WO2022222826A1

WO2022222826A1 - Electric motor and food processor

Info

Publication number: WO2022222826A1
Application number: PCT/CN2022/086631
Authority: WO
Inventors: 李越; 周垂有; 苏圣桐; 周强; 王球保; 蒋海波
Original assignee: 广东德昌电机有限公司
Priority date: 2021-04-23
Filing date: 2022-04-13
Publication date: 2022-10-27
Also published as: CN215452756U; DE202021102522U1

Abstract

Disclosed are an electric motor and a food processor using the electric motor. The electric motor is a three-phase electric motor, comprising a stator assembly and a rotor assembly rotating relative to the stator assembly, the stator assembly comprising a stator core and a coil wound around the stator core. The rotor assembly comprises a rotating shaft, a rotor core sleeved on the rotating shaft, and several permanent magnets inserted into the rotor core. The rotor core is formed with several insertion grooves, each insertion groove extends along the radial direction of the rotor core, and the several permanent magnets are inserted into the insertion grooves and are radially distributed around the rotating shaft. According to the food processor of the present invention, a three-phase brushless direct current electric motor is used as a driving force, the defects of large torque ripples and large vibrations and noises when the rotation of a switched reluctance electric motor can be effectively improved, strict requirements of people for increases in noise can be met, and the food processor is overall compact in structure, has a controllable size and stable operations, and is highly efficient.

Description

Motors and Food Processors

technical field

The present invention relates to the field of motors, in particular to a motor of a food processor.

Background technique

As the most common power source, motors are widely used in all walks of life, such as food processors such as soymilk machines, cooking machines, etc., to assist users in processing food and improving their lives. Industrial fans, blowers and pumps, machine tools, home appliances, power tools, vehicles and medical compressors.

Most of the drive motors of existing food processors use switched reluctance motors, which have the advantages of simple structure and high reliability. However, due to the salient pole structure of switched reluctance motors, when the rotor rotates, especially when rotating at low speed, there is a possibility of rotation. The shortcomings of large torque pulsation and large vibration noise cannot meet today's requirements for low environmental noise.

technical problem

In view of this, it is necessary to provide a motor with small torque ripple and low noise and application equipment such as a food processor or a compressor using the motor.

technical solutions

The invention provides a motor, which is a three-phase motor, comprising a stator assembly and a rotor assembly rotating relative to the stator assembly, the stator assembly including a stator iron core and a coil wound on the stator iron core; The rotor assembly includes a rotating shaft, a rotor iron core sleeved on the rotating shaft, and a plurality of permanent magnets inserted into the rotor iron core, the rotor iron core is formed with a plurality of insertion slots, each insertion slot Extending along the radial direction of the rotor core, the permanent magnets are inserted into the insertion slots and distributed radially around the rotating shaft.

Further, the outer diameter of the stator core of the motor is 100~150mm, the number of magnetic poles of the rotor assembly is 8, 10, 12, 14 or 16, and the permanent magnet is a magnetic energy product ranging from 3.8~4.9MGOe, Ferrites with a remanence range of 3900~4400Gs and a coercivity range of 250~320kA/m.

Further, the side end of the rotating shaft is connected with an induction magnetic block matched with the Hall element through a collar, one end of the collar is in interference fit with the side end of the rotating shaft, and the other end is in an interference fit with the induction magnetic block. interference fit, or the induction magnetic block is bonded to the other end of the collar.

Further, the rotor core is provided with a through slot at the central position of the two adjacent permanent magnets, and the through slots between each adjacent two permanent magnets are two and have different shapes.

Further, the cross section of one of the through slots is square and its length direction follows the circumferential direction of the rotor core, and the cross section of the other through slot is racetrack-shaped and its length direction extends along the rotor core. radial.

Further, the through-slot with a square cross-section is arranged on the radially outer side of the through-slot with a racetrack-shaped cross-section, and the cross-sectional area of the through-slot with a square cross-section is smaller than that of the racetrack-shaped through-slot. The cross-sectional area of the channel.

Further, the rotor further includes a plastic frame integrally covering the rotor iron core and the permanent magnet, and a plurality of balance holes are arranged at the outer edges of the axial side ends of the plastic frame for inserting balance pins to the said plastic frame. The rotor is balanced.

Further, a thermal protector for sensing the temperature of the coil is also included.

Further, it also includes a casing for accommodating the stator assembly and the rotor assembly, the casing includes a casing and an inner end cover covered on the casing, and a first bearing seat is formed in the center of the casing, concave in the center, A second bearing seat is formed in the center of the inner end cover, a bearing is respectively arranged in the first bearing seat and the second bearing seat to support the rotating shaft, and one end of the rotating shaft passes through the housing and is connected with a driving member. connect.

Further, a plurality of lugs are formed on the outer wall surfaces of the casing and the inner end cover, and the lugs are provided with through holes for fixing the casing and the inner end cover through screws; the lugs The outer sleeve is provided with an elastic protective sleeve, and the protective sleeve is provided with avoidance holes corresponding to the screws.

The present invention also provides a food processor, comprising the above-mentioned motor.

Further, the motor further includes a control assembly, the control assembly includes a power processing module and a motor drive module, the power processing module includes an EMI module and an AC-DC conversion module, and the motor drive module includes a DC-DC conversion module , motor MCU and inverter, the DC-DC conversion module is connected between the AC-DC conversion module and the motor MCU, the input end of the inverter is respectively connected with the AC-DC conversion module and the motor MCU The connection and output end are connected with the coil of the motor, and the motor MCU is connected with the main control circuit board of the food processor.

Further, the motor further includes a housing for accommodating the stator and the rotor, and a motor circuit board disposed in the housing, the motor circuit board is electrically connected to the coil of the stator, the power processing module and the motor The drive modules are all located in the housing of the motor and arranged on the motor circuit board; or, the motor drive module is located in the housing of the motor and arranged on the motor circuit board, and the power processing module is located in the motor circuit board. The outer casing of the motor is arranged on the main control circuit board; alternatively, the power processing module and the motor driving module are both located outside the outer casing of the electric motor and arranged on the main control circuit board.

beneficial effect

Compared with the prior art, the food processor of the present invention adopts a three-phase brushless DC motor as a drive, which can effectively improve the shortcomings of large torque ripple and large vibration noise when the switched reluctance motor rotates, and satisfies people's increasingly stringent noise requirements. requirements, the overall structure is compact, the size is controllable, the operation is stable and efficient.

Description of drawings

FIG. 1 is a schematic diagram of an embodiment of the motor of the food processor of the present invention.

FIG. 2 is a cross-sectional view of the motor shown in FIG. 1 .

FIG. 3 is another perspective view of the motor shown in FIG. 1 .

FIG. 4 is an exploded view of FIG. 3 .

FIG. 5 is another perspective view of FIG. 4 .

FIG. 6 is a further exploded view of the rotor assembly of the electric machine of FIG. 4 .

FIG. 7 is a further exploded view of the stator assembly of the electric machine of FIG. 5 .

8 is a circuit block diagram of the first embodiment of the food processor of the present invention.

FIG. 9 is a circuit block diagram of a second embodiment of the food processor of the present invention.

10 is a circuit block diagram of a third embodiment of the food processor of the present invention.

Embodiments of the present invention

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings. One or more embodiments of the present invention are exemplarily presented in the accompanying drawings, so as to make the understanding of the technical solutions disclosed in the present invention more accurate and thorough. It should be understood, however, that the present invention may be embodied in many different forms and is not limited to the embodiments described below.

The same or similar numbers in the drawings of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and Therefore, the terms describing the positional relationship in the drawings are only used for exemplary illustration, and should not be construed as a limitation on the present patent. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

The present invention provides a motor 100, which can be applied to a compressor, a food processor such as a blender, a mixer, a juicer, a soymilk maker, a food processor, and the like. As shown in FIGS. 1-5 , a motor 100 according to an embodiment of the present invention includes a casing 10 , and a rotor assembly 20 , a stator assembly 30 , and a control assembly 40 disposed in the casing 10 .

The housing 10 has a cylindrical structure as a whole, and includes a housing 12 , an inner end cover 14 and an outer end cover 16 . The casing 12 is a cylindrical structure with one end open, the inner end cover 14 is a disc-shaped structure, and the inner end cover 14 covers the open end of the casing 12 and forms a first installation space 13 for assembling the stator. Assembly 30 and rotor assembly 20 . The outer end cover 16 has a cylindrical structure with one end open, and its open end is assembled with the inner end cover 14 to form a second installation space 15 for assembling the control assembly 40 . The axial height of the housing 12 is much larger than the axial height of the outer end cover 16 , and the size of the first installation space 13 is much larger than that of the second installation space 15 . In the illustrated embodiment, a plurality of lugs 18 are formed on the outer walls of the housing 12 , the inner end cover 14 and the outer end cover 16 , and corresponding fixing holes 180 are formed on the lugs 18 . During assembly, screws and rivets can be used. The fixing member passes through the fixing hole 180 to fix and connect the housing 12 , the inner end cover 14 and the outer end cover 16 as a whole.

Preferably, the lugs 18 are covered with a protective cover 19, and the protective cover 19 is preferably made of elastic materials such as rubber, resin, etc., and has a certain elastic shock absorption effect and good wear resistance. Correspondingly, avoidance holes 190 are provided in the protective sleeve 19 for accommodating the ends of screws, rivets and the like. When assembling the motor 100 into the food processor, the motor 100 can be snapped into the notch of the corresponding mounting part of the food processor through the protective cover 19 . It is fixed in the food processor to ensure the stability of the motor 100 during operation and reduce the generation of noise. It should be understood that the assembly of the motor 100 and the food processor is not limited to an interference fit, and may also be snap-fit, screw-fit, riveting, welding, etc., which is not limited to this specific embodiment.

Please refer to FIG. 6 and FIG. 7 at the same time, the motor 100 of the present invention has an inner rotor structure, and the rotor assembly 20 is rotatably disposed in the center of the stator assembly 30 .

As shown in FIGS. 4 and 6 , the rotor assembly 20 is an embedded permanent magnet (IPM) structure, including a rotating shaft 22 , a rotor iron core 24 arranged around the rotating shaft 22 , and a plurality of permanent magnets 26 inserted into the rotor iron core 24 . And the plastic frame 28. Both the front and rear ends of the rotating shaft 22 protrude out of the rotor core 24, and the front end thereof passes through the housing 12 and is drivingly connected to a driving member 50 for driving a load connected to the driving member 50, such as a knife of a food processor, Rotate the stirring head etc. The end surface of the rear end of the rotating shaft 22 is provided with an induction magnetic block 29. The induction magnetic block 29 is in the shape of a flat cylinder and is fixedly connected to the rotating shaft 22 through a collar 60. One end of the collar 60 is sleeved with the rotating shaft 22 to form an interference fit, The other end is sleeved with the induction magnetic block 29 to form an interference fit. In other embodiments, the induction magnetic block 29 may also be bonded to the collar 60 and the end of the rotating shaft. After assembly, the Hall sensor 49 of the control assembly 40 can accurately detect the position of the rotor assembly 20 by sensing the magnet block 29 disposed at the side end of the rotating shaft 22 to control the operation of the motor 100 .

Referring to FIG. 2 together, a first bearing seat 120 is formed in the center of the housing 12 , and a second bearing seat 140 is formed in the center of the inner end cover 14 . A bearing 62 is provided in the first bearing seat 120 and the second bearing seat 140 respectively. The bearing 62 can be a ball bearing, a sliding bearing, a ceramic bearing, etc., and is respectively sleeved on the front and rear ends of the rotating shaft 22 to support the rotation of the rotor assembly 20. Reduce noise generation. In the illustrated embodiment, the center of the side end of the housing 12 is concave to a certain depth to reduce the height of the first bearing seat 120 protruding from the side end of the housing 12, thereby reducing the overall axial height of the motor 100, so that the motor 100 The structure is more compact and the volume is smaller. Preferably, the first bearing seat 120 is provided with a washer 122, and the washer 122 is preferably a corrugated meson, which is sandwiched between the first bearing seat 120 and the bearing 62 in the first bearing seat 120 in the axial direction to buffer the motor. 100 and the floating during load operation, reducing the noise generated by impacting the housing 10.

The rotor core 24 is formed by stacking a plurality of silicon steel sheets along the axial direction of the motor 100 , and has a circular cylindrical structure as a whole, and a through hole is formed in the center to pass through the rotating shaft 22 . A plurality of insertion slots 240 are formed on the rotor iron core 24 . The insertion slots 240 are radially distributed around the rotating shaft 22 , and each insertion slot 240 extends along the radial direction of the rotor iron core 24 . In the axial direction, the insertion slot 240 penetrates through the rotor iron core 24 ; in the radial direction, the insertion slot 240 does not penetrate through the inner and outer side surfaces of the rotor iron core 24 . The permanent magnet 26 is a flat plate, preferably a ferrite, with a maximum magnetic energy product range of 3.8-4.9 MGOe, a remanence range of 3900-4400 Gs, and a coercive force range of 250-320 kA/m. During assembly, the permanent magnets 26 are inserted into the corresponding insertion slots 240 of the rotor core 24 in the axial direction, and the centerline of the permanent magnets 26 is substantially coincident with the radial direction of the rotor core 24 .

Each permanent magnet 26 is arranged radially and polarized in the thickness direction (circumferential direction), and the facing surfaces of the two adjacent permanent magnets 26 have the same polarity, so that the rotor core 24 is located between the two permanent magnets 26. The partial polarization between them constitutes one magnetic pole of the rotor assembly 20 . Circumferentially, the rotor assembly 20 exhibits alternating N and S poles. The greater the number of magnetic poles of the rotor assembly 20, the higher the efficiency, but considering the overall size of the motor 100 and the difficulty of the manufacturing process, in the embodiment of the present invention, the number of magnetic poles of the rotor assembly 20 is set to 8, 10, 12, 14, 16, etc. In the illustrated embodiment, the number of permanent magnets 26 is 12, and the number of magnetic poles of the rotor assembly 20 is 12. In other embodiments, the permanent magnets 26 may also be arranged in the circumferential direction, and the shape of the permanent magnets 26 may be rectangular or tile-shaped, which is not limited to the specific embodiment.

Preferably, a through slot 242 is disposed in the center of each magnetic pole of the rotor core 24 to eliminate harmonic components and make the back electromotive force close to a sinusoidal curve, thereby improving the efficiency of the motor 100 . In addition, the arrangement of the through grooves 242 can also effectively reduce the weight of the rotor core 24 . In the illustrated embodiment, there are two through-slots 242 on each magnetic pole, wherein one through-slot 242a has a square cross-section, and the other through-slot 242b has a racetrack-shaped cross-section. The square through grooves 242a are located radially outside the racetrack-shaped through grooves 242b. The length direction of the square through slot 242a follows the circumferential direction of the rotor core 24, the length direction of the racetrack-shaped through slot 242b follows the radial direction of the rotor core 24, and the cross-sectional area of the square through slot 242a is smaller than that of the racetrack-shaped through slot 242b. area of the cross section. It should be understood that the number, size, shape, etc. of the through grooves 242 can be changed according to needs, and are not limited to the specific embodiment shown in the drawings.

The plastic frame 28 is an injection molded part, integrally covering the rotor core 24 and the permanent magnet 26 . In the manufacturing process, the rotating shaft 22, the rotor core 24 and the permanent magnet 26 can be pre-assembled and then placed in the injection mold, and then the plastic frame 28 can be injection-molded and the rotating shaft 22, the rotor core 24 and the permanent magnet 26 can be integrally connected, so that the The rotor assembly 20 is a non-detachable one-piece structure; or the rotor core 24 and the permanent magnets 26 can also be pre-assembled and placed in an injection mold, and the plastic frame 28 is injection-molded while integrally covering the rotor core 24 and the permanent magnets 26. Then, it is connected to the rotating shaft 22 by plugging. At this time, the rotating shaft 22 and the rotor core 24 can be an interference fit, or can be fixedly connected together by a key and a keyway, so as to realize the synchronous rotation of the rotor assembly 20 . Preferably, the plastic frame 28 is provided with a number of balance holes 280 at the outer edges of the two axial sides of the plastic frame 28. The balance holes 280 may be countersunk holes distributed along the circumference of the plastic frame 28 for inserting balance pins (Fig. Not shown) to balance, reduce the noise when the rotor assembly 20 rotates.

Please refer to FIG. 5 and FIG. 7 at the same time, the stator assembly 30 includes a stator iron core 32 , a wire frame 34 covering the stator iron core 32 , and a coil (not shown) wound on the wire frame 34 .

The stator core 32 is formed by stacking a plurality of silicon steel sheets, and includes an annular yoke 36 and a plurality of teeth 38 extending radially inward from the yoke 36 . The teeth 38 are evenly spaced in the circumferential direction, and together form an accommodating space 380 for accommodating the rotor assembly 20 . A tooth slot 382 is formed between adjacent tooth portions 38 , so that the coils can be wound on each tooth portion 38 in sequence. Preferably, the motor 100 of the present invention is a three-phase DC brushless motor, and the coils of the stator assembly 30 are divided into three phases, namely U-phase, V-phase and W-phase, and the phase difference between the coils of each phase is 120 degrees. Preferably, a thermal protector is also arranged near the coil, and when the temperature of the coil is higher than a predetermined temperature, the circuit is automatically cut off to prevent the motor 100 from being burned out by overheating.

The bobbin 34 is made of insulating plastic, and separates the teeth 38 of the stator core 32 from the coil, so as to avoid the coil being worn and short-circuited. Preferably, pins 39 are fixed on the wire rack 34, and the pins 39 pass through the inner end cover 14 to electrically connect the coil with the control assembly 40, so that the direction of the current flowing through the coil is periodically changed through the control assembly 40. , the coils form an alternating magnetic field and act on the magnetic field of the rotor assembly 20 to push the rotor assembly 20 to rotate. In the manufacturing process, the stator iron core 32 and the pins 39 can be placed in the injection mold first, then the wire frame 34 can be injection-molded and the stator iron core 32 and the pins 39 are integrally connected, and finally the coil is wound on the wire frame 34 and The ends of the coils are soldered to pins 39.

The magnetic field generated by the energization of the coil polarizes the stator core 32 , and each tooth 38 constitutes a magnetic pole of the stator core 32 . In the illustrated embodiment, the number of teeth 38 and coils is 18, correspondingly the number of tooth slots 382 is 18, the motor 100 as a whole has 12 poles and 18 slots, and the outer diameter of the stator core 32 is 100-150 mm. It can be understood that the number of teeth of the stator assembly 30 may also be other values.

As shown in FIGS. 4-5 and 8 , the control assembly 40 mainly includes a motor circuit board 42 , a power processing module 44 and a motor driving module 46 .

In the embodiment shown in FIG. 8 , the power processing module 44 and the motor driving module 46 are both disposed on the motor circuit board 42 , and the motor circuit board 42 is located in the second installation space 15 of the housing 10 of the motor 100 . The power processing module 44 includes an EMI module 442 and an AC-DC conversion module 444. The EMI module 442 is connected in series between the external power supply and the AC-DC conversion module 444, wherein the EMI module 442 is used for shielding electromagnetic interference, and the AC-DC conversion module 444 is used for for converting AC current to DC current. The motor driving module 46 includes a DC-DC module 462, a motor MCU 464 and an inverter 466, wherein the DC-DC module 462 is connected in series between the AC-DC conversion module 444 and the motor MCU 464, and reduces the voltage to supply power to the motor MCU 464; The input end of the inverter 466 is connected to the AC-DC conversion module 444 and the motor MCU 464 respectively, and the output end is connected to the motor 100 .

The motor driving module 46 can be connected to the main control circuit board of the food processor, and the main control circuit board is the control unit of the entire food processor and is disposed outside the housing 10 of the motor 100 . The main control circuit board communicates with the motor MCU 464 through cables or wirelessly, and the motor MCU 464 controls the operation of the motor 100 according to the instructions of the main control circuit board, such as starting, stopping, speed adjustment, forward rotation, reverse rotation, etc. of the motor 100 The main control circuit board also coordinates the operation of the entire equipment according to the feedback of the motor MCU 464.

2, 5 and 8 together, the motor circuit board 42 is arranged at intervals from the inner end cover 14, and the motor circuit board 42 is arranged with many electronic components, such as the side where the power processing module 44 and the motor drive module 46 are arranged facing outwards The end cap 16 ensures that the heat can be dissipated smoothly towards the outer end cap 16 . Preferably, the outer end cap 16 is made of a material with good thermal conductivity, such as aluminum or aluminum alloy. More preferably, a plurality of fins 160 are formed on the outer wall surface of the outer end cover 16 to increase the heat exchange area between the outer end cover 16 and the surrounding air, so that the heat of the control assembly 40 can be dissipated as quickly as possible through the outer end cover 16 . The Hall sensor 49 is disposed on the side of the motor circuit board 42 facing the inner end cover 14 and facing the induction magnet block 29 to accurately sense the position of the rotor assembly 20 and feed back the signal to the motor MCU 464 to control the operation of the motor 100 .

For the consideration of structural space and cost, in other embodiments, as shown in FIG. 9 , the motor drive module 46 may only be arranged in the housing 10 of the motor 100 , such as arranged on the motor circuit board 42 , and the power supply The processing module 44 is arranged outside the housing 10 of the motor 100, such as being arranged on the main control circuit board 70 of the food processor, etc., to reduce crosstalk; alternatively, as shown in FIG. 10, the power processing module 44 and the motor driving module can also be combined 46 are all disposed outside the housing 10 of the motor 100, such as all disposed on the main control circuit board 70 of the food processor. In practical applications, the installation position and connection method of each electronic component of the control assembly 40 can be determined according to the specific structure of the food processor. For example, electrical connection and communication between the electronic components can be realized through connectors and cables. Communication between electronic components can also be ensured wirelessly. In addition, in other embodiments, the DC-DC module 462 may also be placed in the power processing module 44 , such as integrated in the AD-DC conversion module 444 , rather than in the motor driving module 46 . The invention can also be applied to a variety of equipment such as industrial fans, blowers and pumps, machine tools, power tools, vehicles and medical compressors, among others.

The food processor of the present invention adopts a three-phase brushless DC motor as a drive, which can effectively improve the shortcomings of large torque ripple and large vibration and noise when the switched reluctance motor rotates, meet people's increasingly stringent requirements for noise, and has a compact structure as a whole. Controllable size, smooth operation and high efficiency. The motor of the present invention can also be used in other application equipment, such as compressors and the like.

It should be noted that the present invention is not limited to the above-mentioned embodiments. According to the inventive spirit of the present invention, those skilled in the art can also make other changes. These changes made according to the inventive spirit of the present invention should be included in the present invention. within the scope of the claimed invention.

Claims

A motor, which is a three-phase motor, includes a stator assembly and a rotor assembly that rotates relative to the stator assembly, wherein the stator assembly includes a stator iron core and a coil wound on the stator iron core ; The rotor assembly includes a rotating shaft, a rotor iron core sleeved on the rotating shaft, and a plurality of permanent magnets inserted into the rotor iron core, the rotor iron core is formed with a plurality of insertion slots, and each insertion slot is The slots extend along the radial direction of the rotor core, and the permanent magnets are inserted into the insertion slots and distributed radially around the rotating shaft.
The motor of claim 1, wherein the outer diameter of the stator iron core of the motor is 100-150 mm, the number of magnetic poles of the rotor assembly is 8, 10, 12, 14 or 16, the permanent magnet It is a ferrite with a magnetic energy product range of 3.8~4.9MGOe, a remanence range of 3900~4400Gs, and a coercive force range of 250~320kA/m.
The motor according to claim 1, wherein the side end of the rotating shaft is connected with an induction magnetic block matched with the Hall element through a collar, and one end of the collar is in interference with the side end of the rotating shaft The other end is in interference fit with the induction magnetic block, or the induction magnetic block is bonded to the other end of the collar.
The motor according to claim 1, wherein the rotor core is provided with a through slot at the center of the two adjacent permanent magnets, and the communication between each adjacent two permanent magnets The grooves are two and have different shapes.
The motor according to claim 4, wherein the cross section of one of the through grooves is square and its length direction is along the circumferential direction of the rotor core, and the cross section of the other through groove is racetrack-shaped And its length direction is along the radial direction of the rotor core.
6. The motor according to claim 5, wherein the through-slot with a square cross-section is disposed on the radially outer side of the through-slot with a racetrack-shaped cross-section, and the cross-section of the square through-slot is The cross-sectional area is smaller than the cross-sectional area of the racetrack-shaped channel.
The motor according to claim 1, wherein the rotor further comprises a plastic frame integrally covering the rotor iron core and the permanent magnet, and a plurality of balance holes are provided at the axial outer edge of the plastic frame, It is used for inserting the balance pin to balance the rotor.
The electric machine of claim 1, further comprising a thermal protector that senses the temperature of the coil.
The motor according to any one of claims 1 to 8, further comprising a casing for housing the stator assembly and the rotor assembly, the casing comprising a casing and an inner end cover disposed on the casing , the center of the housing is concave to form a first bearing seat, the center of the inner end cover forms a second bearing seat, and a bearing is respectively provided in the first bearing seat and the second bearing seat to support the rotating shaft, so One end of the rotating shaft passes through the casing and is connected with a driving member.
The motor according to claim 9, wherein a plurality of lugs are formed on the outer walls of the casing and the inner end cover, and through holes are provided on the lugs for screws to pass through the casing. It is fixed with the inner end cover; the lug outer sleeve is provided with an elastic protective sleeve, and the protective sleeve is provided with an escape hole corresponding to the screw.
A food processor, characterized by comprising the motor according to any one of claims 1-10.
The food processor of claim 11, further comprising a motor control assembly, the control assembly comprising a power processing module and a motor driving module, the power processing module comprising an EMI module and an AC-DC conversion module, the The motor drive module includes a DC-DC conversion module, a motor MCU and an inverter, the DC-DC conversion module is connected between the AC-DC conversion module and the motor MCU, and the input ends of the inverter are respectively connected to the inverter. The AC-DC conversion module is connected to the motor MCU, the output end is connected to the coil of the motor, and the motor MCU is connected to the main controller on the main control circuit board of the food processor.
The food processor according to claim 12, wherein the motor further comprises a housing for accommodating the stator and the rotor, and a motor circuit board disposed in the housing, the motor circuit board and the stator are in contact with each other. The coils are electrically connected, and the power processing module and the motor drive module are both located in the housing of the motor and arranged on the motor circuit board; or, the motor drive module is located in the housing of the motor and arranged on the motor circuit board. On the motor circuit board, the power processing module is located outside the casing of the motor; or, the power processing module and the motor driving module are located outside the casing of the motor and are arranged on the main control circuit board .