 332 The rotor core group 331 is embedded in the same polarity of the adjacent permanent magnets, thereby ensuring the stability of the structure of the second rotor portion 33, thereby generating an exciting magnetic field.

Optionally, the permanent magnets 332 are formed substantially in an elongated structure, and the number of the permanent magnets 332 is 12, and the plurality of elongated permanent magnets 332 are circumferentially inserted into the rotor in a circumferential direction with the same polarity of the adjacent permanent magnets. The magnetic core 331 is guided, and the long sides of the elongated permanent magnets 332 are arranged in the radial direction (as shown in FIGS. 3 and 6). Of course, the number of the permanent magnets 332 may also be 8. The long sides of the elongated permanent magnets 332 are arranged in the circumferential direction. Meanwhile, the shape of the permanent magnets 332 may also be an arc shape, and the plurality of permanent magnets 332 of the curved structure are The rotor magnet cores 331 are embedded in the circumferential direction in such a manner that the adjacent permanent magnets are of the same polarity, and the arc-shaped sides of the arc-shaped permanent magnets 332 are arranged in the circumferential direction. It should be noted that those skilled in the art can change the number, shape and arrangement of the permanent magnets 332 according to actual design requirements, so as to adjust the equivalent rotor pole pairs and the working electric frequency, so that when the output mechanical speed is the same, it can be switched. The different operating states of the motor 30, such as the washing state and the dewatering state, enable the pole-changing operation of the washing machine 100.

The first rotor portion 32 includes a plurality of cores 321 and a plurality of non-magnetic spacers 322, and the plurality of cores 321 and the plurality of non-magnetic spacers 322 are alternately arranged along the circumferential direction of the motor 30.

Referring to FIG. 3, the first rotor portion 32 is mainly composed of a plurality of cores 321 and a plurality of non-magnetic spacers 322, and a plurality of cores 321 and a plurality of non-magnetic spacers 322 are alternated along the circumference of the motor 30. Arranged at intervals, the conductive core 321 is made of a highly magnetically permeable material, and the high magnetic conductive material may be a silicon steel sheet, a cobalt steel sheet, a permalloy, an SMC or the like. The non-magnetic spacing block 322 is made of a non-magnetic material, and the non-magnetic material may be air, plastic, polymer, non-magnetic metal or the like.

Further, the stator 31 is driven by an alternating current and the number of pole pairs of the generated rotating magnetic field is p _s , the number of pole pairs of the exciting magnetic field generated by the second rotor portion 33 is p _f , and the number of the conductive core 321 is p _r . , p _r =|p _s ±p _f |.

Specifically, the stator 31 is driven by an alternating current and generates a rotating magnetic field having a pole pair number p _s , and the second rotor portion 33 generates an exciting magnetic field having a pole pair number p _f , and the number of the magnetic conductive cores 321 is p _r , and The number of the conductive cores 321 is equal to the sum of the number of pole pairs of the rotating magnetic field and the number of pole pairs of the exciting magnetic field or the difference between the two, thereby ensuring that the motor 30 can operate normally under different operating conditions.

A drum washing machine 100 according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 through 6 through a plurality of specific embodiments.

As shown in FIG. 1, FIG. 2 and FIG. 3, the main structure of the drum washing machine 100 in the embodiment of the present invention includes the outer tub 10 of the washing machine 100, the inner tub 20 of the washing machine 100, and the main components of the pole-changing variable-pressure motor 30 for direct driving. The outer tub 10 of the washing machine 100 is fixed to the casing of the washing machine 100 as a basis for the power structure of the present invention. The inner tub 20 of the washing machine 100 is tightly coupled to the support shaft 70, and maintains a fixed axial position and rotational independence with the outer tub 10 of the washing machine 100 through the bearing 60.

The pole-changing electric motor 30 includes main components such as the stator 31, the first rotor portion 32, the second rotor portion 33, and the switching mechanism 34. In detail, the stator 31 of the motor 30 includes a stator 31 core composed of a highly magnetically permeable material, a stator winding 312 wound thereon, and a stator casing 40, wherein the stator casing 40 is fixed to the outer tub 10 of the washing machine 100 by bolts. on. In the present embodiment, the stator winding 312 is a three-phase symmetrical fractional-slot winding with a coil span of 1, and a three-phase symmetrical current is passed to generate a rotating magnetic field with a pole-number ps=8.

The first rotor portion 32 includes a core 321 of a high magnetic permeability material and a non-magnetic spacer 322. The first rotor portion 32 is directly fixed to the support shaft 70 by a screw to drive the inner tub 20 of the washing machine 100 to rotate. The number of blocks is pr=14.

The second rotor portion 33 includes a rotor core 331 made of a highly magnetically permeable material, and a permanent magnet 332 arranged in a built-in manner. The permanent magnets 332 are evenly arranged in the circumferential direction in such a manner that the adjacent permanent magnets 332 have the same polarity. The permanent magnetic field of the pole pair pf=6, the second rotor portion 33 maintains relative rotational independence and axial position with the first rotor portion 32 via the bearing 60.

The switching mechanism 34 of the present embodiment is of an electromagnetic type and includes main components such as a drive coil, a stator fixing ring 35, a first rotor fixing ring 36, a second rotor fixing ring 37, and a drive ring. The drive ring is a ring gear having a toothed tooth on the radially inner side and the outer side. The first rotor retaining ring 36 and the second rotor retaining ring 37 are radially outer toothed ring gears, and the stator fixed ring 35 is radially inner toothed. Ring gear.

In the washing state of the drum washing machine 100, the drive coil drives the drive ring to move to the position shown in Figs. 1 and 2, and the stator retaining ring 35 and the second rotor retaining ring 37 are engaged, thereby keeping the second rotor portion 33 and the stator 31 The fixed relative position and serves as the stator of the pole-changing electric motor 30. In this state, the first rotor portion 32 drives the inner tub 20 of the washing machine 100 as a single rotating component of the motor 30 at a low speed and large torque washing operation. At this time, the motor The equivalent operating pole number of 30 is pr=14.

In the dehydrating operation state, the drum washing machine 100 drives the coil drive drive ring to the position shown in FIGS. 4 and 5 to engage the first rotor retaining ring 36 and the second rotor retaining ring 37. In this state, the stator 31 is The fixing member, the first rotor portion 32 and the second rotor portion 33 are locked and held in a relatively fixed position as the rotor of the pole-changing electric motor 30, The inner tub 20 of the washing machine 100 is driven to perform high-speed dehydration operation. At this time, the equivalent running pole of the motor 30 is ps=8.

Therefore, the drum washing machine 100 can switch between the number of rotor poles and the operating frequency of the motor 30 without changing the winding connection of the motor 30, thereby adapting to different modes of the washing machine 100. At the same time, by using the motor 30 for high torque direct drive, the overall structure can be simplified, the overall machine volume can be reduced, and the running noise of the washing machine 100 can be reduced. The washing machine 100 has a compact structure, a small volume, low noise, and can realize high torque direct drive, and at the same time effectively balances the high-efficiency operation of the washing machine 100 in the washing mode and the dehydration mode.

Other configurations and operations of the washing machine in accordance with embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are understood. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and a simplified description, and does not indicate or imply that the device or component referred to has a specific orientation and is constructed in a specific orientation. And the operation is therefore not to be construed as limiting the invention.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Further, various embodiments or examples described in this specification can be joined and combined by those skilled in the art.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A washing machine, comprising:

Outer bucket

An inner tub, the inner tub being rotatably disposed in the outer tub;

a motor including a respectively rotatable stator, a first rotor portion, a second rotor portion, and a switching mechanism switchable between a washing state and a dehydrating state, the stator being mounted on the outer tub and The relative position of the outer tub is fixed, and the first rotor portion is drivingly connected to the inner tub.

When the switching mechanism is in the washing state, fixing a relative position of the stator and the second rotor portion, the first rotor portion serving as a rotor for driving the rotation of the inner tub,

When the switching mechanism is in the dehydration state, fixing a relative position of the first rotor portion and the second rotor portion, the first rotor portion and the second rotor portion functioning to drive the inner tub rotation The rotor.
The washing machine according to claim 1, wherein the stator, the first rotor portion, and the second rotor portion are sequentially spaced from the outside to the inside in the radial direction of the motor.
The washing machine according to claim 1, wherein the switching mechanism comprises:

a stator fixing ring, the relative position of the stator fixing ring and the stator is fixed;

a first rotor retaining ring, the relative position of the first rotor retaining ring and the first rotor portion being fixed;

a second rotor retaining ring, the relative position of the second rotor retaining ring and the second rotor portion being fixed;

a driving portion and a slip ring, the sliding ring being driven to slide by the driving portion

When the switching mechanism is in the washing state, the sliding ring is respectively engaged with the stator fixing ring and the second rotor fixing ring under the driving of the driving portion.

When the switching mechanism is in the dehydrated state, the sliding ring is engaged with the first rotor fixing ring and the second rotor fixing ring under the driving of the driving portion.
The washing machine according to claim 3, wherein the driving portion is a control coil that drives the sliding ring to slide by electromagnetic induction.
The washing machine according to claim 3, wherein the sliding ring, the stator fixing ring, the first rotor fixing ring and the second rotor fixing ring are respectively provided with latching teeth.

When the switching mechanism is in the washing state, the latches on the sliding ring respectively mesh with the latches on the stator retaining ring and the latches on the second rotor retaining ring.

When the switching mechanism is in the dehydrated state, the latches on the slip ring respectively mesh with the latches on the first rotor retaining ring and the latches on the second rotor retaining ring.
The washing machine according to claim 5, wherein the latches on the slide ring are distributed in the sliding a peripheral surface of the ring and an inner peripheral surface of the ring, the teeth on the stator fixing ring are distributed on an inner circumferential surface of the stator fixing ring, and the teeth on the first rotor fixing ring are distributed in the first rotor On the outer peripheral surface of the retaining ring, the latching teeth on the second rotor retaining ring are distributed on the outer peripheral surface of the second rotor retaining ring.
The washing machine according to any one of claims 3-6, wherein the motor further comprises:

a stator casing, the stator casing is mounted on the outer tub, and the stator is drivingly connected to the stator casing;

a rotor casing, wherein the first rotor portion and the inner tub are respectively drivingly connected to the rotor casing;

a rotor end cover, the end cover being drivingly connected to the second rotor portion,

The stator retaining ring is drivingly coupled to the stator housing, the first rotor retaining ring is drivingly coupled to the first rotor portion, and the second rotor retaining ring is drivingly coupled to the rotor end cap.
The washing machine according to claim 7, wherein the rotor casing and the second rotor portion are fitted by bearings.
The washing machine according to claim 7, wherein the rotor casing is drivingly coupled to the inner tub by a support shaft passing through the outer tub.
The washing machine according to claim 9, wherein the support shaft is a hollow shaft having a circular cross section.
The washing machine according to claim 9, wherein said outer tub is provided with a support seat, and said support shaft is rotatably fitted in said support seat by a bearing.
The washing machine according to any one of claims 1 to 11, wherein the stator comprises:

Stator magnetic core;

A stator winding wound on the stator core of the stator.
The washing machine according to claim 12, wherein the second rotor portion comprises:

Rotor core;

a permanent magnet, the permanent magnet being disposed on the rotor core.
The washing machine according to claim 13, wherein said first rotor portion comprises:

a plurality of magnetic cores;

a plurality of non-magnetically-permeable spacer blocks, a plurality of the magnetic conductive cores and a plurality of the non-magnetic magnetic spacer blocks are alternately arranged along a circumferential direction of the motor.
The washing machine according to claim 14, wherein the number of poles of the rotating magnetic field generated by the stator is ps, the number of pole pairs of the exciting magnetic field generated by the second rotor portion is pf, and the magnetic core of the magnetic core The number is pr, where pr=|ps±pf|.