570results about "Synchronous machine details" patented technology

The invention provides a permanent magnet motor and a variable-frequency scroll compressor, and relates to the technical field of scroll compressor design and manufacturing, and the permanent magnet motor comprises a stator iron core and a rotor iron core; the stator iron core comprises stator slots which are uniformly distributed along the circumference, copper windings are embedded in the slots, stator yokes which are uniformly distributed are arranged outside the bottom of each slot, each stator yoke is provided with an arc-shaped long slot, stator teeth are arranged between every two adjacent stator slots, and the tops of the stator teeth are sunken to form through-flow slots; the rotor core is internally provided with magnetic steel grooves which are uniformly distributed, two same first magnetic isolation grooves are arranged between two adjacent magnetic steel grooves, magnetic steel is arranged in the magnetic steel grooves, and the top of each magnetic steel is provided with two second magnetic isolation grooves which are symmetrically distributed. The outer side radius Rs1 of the stator core, the inner side radius Rs2 of the stator core and the axial length Lis of the stator core meet the following conditions: 1.282 < = Lis / (Rs1-Rs2) < = 2.778, and 34 < = Rs1-Rs2 < = 39 mm. The power density of the motor can be increased, the cost is reduced, the efficiency is improved, and the harmonic content is reduced so as to suppress torque ripple.

The invention relates to the technical field of permanent magnet synchronous motors, in particular to a method, device and equipment for reducing vibration noise of a permanent magnet synchronous motor, and the method comprises the steps: building an electromagnetic field model, extracting radial electromagnetic force data, carrying out the spectrum and modal analysis, recognizing a main noise source, generating an acoustic power level waterfall plot through the combination of acoustic simulation, and defining an optimization target. The optimal scheme is finally obtained by designing the shape of a rotor hole, adjusting multi-parameter collaborative optimization of stator slot width and air gap length and the like, and iteratively optimizing key variables by adopting an intelligent algorithm. According to the method, the space 0-order quadruplicated frequency noise and 24-order octupled frequency noise are remarkably reduced, the torque fluctuation is inhibited, the output performance is ensured, the method is suitable for large-scale production, and the NVH quality of the motor is effectively improved.

The invention discloses a motor, a compressor and refrigeration equipment, and relates to the technical field of permanent magnet motors, stator teeth and stator slots on the inner circumference of a stator core are alternately distributed, windings are arranged in the stator slots, the number of the stator slots is Q, the diameter of the maximum outer circle contour of the stator core is D1, the diameter of the maximum circle contour defined by the slot bottoms of the plurality of stator slots is D2, the diameter of the minimum inner circle outline of the stator core is D3, the rotor is rotatably mounted in the stator, the number of pole pairs of the rotor is P, and GCD (Q, P) * (D1-D2) / 2) / ((D1-D3) / 2) is greater than or equal to 1.4 and less than or equal to 2.6, and ((D2-D3) / 2) / (D3 / 2) is greater than or equal to 0.3 and less than or equal to 0.42, and GCD (Q, P) is the largest common divisor of Q and P. The technical scheme provided by the invention aims at balancing the rigidity and temperature of the stator, and ensuring the low-noise operation of the motor and the operation reliability of the motor at the same time.

A structure of a rotor changeable of a magnetic force is provided, which includes a rotor core and a plurality of magnetic pole parts disposed therein. Each magnetic pole part includes a radially-magnetized fixed magnetic-force magnet and a circumferentially-magnetized variable magnetic-force magnet. A cavity part is disposed between the fixed magnetic-force magnet and the variable magnetic-force magnet. The cavity part has a cross-section extending from an end part of the fixed magnetic-force magnet toward an opposing surface. The cavity part is formed so that a distance between the variable magnetic-force magnet and the cavity part in the circumferential direction becomes larger as the cavity part approaches the opposing surface, and a width of the cavity part in the circumferential direction becomes smaller as the cavity part separates from the fixed magnetic-force magnet in the radial direction.

The invention discloses a low-vibration permanent magnet motor for harmonic directional suppression rotor modification and a design method thereof. The structure and size of the permanent magnet motor are determined; analyzing the electromagnetic performance of the motor, and determining the harmonic order and phase of the radial permanent magnetic flux density; analyzing the vibration characteristics of the motor, and determining the main vibration frequency of the motor and the radial force order of dominant vibration so as to determine the order of the radial permanent magnetic flux density needing to be reduced; analyzing the relationship between the air gap magnetic conductance and the magnetic flux density, and determining the order and phase to which the air gap magnetic conductance needs to be added according to the distribution of the radial permanent magnet magnetic flux density to be reduced; a compensation function is established by adding air gap magnetic conductance which is opposite to the radial permanent magnetic flux density needing to be reduced, and the shaping position and shape are determined according to the period and shape of the compensation function; and considering the torque performance and stress of the motor, and determining the shaping depth. By adopting the method provided by the invention, the specific radial permanent magnetic flux density harmonic wave can be directly reduced, the vibration response can be effectively inhibited, and the torque performance of the motor can be ensured to be unchanged.

The invention provides a permanent magnet synchronous driving assembly with a speed change function. The permanent magnet synchronous driving assembly comprises a hybrid excitation motor, a speed reducer, a dual-channel inverter, a controller and a sensing network, the hybrid excitation motor comprises a stator and a rotor which are provided with fractional slot windings, the rotor is sequentially provided with a permanent magnet array, an isolation layer and an excitation winding array which are sequentially distributed in the axial direction of the rotor from the axis to the outside, the permanent magnet array is formed by splicing a plurality of fan-shaped magnetic steel, and N poles and S poles are alternately arranged to form main magnetic field pole pairs; the number of excitation windings of the excitation winding array is half of that of the magnetic steel, each winding is embedded between adjacent pole pairs, and the axes of the excitation windings and the axes of the magnetic poles of the permanent magnets are deviated by a certain angle to form a space phase difference; a permanent magnet magnetic circuit formed by the permanent magnet array and the stator and an electric excitation magnetic circuit formed by the excitation winding array and the stator are subjected to vector superposition at an air gap; the dual-channel inverter comprises a main power channel and an excitation channel.

The invention discloses an energy-saving circulating water cooling structure of a permanent magnet motor, which belongs to the technical field of motors and comprises a casing, a front end cover for sealing is fixedly mounted at the front end of the casing, and a rear end cover for sealing is fixedly mounted at the rear end of the casing. A rotating shaft for rotation is rotatably mounted among the casing, the front end cover and the rear end cover in a penetrating manner, and a rotor iron core is fixedly mounted on the rotating shaft close to the interior of the casing; according to the energy-saving type circulating water cooling structure of the permanent magnet motor, when the turbine rotates, cooling liquid can be conveyed into the first spiral cooling groove and the second spiral cooling groove, and after the cooling liquid enters the first spiral cooling groove, the cooling liquid can spirally flow to the rear end of the machine shell from the front end of the machine shell for cooling; and after entering the second spiral cooling groove, the cooling liquid can spirally flow from the rear end of the casing to the front end of the casing for cooling, so that the cooling liquid can conveniently flow in opposite directions, the heat dissipation of the permanent magnet motor is more uniform, and the heat dissipation efficiency is improved.

The utility model discloses a motor, a compressor and refrigeration equipment, the motor comprises a stator, the stator comprises a stator iron core and a winding, the stator iron core is provided with a plurality of stator teeth, the winding is wound on the stator teeth, and a stator slot is defined between two adjacent stator teeth; the rotor is arranged in an inner cavity of the stator, the rotor comprises a rotor iron core and magnets, the rotor iron core is provided with a plurality of installation grooves, the installation grooves are arranged at intervals in the circumferential direction of the rotor iron core, the magnets are suitable for being installed in the installation grooves, the number of stator grooves is Q, the number of poles of the rotor is 2p, the phase number of the winding is m, the outer diameter of the stator is D1, the inner diameter of the stator is D2, and GCD (Q, G, D) is smaller than Q; 2p) is the largest common divisor of the number of the stator slots and the number of the poles of the rotor and satisfies Q / (2pm) lt; 1, 11.2 < = (D2 / D1) (GCD (Q, 2p)) 2 < = 16.5. According to the motor provided by the embodiment of the utility model, the power density of the motor can be improved and the vibration noise of the motor can be reduced by limiting the largest common divisor of the stator slots and the rotor poles and the inner and outer diameters of the stator.

The utility model discloses a motor, a compressor and refrigeration equipment. The motor comprises a stator; the rotor is arranged in an inner cavity of the stator, the rotor comprises a rotor iron core and magnets, the rotor iron core is provided with a plurality of magnet grooves, the magnet grooves are arranged at intervals in the circumferential direction of the rotor iron core, the magnets are suitable for being installed in the magnet grooves, the outer diameter of the rotor is D, and on the cross section perpendicular to the rotating axial direction of the rotor, D is larger than D; the minimum distance between each magnet and the rotation center of the rotor is L, the intrinsic coercive force of the magnets is Hcj, and the Hcj (L / D) / 1000 is larger than or equal to 0.975 kA / m and smaller than or equal to 1.71 kA / m, and the Hcj is smaller than or equal to 1800 kA / m. According to the motor provided by the embodiment of the utility model, the ratio of the minimum distance between each magnet and the rotation center of the rotor to the outer diameter of the rotor is defined as a demagnetization factor, and the relationship between the demagnetization factor and the intrinsic coercive force of the magnets is limited, so that the utilization rate of the magnets can be ensured, and the service life of the motor is prolonged on the basis of ensuring the demagnetization rate of the motor. The use of counterweight rare earth materials can be reduced, the cost of the magnet is reduced, and the cost performance of the motor is improved.

The invention provides a permanent magnet synchronous motor and a vehicle. The permanent magnet synchronous motor comprises a stator structure and a rotor structure, the rotor structure is sleeved with the stator structure, the stator structure comprises a stator iron core (1), the rotor structure comprises a rotor iron core (3), the stator iron core (1) comprises stator grooves (2), the stator grooves (2) comprise first stator grooves (21) and second stator grooves (22), and the first stator grooves (21) and the second stator grooves (22) are arranged in one pole. When the d-axis of the rotor structure coincides with the magnetic pole center line of the stator structure, the first stator grooves (21) are located on the two sides of the q-axis of the permanent magnet synchronous motor and are adjacent to the q-axis, the second stator grooves (22) are located between the two first stator grooves (21) on the two sides of the d-axis, the notch width of the first stator grooves (21) is B1, the notch width of the second stator grooves (22) is B0, and B1 is smaller than B0. According to the permanent magnet synchronous motor, the cogging torque of the motor and the torque pulsation of the motor can be reduced, the harmonic content of the motor is reduced, and the noise and vibration of the motor are reduced.

The application relates to the technical field of permanent magnet motors, and discloses a heat dissipation type permanent magnet motor which comprises a machine body, a cooling cover for heat dissipation of the permanent magnet motor is fixedly connected to the outside of the machine body, and a purification shell for processing flowing air is fixedly connected to the outside of the cooling cover. The heat generated by the machine body during operation can be directly conducted and dissipated to air through the heat conduction strip. The memory metal strip senses the emergency overheating of the machine body during operation, so that the bending plate moves to trigger the contact to complete the temperature sensing of the machine body. The pulp plate runs to guide the external air into the cooling channel inside the heat conduction strip to perform air cooling heat dissipation, so that the permanent magnet motor adopts the combination mode of the heat dissipation fin and the emergency air cooling heat dissipation, the heat dissipation effect of the permanent magnet motor is improved, the filter plate filters and removes dust in the flowing air, the screw rod moves to make the nozzle move to perform high-pressure air blowing on the dust filtered and gathered in the filter plate, and the air dust filtered by the air cooling heat dissipation of the permanent magnet motor is automatically cleaned.

A semi-direct drive permanent magnet synchronous motor for a pumping unit, the semi-direct drive permanent magnet synchronous motor comprising a housing, and a stator and a rotor arranged in the housing. The rotor comprises a rotor core, magnetic steel slots arranged on the rotor core, and magnetic steel arranged in the magnetic steel slots. A magnetic isolation bridge is arranged on the side of each magnetic steel slot close to an outer edge of the rotor core, and a hollow magnetic isolation part is arranged on the side of the magnetic steel slot close to the middle of the rotor core. A magnetic pole is arranged between each two adjacent magnetic steel slots, and the sides of the two pieces of magnetic steel located on two sides of the magnetic pole and facing the magnetic pole have a same polarity. Compared with the prior art, the present invention has the following advantages: each hollow magnetic isolation part is arranged on the side of the magnetic steel close to the middle of the rotor core, which effectively suppresses the flux leakage of the magnetic steel while achieving weight reduction of the rotor core and improving the energy conversion efficiency of the motor. The provision of a first reinforcing annular plate and a second reinforcing annular plate improves the mechanical strength of the rotor and compensates for the impairment to strength caused by the hollow magnetic isolation parts; moreover, the magnetic steel is lowered down to be covered therein, so that harm caused by the magnetic steel falling off is eliminated.

This invention discloses an internal water channel cooling system for a low-speed, high-torque permanent magnet synchronous motor rotor. The system includes an internal water channel cooling device, a bearing, and a waterproofing device. The internal water channel cooling device is fixed to the inner wall of the rotor and rotates at the same speed as the rotor. The inner ring of the bearing is connected to the inlet end of the internal water channel cooling device, and the outer ring of the bearing is connected to the outlet end of the external water channel. Coolant flows from the external water channel along the gap in the middle of the inner ring of the bearing to the internal water channel cooling device. The connection between the water channels at both ends of the bearing is sealed off by the waterproofing device. This invention sets up internal water channels inside the motor and extends the flow path of the coolant within the channels using baffles, increasing the coolant flow distance and thus improving the cooling effect. This solves the problem of temperature rise in the permanent magnet part, which has the greatest impact on the performance of the permanent magnet synchronous motor, thereby improving the performance of the permanent magnet synchronous motor.

A rotor has at least one first rotor body with a first group of permanent magnets and a second rotor body with a second group of permanent magnets. The first and the second rotor bodies are rotated relative to each other about a common rotational axis against the effect of a first torsional stiffness by a mechanical field-attenuation mechanism. The field-attenuation mechanism includes a lever element. The first rotor body is coupled to a first lever section, and the second rotor body is coupled to a second lever section of the lever element. The first and second lever sections are arranged on opposite sides of the lever such that by tilting the lever element, the first and the second rotor bodies are rotated relative to each other in a targeted manner to produce a desired adjustment of the mechanical field-attenuation mechanism.

The invention discloses a rotor and a synchronous reluctance motor with the same. In the invention, the rotor has an even number of magnetic barrier structures, each magnetic barrier structure comprises a plurality of arc-shaped magnetic barrier layers, the plurality of arc-shaped magnetic barrier layers of each magnetic barrier structure have the same symmetry axis, each arc-shaped magnetic barrier layer comprises five sections of magnetic barriers, two sections of outermost magnetic barriers are mutually symmetrical about the symmetry axis, and two sections of middle magnetic barriers are mutually symmetrical about the symmetry axis. A section of the innermost magnetic barrier is symmetrical about the symmetry axis, so that the reluctance torque of the motor can be fully utilized to improve the output performance of the motor by means of the design of the multiple layers of magnetic barriers with the same symmetry axis. In addition, the two outermost magnetic barriers are not filled with magnetic substances, so that the magnetic substances are far away from the stator winding to reduce the risk of demagnetization of the magnetic substances.

The invention relates to a rotor structure suitable for improving weak magnetic speed expansion capability of a disc type motor, a rotor core is embedded in a groove of a rotor support disc, composite magnetic poles are uniformly distributed and attached to the surface of the rotor core, a magnetic isolation support and the rotor support disc are fixed together, and the composite magnetic poles are embedded in mounting grooves of the magnetic isolation support. The composite magnetic poles are composed of permanent magnets, parallel magnetic poles and series magnetic poles, the series magnetic poles are attached to the surfaces of the permanent magnets in the axial direction to form series parts of the magnetic poles, the series parts of the parallel magnetic poles and the series parts of the magnetic poles are arranged in parallel in a one-to-one correspondence mode in the radial direction, and the series parts of the parallel magnetic poles and the series parts of the magnetic poles form parallel parts of the magnetic poles. Compared with a surface-mounted disc type motor, the direct-axis inductance of the motor is obviously improved; and compared with a disc type motor with parallel combined magnetic poles, the output power is higher in the same speed expansion range. When the motor is used for a disc type motor, the disc type motor has a wide flux-weakening speed regulation range, and the loading capacity of the motor at a low speed is improved.

A motor and a cleaner comprising the same. The motor comprises a stator including a stator core; a rotating shaft arrangeable inside the stator; a rotor rotatable about the rotating shaft by electromagnetically interacting with the stator while the rotating shaft is arranged inside the stator; a housing to accommodate the stator and the rotor; and a bearing coupleable to the housing such that while the bearing is coupled to the housing, the bearing allows the stator and the rotor to be stably coupled to each other. While the stator and the rotor are accommodated in the housing, a center of the stator core and a center of the rotor along an extension direction of the rotating shaft is arranged at different positions from each other with respect to the extension direction of the rotating shaft.

The invention provides a motor, a power system and a vehicle. The motor comprises: a stator core; the rotor iron core is rotatably arranged in the stator iron core, an air gap is enclosed between the outer peripheral wall of the rotor iron core and the inner peripheral wall of the stator iron core, the maximum value of the air gap is recorded as H1 from the rotor iron core to the stator iron core, and the minimum value of the air gap is recorded as H2; the rotor core is provided with a shaft hole and a plurality of magnetic pole parts, and the plurality of magnetic pole parts are arranged around the shaft hole at intervals; any one of the plurality of magnetic pole parts comprises a first magnetic slot group and a second magnetic slot group; an included angle formed by the first radial extension line and the second radial extension line is recorded as theta 1; an included angle formed by the third radial extension line and the fourth radial extension line is recorded as theta 2; wherein 0.12 < = (H1-H2) / (H1 + H2) < = 0.33, and 1.64 < = theta2 / theta1 < = 2.1.

The invention relates to a low-harmonic permanent magnet synchronous motor rotor punching sheet and a motor rotor, and relates to the technical field of permanent magnet synchronous motors. According to the scheme, the rotor punching sheet is provided with the first magnetic steel groove and the second magnetic steel groove which form a V shape and are symmetrical about the D axis of the motor rotor, and the opening of the V shape faces the outer circumferential wall of the rotor punching sheet body. According to the structure, the distribution of a motor rotor magnetic field is improved, the magnetic field is more uniform, the salient pole rate is higher, the weak magnetic speed expansion capability is stronger, the structural strength is better, the harmonic content is lower, and the sine property of the magnetic field can be improved. On the outer circumferential wall of the rotor punching sheet body, a first auxiliary groove is formed between the first magnetic isolation bridge and the second magnetic isolation bridge and close to the first magnetic isolation bridge, and a second auxiliary groove is formed between the second magnetic isolation bridge and the D shaft and close to the second magnetic isolation bridge. On the premise of ensuring the mechanical strength of the magnetic isolation bridge, the magnetic line direction is changed, the magnetic leakage is reduced, the air gap flux density waveform is improved, the harmonic content is reduced, and the torque ripple and electromagnetic noise are reduced.

A vehicle's electrified powertrain includes a battery pack linked to a traction power inverter module (TPIM) converting DC voltage from the battery pack into AC voltage. A rotary electric machine includes a stator energized by the TPIM's AC voltage, enclosing a rotor core capable of rotation. The rotor core contains slots holding conductive bars and permanent magnets, with conductive bars positioned closer to the rotor core's center. The conductive bars and permanent magnets are separated by gaps within each slot. An annular end ring assembly is present at one end of the rotor core, featuring terminal conductors connected to subsets of conductive bars and a secondary coil of a rotary transformer. When the stator is energized, the rotor shaft, connected to the rotor, rotates. The electric machine powers a transmission, which is coupled to the rotor shaft.

The invention discloses a multi-point composite cooling system for a high-torque-density permanent magnet synchronous motor, and relates to the technical field of motor cooling, on the basis of a spiral water channel of a casing, an annular water channel is additionally arranged on an end cover, radiating ribs are arranged on the inner wall of the end cover, and a water cooling plate is additionally arranged at the end part of a stator core. The water cooling plate and the shell spiral water channel share a cooling loop, and the end covers on the two sides adopt independent water channel design, so that the effect of a main cooling system is prevented from being influenced by flow resistance of the end covers. A casing spiral water channel serves as a main heat sink, and heat of a stator iron core and a winding linear part is absorbed through cooling liquid circulation; the end water cooling plate directly cools a magnetic field concentration area at the end of the stator, and the temperature rise at the end of the winding and the end of the stator is specifically inhibited; the independent water channel of the end cover realizes regional thermal isolation, thermal coupling with cooling liquid of the casing is avoided, a bearing / sealing component is cooled preferentially, and part of rotor heat is taken away through shafting conduction; and with the assistance of the surface area strengthening effect of the radiating ribs of the end cover, all-directional thermal management of key components of the motor is formed.

A dynamoelectric machine including an inner cylindrical stator, an outer cylindrical stator, and a cylindrical rotor positioned radially between the inner cylindrical stator and the outer cylindrical stator, the cylindrical rotor being rotatable with respect to the inner and outer cylindrical stators. The cylindrical rotor includes at least one rotating conductor which includes a mixture of an electrically conducting material and a ferromagnetic material. The inner and outer cylindrical stators include at least one of (i) gradient magnetic field strength areas that vary in flux density longitudinally down along an axial direction of the dynamoelectric machine, (ii) different radial diameters of overlapping rotor and stator portions provided at different axial positions of the dynamoelectric machine, and (iii) electromagnets which are structured to be selectively energized based on a changing variable.

The invention discloses a multi-magnetic field harmonic working permanent magnet vernier motor, belongs to the field of harmonic utilization or magnetic field modulation motors, and aims to solve the problems of insufficient utilization of a harmonic magnetic field and limited torque output capability of a permanent magnet vernier motor. The motor comprises an outer stator unit and an inner rotor unit which are coaxial, and a part clamped by the outer stator unit and the inner rotor unit is an air gap unit; the stator comprises a stator iron core, stator teeth of the stator iron core comprise axially symmetric stator yokes, stator main teeth, auxiliary teeth for editing magnetic conductance and stator split teeth, the stator main teeth and the two stator split teeth form a V-shaped structure facing an air gap unit, and the auxiliary teeth for editing magnetic conductance are arranged in the V-shaped structure. The air gap unit forms a magnetic conductance modulation structure through the interaction of the outer circle of the permanent magnet and the stator core, and air gap magnetic conductance used for modulating an armature magnetic field and a permanent magnet magnetic field is formed in an air gap. The auxiliary teeth for editing the magnetic conductance are used for adjusting the harmonic magnetic conductance component of the air gap magnetic conductance, and the output torque of the motor is improved by improving the magnetic conductance lower limit value at the symmetry axis of the stator teeth.

The invention relates to the technical field of synchronous motors, in particular to a low-voltage high-power high-efficiency permanent-magnet synchronous motor, which comprises a casing and an end cover fixedly mounted at one end of the casing, and further comprises a rotating shaft, a permanent-magnet motor and a permanent-magnet motor, the through hole is formed in the end cover; the filter plate is detachably mounted in the through hole, and a plurality of filter holes are formed in the filter plate; the multiple transverse plates are installed in the through holes from top to bottom in a linear array mode and located on one side of the filter plate, and intervals exist between the adjacent transverse plates and are the same; the lead screws are rotationally mounted in the through holes and located on one side of the transverse plate, and the number of the lead screws is equal to that of the transverse plate; the moving frame is movably mounted on the outer side of the lead screw, a chute is formed in one side of the moving frame, and the part provided with the chute is slidably attached to the surface of the transverse plate. According to the low-voltage high-power high-efficiency permanent magnet synchronous motor provided by the invention, small-amplitude shaking of the movable plate in the notch can be realized through the shaking assembly, a cleaned mixture is prevented from being adhered to the movable plate, and subsequent cleaning is facilitated.

The invention discloses a novel stator and rotor structure of a vehicle-mounted motor and the vehicle-mounted motor. The novel stator and rotor structure comprises a rotor and a stator arranged outside the rotor in a sleeving mode. The stator is provided with tooth parts which are annularly distributed on the iron core at intervals, the tooth parts are provided with windings, and a tooth groove capable of accommodating the windings is formed between any two adjacent tooth parts; the rotor is provided with ten magnetic poles, the outer surface of each magnetic pole is provided with a corresponding air gap line group, each section of air gap line group at least comprises a section of outer arc, the outer arc corresponding to each magnetic pole is a non-concentric arc, and the center of a circle formed by the centers of the outer arcs is the center of the rotor; each air gap line set further comprises side arcs located on the two sides of the outer arc, and second flat cutting sections are further arranged between the outer arc and the side arcs. According to the stator and rotor structure of the novel vehicle-mounted motor and the motor, the back electromotive force harmonic content can be effectively improved, the torque pulsation is reduced, the radial electromagnetic force is reduced, and the noise generated when the motor rotates is reduced.

The present invention discloses a split-type orbital rotor permanent magnet direct-drive wind turbine generator. The generator has a split-type structure and includes a main shaft. A stator is provided on the front circumferential surface of the main shaft. The stator is composed of multiple identical stator units spliced ​​in sequence along the circumferential direction to form a complete ring. A rotor composed of multiple rotor units is rotatably connected to the circumferential surface of the stator. The circumferential surface of the rotor is evenly distributed with multiple blades. The outer ring of the stator unit bracket is provided with a track and an iron core coil. The rotor unit bracket is correspondingly provided with a supporting roller and a magnetic pole module. The air gap is adjusted by the size of the roller. In addition, a cooling unit is provided through the structure of the generator itself. Through structural innovation, the present invention breaks through the volume and diameter limitations of the generator, realizes a main bearing-free design, reduces the electromagnetic air gap, and ensures a uniform circumferential air gap. The overall split-type modular design is adopted, which is convenient for production and transportation, thereby achieving the goal of reducing the cost of the generator and breaking free from foreign constraints.

The invention discloses a stator assembly, a motor and electrical equipment, the stator assembly comprises a stator yoke part and a plurality of first stator teeth and a plurality of second stator teeth which are alternately arranged on the periphery of the stator yoke part at intervals along the circumferential direction, each first stator tooth comprises a first tooth part and a first tooth crest, and each second stator tooth comprises a second tooth part and a second tooth crest, the minimum tooth width W1 of the first tooth part, the minimum tooth surface width W2 of the first tooth crest, the minimum tooth width W3 of the second tooth part, the minimum tooth surface width W4 of the first tooth crest, the minimum distance L1 between two adjacent first tooth crests and the minimum distance L2 between the adjacent first tooth crest and second tooth crest meet the following conditions: (L1 / L2) * (W1 / W3) * (W2 / W4) is more than 10 and less than 40, W1 is more than W3, and W2 is more than W4; at least one side of the first tooth crest along the circumferential direction is provided with a first groove, and the notch of the first groove is opposite to the stator yoke part. According to the stator assembly provided by the invention, the back electromotive force of the motor can be maximized, and the performance of a torque current line curve is better, so that the output capability and efficiency of the motor are improved, and the cogging torque and the torque pulsation can be reduced.

A power tool with a combined printed circuit board (PCB) that reduces internal wiring of the power tool and provides a large amount of air flow to internal components. In some instances, the combined PCB has a surfboard shape and includes a motor control unit and power switching elements (Field Effect Transistors or FETs). The combined surfboard PCB is located above the trigger, but below the motor and drive mechanism. In other instances, the combined PCB has a doughnut shape and is located coaxially with a motor shaft. The combined PCB may be positioned between a doughnut-shaped control PCB and the motor.

An electric motor (1) is provided with a stator (2) in which stator coils (2B) are arranged circumferentially. A center point of the circumference is defined as a first center point (O1), and a position offset from the first center point (O1) is defined as a second center point (O2). The electric motor (1) comprises: a ring rotor (3) arranged within the stator (2) and having an annular shape around the second center point (O2); an eccentric shaft (4) mounted so that it is rotatable about the first center point (O1) and supports the ring rotor (3) so that the ring rotor (3) is rotatable about the second center point (O2); an output section (5) that outputs a rotation of the ring rotor (3); and a detector (7) that detects a position of the ring rotor (3) or the eccentric shaft (4). and a controller (8) that controls a time for the excitation of each of the stator coils (2B) based on a detection signal from the detector (7).

The invention discloses a hybrid magnetic barrier design method for improving the average torque of a permanent magnet generator, the motor type is a double permanent magnet vernier motor, a stator and a rotor are provided with permanent magnets, the stator is wound with an armature winding, and an air gap magnetic field is composed of a stator permanent magnet magnetic field, a rotor permanent magnet magnetic field and an armature magnetic field. The average torque is derived from the interaction of an armature magnetic field and stator and rotor permanent magnetic fields. The stator is composed of six E-shaped module units in space, non-air-gap magnetic barriers exist between the module units, air-gap magnetic barriers are added to the two sides of a permanent magnet of the stator and the two sides of a permanent magnet of the rotor respectively, and the average torque is improved by improving the working wave content of an armature magnetic field and the working wave content of a permanent magnet magnetic field through the two types of magnetic barrier structures respectively. The hybrid magnetic barrier is simple in structure, the average torque of the permanent magnet vernier motor can be improved by more than 30%, and meanwhile, the sine property of no-load back electromotive force is improved.