Motor for cooking equipment and cooking equipment

Abstract

The utility model discloses a cooking equipment motor and cooking equipment, the motor is constructed to have various rotating speeds, the motor comprises a stator assembly and a mover assembly, the stator assembly comprises a stator iron core and a stator winding, the stator iron core is provided with a plurality of stator slots, the stator winding is wound around the plurality of stator slots, and the mover assembly is provided with a plurality of rotor windings. The rotor assembly comprises a plurality of permanent magnets coupled with the stator winding, the number of the stator grooves is m, the number of pole pairs of the rotor assembly is p, and the motor meets the conditions that m is larger than or equal to 12 and smaller than or equal to 24, and 2p is larger than or equal to 10 and smaller than or equal to 20. The motor used for the cooking equipment provided by the embodiment of the utility model is small in size, low in cost and low in noise, and can output low-speed high torque under the condition of low current, so that the motor can be compatible with high-speed and low-speed operation, and the performance of the motor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the motor technical field of cooking equipment, especially a motor for cooking equipment and cooking equipment. BACKGROUND

[0002] When the motor is applied to the multifunctional cooking equipment, the multifunctional cooking equipment needs not only to be used for high-speed stirring of food materials, but also to be used for low-speed cooking or dough mixing, so the motor needs to meet high-speed and low-speed rotation at the same time.

[0003] However, the existing motor for the multifunctional cooking equipment generally adopts a series excited motor or a brushless direct current motor, and is affected by the mechanical characteristics of the motor, so that the high-speed and low-speed compatibility of the motor is not good, and problems such as insufficient torque at low-speed rotation or unable to meet the speed standard at high-speed rotation may occur.

[0004] Among them, the maximum torque density of the existing motor is only 12 mN.m / cm 3 -14 mN.m / cm 3 .

[0005] In the prior art, in order to solve the above problems, a speed reduction structure is added to the motor, the motor is replaced by a reluctance motor or the outer diameter of the motor is increased, but in the above technical solutions, the torque density of the motor is only 8 mN.m / cm 3 -12 mN.m / cm 3 , and the volume of the motor is also increased, which increases the cost of the motor and causes the motor to easily produce noise. INVENTION CONTENTS

[0006] The utility model aims at least to solve one of the technical problems existing in the prior art. Therefore, the utility model provides a motor, which has small size, low cost and low noise, and can output low-speed high torque under low current, so that the motor can be compatible with high-speed and low-speed operation, and the technical problems of poor high-speed and low-speed compatibility of the motor in the prior art or the increase of the volume, cost and noise of the motor when ensuring the high-speed and low-speed compatibility of the motor are solved.

[0007] The utility model also aims at providing a cooking equipment with the above motor.

[0008] According to the motor for the cooking equipment, the motor is configured to have multiple rotating speeds, and the motor comprises: a stator assembly, the stator assembly comprises a stator core and a stator winding, the stator core is provided with multiple stator slots, and the stator winding is wound on the multiple stator slots; a rotor assembly, the rotor assembly comprises multiple permanent magnets coupled with the stator winding, the number of slots of the stator slot is m, the number of pole pairs of the rotor assembly is p, and the motor satisfies: 12≤m≤24 and 10≤2p≤20.

[0009] According to the motor, by setting the value range of the number of slots m of the stator slot and the number of pole pairs p of the rotor assembly, the least common multiple of the number of slots m and the number of pole pairs p can be increased, so that the cogging torque in the motor operation process is reduced, the vibration and noise level of the motor are reduced, the motor can output low-speed high torque under low current, the motor can be compatible with high-speed and low-speed operation, the motor has the advantages of small size, low cost and low noise, and the overall performance of the motor is improved.

[0010] In some embodiments, the stator split ratio of the motor is α, and the motor satisfies 0.5<α≤0.7.

[0011] In some embodiments, the torque density of the motor is 15mN.m / cm 3 -17mN.m / cm 3 .

[0012] In some embodiments, the rotating speed n of the motor is ≤500r / min, and the torque T is ≥2.5N.m.

[0013] In some embodiments, the motor is a brushless direct current motor, and a motor shaft of the brushless direct current motor is connected with a stirring piece.

[0014] In some embodiments, the stator assembly comprises multiple-phase stator windings, each phase of the stator winding comprises a multiple-turn coil disc, and the motor further comprises: a control module, the control module is electrically connected with the multiple-phase stator windings respectively to control the on-off state of each turn of the coil disc, and the motor is configured to change the flux linkage of the motor by changing the number of turns of the stator winding used.

[0015] In some embodiments, each phase of the stator winding comprises a first part and a second part, the first part comprises at least one turn of the coil disc, the second part comprises multiple turns of the coil disc, the multiple turns of the coil disc are connected in series, the number of turns of the first part is less than the number of turns of the second part, and the control module controls the first part or the second part to be energized to change the flux linkage of the motor.

[0016] In some embodiments, the plurality of turns of the coil disc of each phase of the stator winding are connected in parallel.

[0017] In some embodiments, each phase of the stator winding includes a third portion and a fourth portion, the third portion includes a plurality of turns of the coil disc, the fourth portion includes at least one turn of the coil disc, the number of turns of the fourth portion is less than the number of turns of the third portion, and the control module controls the third portion or the fourth portion to be energized to change the flux linkage of the motor.

[0018] In some embodiments, each phase of the stator winding includes a third portion and a fourth portion, the third portion includes a plurality of turns of the coil disc, the fourth portion includes at least one turn of the coil disc, the number of turns of the fourth portion is less than the number of turns of the third portion, and the control module controls the third portion or the fourth portion to be energized to change the flux linkage of the motor.

[0019] In some embodiments, each phase of the stator winding includes a third portion and a fourth portion, the third portion includes a plurality of turns of the coil disc, the fourth portion includes at least one turn of the coil disc, the number of turns of the fourth portion is less than the number of turns of the third portion, and the control module controls the third portion or the fourth portion to be energized to change the flux linkage of the motor.

[0020] The cooking equipment according to the embodiment of the present application, comprising: a motor, the motor is the motor mentioned above; a stirring piece, the stirring piece is connected with a motor shaft of the motor, the motor shaft rotates synchronously with the mover assembly.

[0021] The cooking equipment according to the embodiment of the present application, by adopting the motor mentioned above, the working performance of the cooking equipment is ensured, the size, cost and working noise of the cooking equipment are avoided to be increased to a certain extent, and the user experience is improved.

[0022] In some embodiments, the cooking equipment is a chef machine or a dough kneader.

[0023] The additional aspects and advantages of the present application will become apparent from the following description, or will be appreciated by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings, in which:

[0025] Figure 1 It is an exploded view of the motor of some embodiments of the present application.

[0026] Figure 2 It is an exploded view of the stator assembly of some embodiments of the present application.

[0027] Figure 3 It is a schematic view of the stator core of some embodiments of the present application.

[0028] Figure 4A schematic view of a rotor core of some embodiments of the present application.

[0029] Figure 5 A relationship curve diagram of a stator slot ratio and an electromagnetic torque of some embodiments of the present application.

[0030] Figure 6 A wiring diagram of a stator winding of some embodiments of the first aspect of the present application.

[0031] Figure 7 A wiring diagram of a stator winding of some embodiments of the second aspect of the present application.

[0032] Figure 8 A wiring diagram when a third part of a stator winding of some embodiments of the second aspect of the present application is energized.

[0033] Figure 9 A wiring diagram when a fourth part of a stator winding of some embodiments of the second aspect of the present application is energized.

[0034] Figure 10 A wiring diagram of a stator winding of some embodiments of the third aspect of the present application.

[0035] Figure 11 A wiring diagram when a fifth part of a stator winding of some embodiments of the third aspect of the present application is energized.

[0036] Figure 12 A wiring diagram when a sixth part of a stator winding of some embodiments of the third aspect of the present application is energized.

[0037] Reference signs:

[0038] 1000, motor;

[0039] 100, stator assembly;

[0040] 110, stator core; 111, stator slot;

[0041] 120, stator winding; 121, coil disc;

[0042] 130, wire holder;

[0043] 200, control module;

[0044] 300, mover assembly; 310, rotor core; 320, motor shaft;

[0045] 400, first end cover; 500, second end cover; 600, support bearing. DETAILED DESCRIPTION

[0046] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application.

[0047] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0048] It should be noted that the existing cooking equipment generally outputs a rotating speed of 50r / min~12000r / min, and the maximum output power of the motor is generally between 5000W~1000W, wherein when the motor is running at low speed and the rotating speed is ≤500r / min, the output torque of the motor needs to be ≥2.5N.m, and when the motor is running at high speed, the output torque of the motor needs to be ≥0.5N.m, but the motors of the existing cooking equipment on the market mostly adopt 9-slot 6-pole or 6-slot 4-pole, resulting in the problem of insufficient torque when the motor is running at low speed.

[0049] Based on the design principle of the motor: Tem=KT*Im, KT=CT*φ, CT=(60 / 2π)*Ce=p*N / (60a), Ψf=N*φ, wherein Tem is the electromagnetic torque; KT is the torque coefficient; Im is the armature current; CT is the torque constant; φ is the air gap flux per pole; Ce is the counter electromotive force constant; p is the number of pole pairs; N is the total number of stator winding conductors; a is the number of armature winding parallel branches; and Ψf is the magnetic linkage.

[0050] Therefore, if the torque of the motor is to be improved, it can be achieved by increasing the torque coefficient KT or increasing the armature current Im, but the increase of the armature current Im will result in the increase of copper loss, the increase of heat generation, and the increase of temperature rise, so the best way is to increase the torque coefficient KT, that is, to increase the torque constant CT or the air gap flux per pole φ, that is, to increase the number of pole pairs p, the total number of stator winding conductors N and the air gap flux per pole φ.

[0051] Based on this, the motor 1000 can ensure that the low-speed torque is as high as possible under the condition of low armature current, and can meet the high-speed whipping of food of the cooking equipment, so that the motor 1000 is more suitable for the cooking equipment.

[0052] The motor 1000 for the cooking equipment is described below with reference to the drawings of the specification.

[0053] The motor 1000 is configured to have multiple rotation speeds. That is, the motor 1000 can output a high rotation speed, or a low rotation speed, or a medium rotation speed, the medium rotation speed being lower than the high rotation speed and higher than the low rotation speed, so that the motor 1000 can output multiple rotation speeds, improve the working performance of the motor 1000, and be beneficial to expanding the application range of the motor 1000.

[0054] As shown in Figure 1 , the motor 1000 according to the embodiment of the present application comprises a stator assembly 100 and a rotor assembly 300.

[0055] As shown in Figure 1 , Figure 2 and Figure 3 , the stator assembly 100 comprises a stator core 110 and a stator winding 120, the stator core 110 is provided with a plurality of stator slots 111, and the stator winding 120 is wound on the plurality of stator slots 111. Thus, the stator winding 120 is arranged on the stator core 110, so as to reduce the assembly difficulty of the stator assembly 100.

[0056] In some embodiments, as shown in Figure 1 and Figure 2 , the stator assembly 100 further comprises a wire holder 130, and the stator winding 120 is arranged on the stator core 110 through the wire holder 130. In addition to arranging the stator winding 120 on the stator core 110, the wire holder 130 can also reduce the fixing difficulty of the stator winding 120 and improve the position stability of the stator winding 120, so as to ensure the working performance of the stator winding 120 to a certain extent.

[0057] As shown in Figure 1 and Figure 4 , the rotor assembly 300 comprises a plurality of permanent magnets, the plurality of permanent magnets are coupled with the stator winding 120, the number of slots of the stator slot 111 is m, the number of pole pairs of the rotor assembly 300 is p, and the motor 1000 satisfies: 12≤m≤24, 10≤2p≤20.

[0058] The plurality of permanent magnets and the stator winding 120 are coupled to form magnetic coupling between the stator assembly 100 and the mover assembly 300, so as to realize the coupling of the stator assembly 100 and the mover assembly 300, and the stator assembly 100 and the mover assembly 300 are reliably connected by the magnetic field, so as to control the reciprocating rotation of the mover assembly 300, reduce the rotation difficulty of the mover assembly 300, and ensure the working performance of the motor 1000.

[0059] In a specific example, the stator winding 120 is supplied with three-phase alternating current to generate a rotating magnetic field, and the stator assembly 100 and the mover assembly 300 are magnetically coupled to realize the reciprocating rotation of the mover assembly 300.

[0060] It should be further pointed out that when 2p<10, the same torque will result in a larger volume of the motor 1000; when 2p>20, more magnetic poles are needed, that is, more permanent magnets are needed, resulting in higher cost of the motor 1000 and lower production efficiency of the motor 1000.

[0061] Correspondingly, when m<12, the number of turns per slot of the motor 1000 is large, the winding end is high, the end loss is large, and the efficiency of the motor 1000 is affected; when m>24, the number of slots is large, the winding efficiency is low, and the area utilization rate of each slot is low.

[0062] Therefore, the motor 1000 is designed as an m-slot 2p-pole scheme, wherein 12≤m≤24 and 10≤2p≤20, the least common multiple of m and 2p is as large as possible, the cogging torque of the motor 1000 during operation can be reduced.

[0063] The cogging torque of the motor 1000 during operation is reduced, the vibration and noise level of the motor 1000 is reduced, the low-speed performance of the motor 1000 is improved, the motor 1000 can output low-speed high-torque under low current, and the motor 1000 can be compatible with high-speed and low-speed operation, which is beneficial to improve the overall performance of the motor 1000.

[0064] At the same time, by setting the pole pair number p of the mover assembly 300 to satisfy 10≤2p≤20, the volume and cost of the motor 1000 are reduced, and the production efficiency of the motor 1000 is improved, so that the motor 1000 of the application is not only compatible with high-speed and low-speed operation, but also has the advantages of small size, low cost and low noise.

[0065] In a specific example, the motor 1000 adopts 12-slot 10-pole to increase the least common multiple of the slot and pole of the motor 1000, effectively improving the low-speed torque and torque density of the motor 1000.

[0066] From the above structure, the motor 1000 of the embodiment of the utility model, through setting the slot number m of stator slot 111 and the pole pair number p of rotor assembly 300 value range, can make the least common multiple of slot number m and pole pair number p increase, realize reducing the cogging torque in the running process of motor 1000, can reduce the vibration and noise level of motor 1000, and also can make motor 1000 can output low speed high torque under low current, so that the motor 1000 can be compatible with high and low speed operation.

[0067] Meanwhile, through the above-mentioned mode, the high and low speed compatibility of the motor 1000 is ensured, and the volume of the motor 1000 and the noise generated by the motor 1000 during operation can be avoided to a certain extent, so that the motor 1000 has small size, low level and low noise.

[0068] In summary, the motor 1000 of the present application not only can be compatible with high and low speed operation, but also has the advantages of small size, low cost and low noise.

[0069] It can be understood that, compared with the prior art, the motor 1000 of the present application can not only be compatible with high and low speed operation, but also has the advantages of small size, low cost and low noise.

[0070] In some embodiments, when the motor 1000 is running at high speed, a reverse current If can be added on the direct axis to offset a part of the magnetic field and reduce the effective magnetic flux φ, thereby improving the high speed of the motor 1000, and further enabling the motor 1000 of the present application to be compatible with high and low speed operation and improve the working performance of the motor 1000.

[0071] In some embodiments, as shown in Figure 1 The rotor assembly 300 further includes a rotor core 310, and the permanent magnets are arranged on the rotor core 310 to facilitate the coupling of the plurality of permanent magnets with the stator winding 120, thereby ensuring the working performance of the motor 1000.

[0072] In some embodiments, as shown in Figure 1 The rotor assembly 300 is located on the inner side of the stator assembly 100. That is, the motor 1000 of the present application forms an internal rotor motor, which not only facilitates the movement, but also allows the motor 1000 to provide sufficient torque and power output while maintaining a small volume, and the internal rotor structure generally has fewer components, which helps to reduce the weight and complexity of the motor 1000, thereby reducing the cost and manufacturing difficulty of the motor 1000, so that the motor 1000 is compact in structure and facilitates the lightweight design of the motor 1000.

[0073] Meanwhile, the mover assembly 300 is arranged at the inner side of the stator assembly 100, so that heat can be directly conducted to the shell of the motor 1000 and then dissipated through a cooling system (such as a fan or a heat sink), thereby helping to reduce the heat accumulation of the motor 1000 during operation and improving the operation efficiency and service life of the motor 1000.

[0074] Of course, in some other embodiments, the mover assembly 300 can also be arranged at the outer side of the stator assembly 100, which is not specifically limited here.

[0075] In some embodiments, as shown in Figure 1 The motor 1000 further includes a first end cover 400 and a second end cover 500, which are respectively connected to the axial two ends of the shell of the stator assembly 100 to form the shell of the motor 1000.

[0076] In some embodiments, the stator split ratio of the motor 1000 is α, and the motor 1000 satisfies 0.5 < α ≤ 0.7. It should be noted that the stator split ratio α of the motor 1000 is an important structural parameter of the motor 1000. For a general permanent magnet synchronous motor, the stator split ratio α is the ratio between the inner diameter Ф2 of the stator core 110 and the outer diameter Ф1 of the stator core 110. In the case where the volume, the number of stator teeth, and the area of the stator slot 111 of the motor 1000 are unchanged, the electromagnetic torque of the motor 1000 is proportional to the stator split ratio α. Therefore, when α ≤ 0.5, the stator split ratio α is too low, the torque density is low, which will lead to a decrease in the electromagnetic torque of the motor 1000. In order to meet the requirement of the electromagnetic torque, it is necessary to increase the volume of the motor 1000, which leads to an increase in the cost of the motor 1000. When α > 0.7, the stator split ratio α is too large, which will reduce the thickness of the stator yoke, increase the magnetic density, and cause saturation, and also weaken the strength of the stator yoke.

[0077] Therefore, the stator split ratio α of the motor 1000 is set to satisfy 0.5 < α ≤ 0.7, which can improve the material utilization rate of the motor 1000, improve the electromagnetic torque of the motor 1000, so that the motor 1000 can output low-speed high torque under low current, and thus the motor 1000 can be compatible with high-speed and low-speed operation, and the working performance of the motor 1000 is improved.

[0078] It should be noted that through simulation design and analysis, the relationship curve between the electromagnetic torque of the motor 1000 and the stator split ratio α is as shown in Figure 5 Figure 5 It can be known that when the stator split ratio α is between 0.5 and 0.7, the electromagnetic torque of the motor 1000 can be effectively improved, and thus the working performance of the motor 1000 is improved.

[0079] ​In specific examples, the stator split ratio a is 0.51, 0.55, 0.6, 0.65, or 0.7, etc.

[0080] It should be further noted that in some embodiments, the outer diameter F1 of the stator core 110 can be kept unchanged, and only the inner diameter F2 of the stator core 110 is changed to change the stator split ratio a.

[0081] In some embodiments, the torque density of the motor 1000 is 15 mN.m / cm 3 , 17 mN.m / cm 3 . This is conducive to improving the low-speed torque and torque density of the motor 1000, so that the motor 1000 can be compatible with high and low speed operation, and the overall performance of the motor 1000 can be improved.

[0082] Specifically, the torque density of the motor 1000 is 15 mN.m / cm 3 , 16 mN.m / cm 3 , or 17 mN.m / cm 3 , etc.

[0083] In some embodiments, the motor 1000 has a rotational speed n≤500 r / min and a torque T≥2.5 N.m. This means that when the rotational speed of the motor 1000 of the present application is ≤500 r / min, the torque of the motor 1000 is ≥2.5 N.m, so that the motor 1000 can output a large torque at low speed, further so that the motor 1000 can be compatible with high and low speed operation, and to some extent, the working performance of the motor 1000 at low speed is guaranteed, so as to guarantee the overall working performance of the motor 1000.

[0084] In some embodiments, the motor 1000 is a brushless DC motor, and the motor shaft of the brushless DC motor is connected to the stirring member. It should be noted that the brushless DC motor has the advantages of high efficiency, energy saving, high reliability, good speed regulation performance, large starting torque, low noise, and small vibration, etc. By setting the motor 1000 as a brushless DC motor, the working performance of the motor 1000 can be effectively improved. When the motor shaft of the brushless DC motor is connected to the stirring member, not only can the stirring member be driven to rotate by the motor 1000 to process the food to be processed by the stirring member, but also the speed reduction structure between the brushless DC motor and the stirring member can be omitted to simplify the structure of the cooking equipment, reduce the assembly difficulty and manufacturing cost of the cooking equipment, and also improve the assembly efficiency of the cooking equipment.

[0085] In some embodiments, in combination with Figure 1 , Figure 2 and Figure 6As shown, the stator assembly 100 comprises a plurality of phase stator windings 120, each phase stator winding 120 comprising a plurality of turns of coil discs 121; the motor 1000 further comprises a control module 200 electrically connected to the plurality of phase stator windings 120 respectively to control the on-off electrical state of each turn of coil disc 121, and the motor 1000 is configured to change the flux linkage of the motor 1000 by changing the number of turns used by the stator winding 120. Thus, the flux linkage and the phase current can be optimally matched, so that the motor 1000 can output high speed and low speed large torque respectively without increasing the volume, cost and noise of the motor 1000, and the output performance is guaranteed, thereby guaranteeing the working performance of the motor 1000.

[0086] It should be noted that the motor 1000 has different requirements for the size of the flux linkage when outputting high speed or outputting low speed large torque, wherein the motor 1000 needs a larger flux linkage when outputting low speed large torque, and a smaller flux linkage when outputting high speed.

[0087] Based on this, the motor 1000 of the application is designed to adjust the flux linkage, specifically, each phase stator winding 120 is set to comprise a plurality of turns of coil discs 121, and a control module 200 is provided to control the on-off electrical state of each turn of coil disc 121, when the control module 200 is used to control the on-off electrical state of each turn of coil disc 121, the number of turns used by the stator winding 120 can be changed, thereby changing the flux linkage of the motor 1000, so as to achieve the optimal matching of the flux linkage and the phase current, so that the motor 1000 can output high speed and low speed large torque respectively without increasing the volume, cost and noise of the motor 1000, and the output performance is guaranteed, thereby guaranteeing the working performance of the motor 1000.

[0088] That is, the motor 1000 of the application not only guarantees the high-low speed compatibility of itself, but also has the advantages of small size, low cost and low noise.

[0089] In summary, the motor 1000 of the embodiment of the application sets each phase stator winding 120 of the stator assembly 100 to comprise a plurality of turns of coil discs 121, and sets a control module 200 electrically connected to the plurality of phase stator windings 120 respectively, so as to control the on-off electrical state of each turn of coil disc 121 by using the control module 200, so as to change the number of turns used by the stator winding 120, thereby changing the flux linkage of the motor 1000, so that the motor 1000 can output high speed and low speed large torque respectively, and the output performance is guaranteed, thereby guaranteeing the working performance of the motor 1000.

[0090] In some embodiments, the plurality of phase stator windings 120 is a three-phase winding.

[0091] In some embodiments, each phase stator winding 120 includes a first part and a second part. The first part includes at least one-turn coil disk 121, and the second part includes multiple-turn coil disks 121 connected in series. The number of turns in the first part is less than the number of turns in the second part. The control module 200 controls the first part or the second part to be energized to change the magnetic flux of the motor 1000. This means that the first part may include a single-turn coil disk 121 or a multi-turn coil disk 121. When the first part includes a multi-turn coil disk 121, the multi-turn coil disks 121 in the first part are connected in series, and the multi-turn coil disks 121 in the second part are connected in series. The number of turns of the multi-turn coil disks 121 connected in series in the first part of each phase stator winding 120 is less than the number of turns of the multi-turn coil disks 121 connected in series in the second part of each phase stator winding 120. This makes the number of turns of the coil disks 121 connected in series in the first part different from the number of turns of the coil disks 121 connected in series in the second part. In this way, when the control module 200 controls the first part or the second part to be energized, the magnetic flux of the motor 1000 can be changed, so that the motor 1000 can output high speed and low speed high torque respectively, and ensure the output performance, thereby ensuring the working performance of the motor 1000.

[0092] In some embodiments, both the first part and the second part include multi-turn coil disks 121 connected in series, and the number of turns in the first part is less than the number of turns in the second part. This is to make the number of turns of the coil disks 121 connected in series in the first part different from the number of turns of the coil disks 121 connected in series in the second part, so as to facilitate the use of the first part and the second part to change the magnetic flux of the motor 1000 and ensure the working performance of the motor 1000.

[0093] In some embodiments, a switch can be provided for each turn of the coil disk 121. By controlling the on / off state of the coil disk 121, the number of turns of the coil disk 121 can be controlled, thereby changing the magnetic flux of the motor 1000 and reducing the difficulty of changing the magnetic flux of the motor 1000.

[0094] Among them, the switching on and off of the switching components can be controlled according to the set program.

[0095] In some embodiments, the first portion of the coil disk 121 has one turn, and the second portion of the coil disk 121 connected in series has multiple turns, so that the number of turns of the first portion of the coil disk 121 and the number of turns of the second portion of the coil disk 121 connected in series are different, so as to change the magnetic flux of the motor 1000.

[0096] With the above settings, when a higher speed is required for motor 1000, the control module 200 can be used to control the power supply to the first part, for example: controlling... Figure 6Na1 / Nb1 / Nc1 in the first part is powered on to reduce the number of turns of the stator winding 120 to reduce the magnetic flux, increase the no-load speed of the motor 1000, and thus ensure that the motor 1000 can output high speed; when the motor 1000 needs to obtain low-speed large torque, the second part can be controlled to be powered on by the control module 200, for example: controlling Figure 6 (Na1+Na2+…+Nak) / (Nb1+Nb2+…+Nbk) / (Nc1+Nc2+…+Nck) in the first part is powered on, which can increase the number of turns of the stator winding 120, and thus increase the magnetic flux of the motor 1000, increase the torque of the motor 1000, and reduce the no-load speed, to ensure the working performance of the motor 1000.

[0097] It is worth noting that through the above setting, the motor 1000 can be compatible with high and low speed operation without increasing the volume of the motor 1000 and without increasing the working noise of the motor 1000, thereby reducing the volume of the motor 1000 while ensuring the performance of the motor 1000, and reducing the manufacturing cost of the motor 1000.

[0098] In some embodiments, as shown in Figure 6 , the on-off state of each turn of the coil disc 121 can be adjusted by setting a segmented tap winding, reducing the adjustment difficulty, so that the motor 1000 can be compatible with high and low speed operation.

[0099] In some embodiments, the number of turns of the coil disc 121 of each phase stator winding 120 is k, and 2≤k≤5. When the number of turns k is large, the number of taps will be large, so that more cross wires and lead wires are needed when the coil disc 121 is wired, and the external switching control circuit also needs more paths, resulting in a complex structure of the motor 1000, and also affecting the production efficiency and system cost of the motor 1000.

[0100] Therefore, the number of turns k of the coil disc 121 of each phase stator winding 120 is set to satisfy 2≤k≤5, which not only ensures that each phase stator winding 120 includes multiple turns of coil discs 121, but also simplifies the structure of the motor 1000, improves the production efficiency of the motor 1000 to some extent, and is conducive to reducing the manufacturing cost of the motor 1000.

[0101] In a specific example, the number of turns k of the coil disc 121 of each phase stator winding 120 is 2, 3, 4, or 5.

[0102] In some embodiments, as shown in Figure 7 and Figure 8 , the multiple turns of the coil disc 121 of each phase stator winding 120 are connected in parallel. The parallel connection facilitates the improvement of overcurrent capacity, thereby ensuring the working performance of the motor 1000, so that the motor 1000 can obtain low-speed large torque.

[0103] In some embodiments, each phase stator winding 120 comprises a third part and a fourth part, the third part comprises a plurality of turns of coil disc 121, and the fourth part comprises at least one turn of coil disc 121, the number of turns of the fourth part is less than the number of turns of the third part, and the control module 200 controls the third part or the fourth part to be energized to change the flux linkage of the motor 1000. Here, it is referred to that the fourth part can comprise one turn of coil disc 121 or a plurality of turns of coil disc 121, when the fourth part comprises a plurality of turns of coil disc 121, the plurality of turns of coil disc 121 of the fourth part are connected in parallel, the plurality of turns of coil disc 121 of the third part are connected in parallel, and the number of turns of the plurality of turns of coil disc 121 connected in parallel of the fourth part of each phase stator winding 120 is less than the number of turns of the plurality of turns of coil disc 121 connected in parallel of the third part of each phase stator winding 120, so that the number of turns of the coil disc 121 connected in parallel of the third part and the number of turns of the coil disc 121 connected in parallel of the fourth part are different, so that when the control module 200 controls the third part or the fourth part to be energized, the motor 1000 can output high speed and low speed and large torque respectively, and the output performance is ensured, and the working performance of the motor 1000 is ensured.

[0104] In some embodiments, the fourth part is a single-turn coil disc 121. That is, it is not limited to changing the flux linkage of the motor 1000 by controlling the number of turns of the coil disc 121 connected in series, but also can control the plurality of turns of coil disc 121 connected in parallel to be energized or control the single-turn coil disc 121 to be energized respectively to change the flux linkage of the motor 1000, so that the motor 1000 can output high speed and low speed and large torque respectively, and the output performance is ensured, and the working performance of the motor 1000 is ensured.

[0105] In some embodiments, as shown in Figure 7 , each phase stator winding 120 comprises a plurality of turns of coil disc 121, when the motor 1000 needs to obtain low speed and large torque, the control module 200 controls the third part to be energized to realize that the plurality of turns of coil disc 121 of the same phase are connected in parallel, for example, controls Na1||Na2||Na3 in Figure 8 to be energized, and the plurality of turns of coil disc 121 connected in parallel can improve the overcurrent capacity, so as to ensure the working performance of the motor 1000; when the motor 1000 needs to obtain high speed, the control module 200 controls the fourth part to be energized to realize that the single-turn coil disc 121 is energized, for example, controls Na1 / Nb1 / Nc1, Na2 / Nb2 / Nc2 or Na3 / Nb3 / Nc3 in Figure 9 to be energized, the number of turns of the stator winding 120 is reduced, so as to realize the reduction of the flux linkage, improve the no-load speed of the motor 1000, and make the motor 1000 be able to effectively output high speed, so as to ensure the performance of the motor 1000.

[0106] Of course, in other embodiments, the fourth part can also include two-turn coil disc 121, which can also reduce the number of turns of the stator winding 120 to some extent, thereby reducing the magnetic flux and increasing the no-load speed of the motor 1000.

[0107] In some embodiments, as shown in Figure 10 , Figure 11 and Figure 12 , a part of the coil disc 121 in each phase stator winding 120 is connected in series and another part of the coil disc 121 is connected in parallel. Among them, when a part of the coil disc 121 is connected in series, the magnetic flux of the motor 1000 can be increased to improve the torque and reduce the no-load speed, so that the motor 1000 can output low-speed large torque; when a part of the coil disc 121 is connected in parallel, that is, a smaller part of the coil disc 121 is connected in parallel, the magnetic flux of the motor 1000 can be reduced to increase the no-load speed of the motor 1000, so that the motor 1000 can output high speed, and thus the motor 1000 can be compatible with high and low speed to ensure the working performance of the motor 1000.

[0108] In summary, the motor 1000 can be compatible with high and low speed by connecting a part of the coil disc 121 in each phase stator winding 120 in series and another part of the coil disc 121 in parallel.

[0109] In some embodiments, each phase stator winding 120 includes a fifth part and a sixth part, the multiple-turn coil disc 121 in the fifth part is connected in parallel, and the multiple-turn coil disc 121 in the sixth part is connected in series, and the control module 200 controls the fifth part or the sixth part to be energized to change the magnetic flux of the motor 1000. That is, the multiple-turn coil disc 121 in parallel and the multiple-turn coil disc 121 in series can also be controlled respectively to change the magnetic flux of the motor 1000, so that the motor 1000 can output high speed and low-speed large torque respectively, and ensure the output performance, and thus ensure the working performance of the motor 1000.

[0110] In the description of the utility model, the features limited by "first", "second", "third", "fourth", "fifth", "sixth" can be explicitly or implicitly include one or more of the features, for distinguishing the description features, there is no order, no difference between heavy and light.

[0111] In some embodiments, as shown in Figure 10 , Figure 11 and Figure 12 , the multiple-turn coil disc 121 in each phase stator winding 120 is connected in series when the motor 1000 needs to obtain low-speed large torque, and the control module 200 is used to control the sixth part to be energized to realize the connection of the multiple-turn coil disc 121 in the same phase in series, for example: Figure 12(Na1+Na2+Na3) / (Nb1+Nb2+Nb3) / (Nc1+Nc2+Nc3) energization, so as to increase the number of turns of the stator winding 120, and further improve the flux of the motor 1000, so as to improve the torque of the motor 1000 and reduce the no-load speed; when the motor 1000 needs to obtain high speed, the fifth part is energized by the control module 200 to realize parallel connection of a smaller part of the coil disc 121, for example, control Figure 11 (Na1∥Na2) / (Nb1∥Nb2) / (Nc1∥Nc2) energization, so as to reduce the flux of the motor 1000, improve the no-load speed of the motor 1000, and enable the motor 1000 to effectively output high speed, so as to ensure the performance of the motor 1000.

[0112] Of course, in some other embodiments, the fifth part can also be set to include a single-turn coil disc 121, and the fifth part is energized by the control module 200 to realize energization of the single-turn coil disc 121, for example: Na1 / Nb1 / Nc1, so as to reduce the number of turns of the stator winding 120, so as to reduce the flux, improve the no-load speed of the motor 1000, and enable the motor 1000 to effectively output high speed, so as to ensure the performance of the motor 1000.

[0113] It should be noted that the no-load speed formula of the motor 1000 is: n0=(Um / Ψf)*(60 / (2*π*p)), where Ψf=N*φ is the flux, i.e. n0=(Um / (N*φ))*(60 / (2*π*p)); the electromagnetic torque formula of the motor 1000 is: Tem=1.5*p*Ψf*Im=1.5*p*N*φ*Im; where Um is the bus voltage; n0 is the load speed.

[0114] In order to make the motor 1000 meet the performance requirements of low-speed large torque and high speed at the same time, the above three technical solutions are set in the present application:

[0115] Firstly, the total number of conductors N of the stator winding 120 is designed as k groups of coil discs 121 in series with intermediate taps (for example, as shown in FIG. 2a). Figure 6), such as: N=N1+N2+…+Nk, when the motor 1000 needs different speed and torque, the effective stator winding 120 can be adjusted by tapping to adjust the number of turns, when the motor 1000 needs to work at high speed or medium speed, the first part is controlled to be energized by the control module 200, so that N=N1 or N=N1+N2, the number of turns of the stator winding 120 is reduced, the flux linkage Ψf is reduced, and the speed of the motor 1000 is increased; when the motor 1000 needs low speed and large torque, the second part is controlled to be energized by the control module 200, so that N=N1+N2+…+Nk, the flux linkage Ψf is increased by increasing N, thereby improving the torque of the motor 1000, and reducing the no-load speed of the motor 1000.

[0116] Secondly, each phase stator winding 120 is provided with a third part and a fourth part, the third part includes a plurality of turns of coil disc 121 connected in parallel, and the fourth part is a single-turn coil disc 121, when the motor 1000 needs to obtain greater torque, the third part is controlled to be energized by the control module 200, so that the same phase plurality of turns of coil disc 121 are connected in parallel, such as: Na1∥Na2∥Na3, the plurality of turns of coil disc 121 connected in parallel can improve the overcurrent capability; when the motor 1000 needs to obtain high speed, the fourth part is controlled to be energized by the control module 200, so as to reduce the number of turns of the stator winding 120, thereby reducing the flux linkage and improving the no-load speed of the motor 1000, so that the motor 1000 can effectively output high speed, to ensure the performance of the motor 1000.

[0117] Thirdly, each phase stator winding 120 is provided with a fifth part and a sixth part, the plurality of turns of coil disc 121 in the fifth part are connected in parallel, and the plurality of turns of coil disc 121 in the sixth part are connected in series, when the motor 1000 needs to obtain low speed and large torque, the sixth part is controlled to be energized by the control module 200, so that the same phase plurality of turns of coil disc 121 are connected in series, such as: (Na1+Na2+Na3) / (Nb1+Nb2+Nb3) / (Nc1+Nc2+Nc3), which can increase the number of turns of the stator winding 120, thereby improving the flux linkage of the motor 1000, and improving the torque and reducing the no-load speed of the motor 1000; when the motor 1000 needs to obtain high speed, the fifth part is controlled to be energized by the control module 200, so as to realize the parallel connection of the plurality of turns of coil disc 121, such as: (Na1∥Na2) / (Nb1∥Nb2) / (Nc1∥Nc2); or, to realize the energization of the single-turn coil disc 121, such as: Na1 / Nb1 / Nc1, thereby reducing the flux linkage and improving the no-load speed of the motor 1000, so that the motor 1000 can effectively output high speed, to ensure the performance of the motor 1000.

[0118] To sum up, the motor 1000 can realize high-efficiency operation in each rotating speed interval by adjusting the magnetic chain, so as to expand the speed regulating range of the motor 1000 and improve the low-speed torque of the motor 1000.

[0119] The cooking equipment of the embodiment of the utility model is described below.

[0120] The cooking equipment according to the embodiment of the utility model comprises a motor 1000 and a stirring piece.

[0121] The motor 1000 is the aforementioned motor 1000, and the specific structure of the motor 1000 is not described here again. The stirring piece is connected with the motor shaft 320 of the motor 1000, and the motor shaft 320 rotates synchronously with the mover assembly 300. In this way, the motor 1000 can be used to drive the stirring piece to rotate, so as to process the food to be processed by using the stirring piece.

[0122] In some embodiments, the motor shaft 320 is fixedly connected with the mover assembly 300, so as to realize that the motor shaft 320 is driven to rotate by the mover assembly 300, reduce the rotating difficulty of the motor shaft 320, and then facilitate the motor shaft 320 to drive the stirring piece to rotate, so as to ensure the working performance of the motor 1000.

[0123] In some embodiments, the stirring piece is detachably connected with the motor shaft 320 of the motor 1000. While the stirring piece is arranged on the motor shaft 320 of the motor 1000, the stirring piece can also be removed, so as to facilitate the replacement of the stirring piece and reduce the replacement difficulty of the stirring piece.

[0124] As can be seen from the above structure, the cooking equipment of the embodiment of the utility model adopts the aforementioned motor 1000 to ensure the working performance of the cooking equipment and avoid increasing the size, cost and working noise of the cooking equipment to a certain extent, thereby improving the user experience.

[0125] In some embodiments, the cooking equipment can be provided with stirring pieces of multiple types. When the motor 1000 outputs different rotating speeds, different types of stirring pieces can be replaced according to the working condition of the cooking equipment, so as to ensure the working performance of the stirring piece and the working performance of the cooking equipment, thereby improving the user experience.

[0126] In some embodiments, the cooking device is a chef machine or a dough mixer. When the cooking device is a chef machine, the cooking device is formed as a multifunctional food processor which can not only stir food materials at high speed, but also cook or knead dough at low speed. When the cooking device is a dough mixer, the cooking device is mainly used for kneading dough. Thus, when the cooking device adopts the motor 1000, the multifunctional food processor can output high-speed rotating force when stirring food materials at high speed, and the multifunctional food processor can also output low-speed torque when cooking at low speed, so that the cooking device can output different rotating speeds, which not only enriches the functions of the cooking device, but also guarantees the working performance of the cooking device, thereby improving the user experience.

[0127] In some embodiments, as shown in FIG. 1, the motor 1000 further comprises a support bearing 600, and the two axial ends of the motor shaft 320 are respectively connected to the first end cover 400 and the second end cover 500 through the support bearing 600, so that the motor shaft 320 can be effectively rotated to guarantee the working performance of the motor shaft 320 and facilitate the rotation of the stirring member driven by the motor shaft 320. Figure 1

[0128] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0129] The motor 1000 for the cooking device and other configurations of the cooking device according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0130] In the description of the present application, the description of the terms "embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0131] ​Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An electric motor for a cooking appliance, characterized in that, The motor is configured to have multiple rotating speeds, and the motor comprises: a stator assembly comprising a stator core and a stator winding, the stator core being provided with a plurality of stator slots, the stator winding being wound around the plurality of stator slots; a rotor assembly comprising a plurality of permanent magnets coupled with the stator winding, the number of slots of the stator slots being m, the number of pole pairs of the rotor assembly being p, the motor satisfying 12≤m≤24 and 10≤2p≤20.

2. The electric motor for a cooking apparatus according to claim 1, characterized by, The motor has a stator slot ratio of α, and the motor satisfies 0.5<α≤0.

7.

3. The electric motor for cooking equipment according to claim 1, characterized in that, The torque density of the electric machine is 15 mN.m / cm 3 - 17 mN.m / cm 3 .

4. The electric motor for cooking equipment according to claim 1, characterized in that, The motor has a rotating speed n≤500r / min and a torque T≥2.5N.m.

5. The electric motor for cooking equipment according to claim 1, characterized in that, The motor is a brushless direct current motor, and a motor shaft of the brushless direct current motor is connected with the stirring piece.

6. The electric motor for cooking equipment according to any one of claims 1-5, characterized in that, The stator assembly comprises a plurality of phase stator windings, and each phase stator winding comprises a plurality of turns of coil discs; the motor further comprises: a control module electrically connected with the plurality of phase stator windings to control the on-off state of each turn of the coil discs, and the motor is configured to change the flux linkage of the motor by changing the number of turns used by the stator winding.

7. The electric machine of claim 6, wherein, Each phase stator winding comprises a first part and a second part, the first part comprises at least one turn of the coil discs, and the second part comprises a plurality of turns of the coil discs connected in series, the number of turns of the first part being less than the number of turns of the second part, and the control module controls the first part or the second part to be energized to change the flux linkage of the motor.

8. The electric machine of claim 6, wherein, The plurality of turns of the coil discs of each phase stator winding are connected in parallel.

9. The electric machine of claim 8, wherein, Each phase stator winding comprises a third part and a fourth part, the third part comprises a plurality of turns of the coil discs, and the fourth part comprises at least one turn of the coil discs, the number of turns of the fourth part being less than the number of turns of the third part, and the control module controls the third part or the fourth part to be energized to change the flux linkage of the motor.

10. The electric machine of claim 6, wherein, A part of the coil discs of each phase stator winding are connected in series, and another part of the coil discs are connected in parallel.

11. The electric machine of claim 10, wherein, Each phase stator winding comprises a fifth part and a sixth part, the plurality of turns of the coil discs in the fifth part are connected in parallel, and the plurality of turns of the coil discs in the sixth part are connected in series, and the control module controls the fifth part or the sixth part to be energized to change the flux linkage of the motor.

12. A cooking apparatus, characterized by, The motor is a motor according to any one of claims 1-11; The stirring piece is connected with a motor shaft of the motor, and the motor shaft rotates synchronously with the rotor assembly. The cooking device is a chef machine or a dough kneader.

13. The cooking apparatus according to claim 12, characterized in that, ​

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