54results about How to "Reduce torque fluctuation" patented technology

In order to solve the problems of small torque density, large vibration and noise and the like of an axial magnetic flux permanent magnet motor, the utility model provides a three-stator disc and double-rotor disc type axial magnetic flux permanent magnet motor, which comprises a first stator disc, an upper rotor disc, a second stator disc, a lower rotor disc and a third stator disc which are sequentially distributed along the axial direction, the upper rotor disc consists of an upper rotor iron core, and a first permanent magnet group and a second permanent magnet group which are fixedly connected to two axial sides of the upper rotor iron core; the lower rotor disc is composed of a lower rotor iron core, and a third permanent magnet group and a fourth permanent magnet group which are fixedly connected to two axial sides of the lower rotor iron core; the circumferential dislocation included angle between the first permanent magnet set and the second permanent magnet set is theta, the circumferential dislocation included angle between the third permanent magnet set and the fourth permanent magnet set is theta / 2, through the structural arrangement, the peak values and valley values of torque ripples and cogging torque ripples of the two rotors are superposed, the overall output torque ripple and cogging torque are effectively reduced, vibration and noise are reduced, and the service life of the motor is prolonged. And the safety, stability and reliability of operation are improved.

The invention discloses a torsional vibration suppression strategy for an electric drive system based on a double-layer model predictive control, and relates to the technical field of electric vehicle motors. The invention establishes a mathematical model of a permanent magnet synchronous motor taking into account the dynamic characteristics of the motor based on a stator voltage equation in a d-q coordinate system; based on the dynamics of a gear system, a 19-degree-of-freedom gear transmission system model is established taking into account nonlinear factors such as time-varying meshing stiffness, meshing error, and tooth side clearance; based on the model of the electric drive system, a torsional vibration suppression strategy based on a double-layer model predictive control is proposed, which suppresses the torsional vibration of an integrated electric drive system by controlling the motor target torque and reducing current harmonics and torque fluctuations, thereby enhancing the stability of the electric drive system and improving the comfort of the whole vehicle.

The invention discloses a wind wave and flow comprehensive power generation device based on a novel semi-submersible floating platform. The wind wave and flow comprehensive power generation device comprises a wind power generation device, the semi-submersible floating platform, a wave energy absorbing device, a tidal current energy power generation device and a catenary type mooring device. The wind power generation device is arranged above the semi-submersible floating platform, the tidal current energy power generation device is arranged below the semi-submersible floating platform, and the wave energy absorption device is arranged on a truss supporting structure of the semi-submersible floating platform; the upper end of the catenary mooring is fixed to a buoy of the semi-submersible floating platform, and the lower end of the catenary mooring is fixed to a seabed through an anchor structure. According to the integrated power generation device, integrated power generation is achieved through combination of wind energy, wave energy and tidal current energy, wave energy power generation and tidal current energy power generation are increased on the basis of offshore wind power generation while the ocean utilization area is not increased, the energy output of a unit sea area can be increased, and economic benefits are improved.

The invention provides a rotor punching sheet of a high-efficiency permanent magnet synchronous motor, and relates to the technical field of permanent magnet synchronous motors. The rotor punching sheet provided by the invention is designed according to the following steps: according to symmetry, one pole of the motor rotor punching sheet is designed to be a sector, the unfolding angle of the sector is 180 / p degrees, and p is the number of pole pairs; the center axis of the sector, the boundary straight line and the inner arc line of the motor stator are taken as the reference, the boundary position of the hole is drawn by adopting a geometric construction method, the formed hole is used for inserting the permanent magnet with the rectangular section, and the permanent magnets in the hole have the same specification. According to the invention, serialized high-efficiency permanent magnet rotor punching sheets can be rapidly designed, and the motor cost is reduced; the outer side area of the pole part is small, so that the stress of the rotor reinforcing rib is small; the linear permanent magnets are small in width, so that the flux density of the stator is reduced, and the iron loss of the stator is reduced; the permanent magnets with rectangular cross sections can be inserted into the rotor iron core formed by laminating the punching sheets, so that the manufacturing and mounting cost of the permanent magnets is reduced.

The present invention provides a flapping-gliding switching mechanism, method and system of a flapping-wing flying robot, and relates to the technical field of unmanned aerial vehicles. The mechanism includes: a main beam, a mounting frame, a motor, a gear assembly and a crank-connecting rod assembly, wherein the mounting frame is mounted on the main beam and arranged below the main beam; the gear assembly is mounted on the mounting frame, and the motor drives the gear assembly to rotate; two crank-rocker arm structures are respectively mounted on both sides of the gear assembly and are symmetrically arranged, one end of the crank-connecting rod assembly is connected to the output shaft of the gear assembly, and the other end of the crank-connecting rod assembly is rotatably mounted on a fixed frame, and the fixed frame is mounted on the mounting frame; when the flapping mode is switched to the gliding mode, the motor drives the crank-rocker arm assembly to rotate so that the wing hovers at the target flapping angle, which solves the problems of failure rate and difficulty in changing the wing flapping angle during gliding under the traditional mechanical solution.

The utility model relates to the technical field of motors, particularly provides a motor rotor, a motor and a vehicle, and aims to solve the problem that the conventional motor rotor is relatively serious in vibration and noise in a high-speed operation process. In order to achieve the purpose, the motor rotor comprises an iron core, the iron core comprises a plurality of punching sheets, the plurality of punching sheets are laminated, the punching sheets are provided with a plurality of magnetic steel groove groups, the plurality of magnetic steel groove groups are uniformly arranged at intervals along the circumferential direction of the punching sheets, and the magnetic steel groove groups are asymmetrical along the radiuses of the punching sheets. The magnetic steel groove group is of an asymmetric structure, so that the magnetic circuit of the motor rotor is improved, the resonance of the motor rotor can be optimized, the NVH characteristic of the motor in the operation process is improved, and the torque ripple and the radial electromagnetic force are reduced.

This application relates to the technical field of motor core production, and particularly to a stamping device and process for stacking double-outer-diameter short-common-edge laminations for EV new energy vehicles. The device includes a frame, an upper die base mounted on the frame, a control component slidably connected to the upper die base, an outer-diameter switching punch mounted on the control component, and a stamping cutter mounted on the upper die base. The frame is equipped with a hydraulic component that drives the upper die base to move up and down. The control component drives the outer-diameter switching punch to extend or retract to the lower end face of the stamping cutter. When the outer-diameter switching punch extends, it cooperates with the stamping cutter to stamp the smaller outer-diameter stator laminations; when the outer-diameter switching punch retracts, only the stamping cutter stamps the larger outer-diameter stator laminations. This application improves the efficiency of core processing.

The present application provides a rotor assembly and a permanent magnet motor. The rotor assembly comprises a rotor core (1), a mounting groove (2) is arranged circumferentially on the rotor core (1), a permanent magnet (3) is installed in the mounting groove (2), first air grooves (4) are arranged at both ends of the mounting groove (2), a second air groove (5) is arranged between the magnetic pole center line and the first air groove (4) and on one side close to the first air groove (4), the first air groove (4) extends a first extension portion (8) toward the magnetic pole center line, and the first extension portion (8) and the second air groove (5) are arranged at intervals. According to the rotor assembly of the present application, the torque fluctuation of the permanent magnet motor during operation can be greatly reduced under the premise of ensuring the electromagnetic torque of the motor.

The utility model provides a three-phase hybrid stepping motor, which belongs to the technical field of motors, mainly aims at solving the problem that a traditional stepping motor is easy to generate torque fluctuation and vibration, and adopts the following technical scheme that the three-phase hybrid stepping motor comprises a base and a top cover, the base is connected with the top cover through a shell, and a mounting through cavity is arranged in the shell; a coil assembly is arranged in the mounting through cavity, a heat dissipation shell is arranged on the outer surface of the shell, a rotor is further arranged between the base and the top cover and located in the center of the coil assembly, rotating shafts are arranged at the top and the bottom of the rotor, an opening is formed in the top of the top cover, and one rotating shaft penetrates through the opening; through the arrangement of the coil assembly, the torque ripple can be reduced through the multiple sets of coils and the multiple sets of stators, through the arrangement of the two sets of stabilizing rings and the two sets of bearings, the motor vibration can be reduced, the problem that torque ripple and vibration are prone to occurring in a traditional stepping motor is solved, noise is reduced, and the service life of the motor is prolonged.

This utility model discloses a rotor lamination for a unipolar motor and the unipolar motor itself. The rotor lamination has at least two circumferentially spaced magnetic slots on its end face. The outer circumferential surface of the rotor lamination has a groove. Each magnetic slot has a groove at both ends, which are respectively the entry end and the exit end. The groove near the entry end is the first groove, and the groove near the exit end is the second groove. The width of the first groove and the second groove along the circumferential direction of the rotor lamination and / or the depth along the radial direction of the rotor lamination are different. By setting the width and / or depth of the first groove and the second groove to be different, the width of the permanent magnet pole face towards the air gap can be adjusted, thereby reducing the leakage magnetic flux at both ends of the permanent magnet pole. It also makes the magnetic flux density of adjacent magnetic poles more symmetrical, and can reduce the odd and even harmonics in the air gap magnetic flux density, thereby reducing the back EMF harmonic content and reducing torque ripple.

The invention relates to the technical field of motors, in particular to a stator punching sheet, a stator iron core comprising the stator punching sheet and an external rotor motor comprising the stator iron core. The stator punching sheet is annular, twelve stator tooth grooves used for winding stator windings are evenly formed in the outer periphery of the stator punching sheet at intervals in the circumferential direction, the diameter of the outer circle of the stator punching sheet is D1, the diameter of a virtual circle concentric with the outer circle on the stator punching sheet is D2, D2 / D1 is equal to 0.45-0.5, the area of an annular area between the outer circle and the virtual circle is the effective magnetic circuit area, and D1 is larger than D1 and smaller than D2. The stator tooth grooves are located in the annular area, and the proportion of the total area of the 12 stator tooth grooves to the effective magnetic circuit area is 0.45-0.5. The effective size of the motor can be reduced, the torque ripple of the motor is reduced, and the operation efficiency of the motor is improved.

The application provides a function type hybrid control method of an electric special vehicle driving motor, which combines a fuzzy PID algorithm and a conventional PID control algorithm through a switching function to obtain the comprehensive advantages of the two control algorithms. Meanwhile, in order to reduce the calculation burden and execution time of the controller and facilitate engineering implementation, a fuzzy proportional algorithm with the transient performance of the fuzzy PID algorithm is adopted instead. According to the operating conditions of the special vehicle, the operating state of the motor is segmented for research, and a set of rules or a separate fuzzy algorithm is used to determine the weight of the outputs of the two control algorithms. However, an additional fuzzy calculation is required, which increases the calculation time and gain constant adjustment, reduces the switching frequency of the control system, causes higher torque fluctuation, and further designs a switching function to calculate the output weight control of the two algorithm outputs, which not only reduces the torque fluctuation caused by redundant calculation, but also ensures that the vehicle driving motor works in the optimal control state.

The invention provides a hub motor, which relates to the technical field of hub motors for two-wheeled vehicles. The hub motor comprises a rotor and a stator. The rotor is sleeved on the outside of the stator. Tangential magnetic steel slots are evenly arranged circumferentially inside the rotor. The tangential magnetic steel slots include tangential slot bodies and magnetic bridge grooves. The outer wall of the stator is evenly opened circumferentially with radial winding slots. The tangential magnetic steel slots and the radial winding slots satisfy the following relationship: α2=K*360° / 2p, 0.6≤K≤0.95, α1=360° / Z, α3>α1>α2, α1 represents the slot angle, α2 represents the magnetic bridge angle, α3 represents the pole angle, 2p represents the number of motors, K represents the formula coefficient, and Z represents the number of radial winding slots. The invention can not only effectively reduce magnetic steel leakage and improve the utilization rate of magnetic steel, but also has good anti-demagnetization ability, uniform magnetic field, small torque fluctuation, good running performance, high speed, sufficient power, and is suitable for high-speed electric motorcycles.

The utility model relates to wind power generation technical field discloses wind power generation device, including support subassembly, wind wheel subassembly and power generation subassembly, wind wheel subassembly includes main shaft and impeller, and the main shaft fixed mounting is in support subassembly, and the impeller rotatablely installs on the main shaft, power generation subassembly includes first power generation unit and second power generation unit, and the stator of first power generation unit and second power generation unit all fixed mounting is in main shaft, and the outer rotor of first power generation unit and second power generation unit all are connected with the impeller fixedly, the utility model under the same wind force condition, first power generation unit and second power generation unit can work simultaneously, and the mechanical energy of impeller capture is more efficient, more fully converts into electric energy, effectively increases the overall power generation, improves the wind energy utilization efficiency and power generation efficiency, solves when the outside wind speed is at the low level, and the overall power generation of generator is insufficient.

The invention discloses a claw-shaped stator and a motor thereof; the stator tooth shoe is optimized to form a claw-shaped stator tooth shoe shape which is symmetrical about the tooth neutral line; under the premise of not affecting the fundamental wave amplitude of the air gap magnetic density and ensuring the output torque, the frequency of the tooth slot torque pulsation is increased, the amplitude is reduced, and the torque fluctuation is further reduced.

The invention discloses a rotor structure and a motor. The rotor structure comprises a rotor core, reinforcing ribs and a trimming structure, a plurality of magnetic poles are arranged in the circumferential direction of the rotor core, the plurality of magnetic poles comprise N-pole rare earth magnetic poles and S-pole rare earth magnetic poles which are arranged at intervals, and a plurality of layers of permanent magnet units are arranged in each magnetic pole and are symmetrically distributed about a d axis; reinforcing ribs are arranged between the symmetrical permanent magnet units; the outer surface of the N-pole rare earth magnetic pole is provided with the edge cutting structure corresponding to the permanent magnet unit, and the edge cutting structure is an eccentric elliptic arc surface, an eccentric arc surface or a cutting straight line section connected with the outer surface of the S-pole rare earth magnetic pole.

The invention relates to the technical field of short circuit ring assembly, and discloses a semi-automatic short circuit ring pressing device for a motor, which comprises a workbench, a belt conveyor is mounted at the top of the workbench, an angle plate is fixedly connected to the top of the belt conveyor, and a transmission assembly component for improving the placement precision of a short circuit ring is arranged above the belt conveyor. The transmission assembly component comprises a plurality of transmission belts for placing the short-circuit rings through self transmission thrust, high-precision placement of the short-circuit rings is achieved through transmission of the transmission belts to the short-circuit rings, the problem of contact between the short-circuit rings and the stator iron core is solved, firstly, the transmission belts ensure the stability of the short-circuit rings in the placement process, and the transmission efficiency of the short-circuit rings is improved; and the short circuit ring is accurately conveyed into the stator iron core through a transmission mechanism, so that the position deviation caused by manual operation is effectively avoided, the electrical performance of the motor is improved, the contact resistance is reduced, the local heating phenomenon is reduced, and the efficiency of the motor is favorably improved.

The present invention provides a short-pitch motor stator, including an iron core and a stator winding, wherein the iron core is provided with 48 stator slots, and insulating paper is arranged in the stator slots, and the insulating paper sequentially separates the stator slots into a first layer, a second layer, a third layer and a fourth layer from the outside to the inside in the radial direction of the iron core, and the stator winding has eight magnetic poles and is a six-phase winding, and each phase of the stator winding includes a first winding coil, a second winding coil, a third winding coil and a fourth winding coil respectively wound on the iron core. The stator winding of the present invention has a relatively compact structure, and helps to reduce the end height of the winding, thereby reducing the volume of the motor without changing the power. In addition, the use of a six-phase winding can expand the selection range of voltage and current, adapt to a variety of controllers, thereby optimizing the performance and cost of the motor system, and can improve the efficiency and torque density of the motor, and at the same time has the characteristics of strong fault tolerance and high reliability.

The rotor has a first rotor core and a second rotor core arranged in the axial direction and configured so that the positions of the magnetic poles are staggered from each other in the circumferential direction. The first rotor core and the second rotor core have a pair of first magnets constituting the magnetic poles and a pair of first magnet receiving holes for receiving the pair of first magnets. The first rotor core has a plurality of magnetic flux blocking parts that penetrate in the axial direction, and has a first magnetic flux blocking part and a second magnetic flux blocking part that overlap with the first magnet receiving hole of the second rotor core in at least a part in the axial direction. An imaginary line connecting the circumferential middle position of the pair of first magnets and the central axis is set as the first axis, and an imaginary line that is adjacent to the first axis in the circumferential direction and is magnetically orthogonal to the first axis and passes through the central axis is set as the second axis. The first magnetic flux blocking part is arranged between the first axis and the circumference of the first magnet, and the second magnetic flux blocking part is arranged on the second axis.

The invention relates to an electric motor-type feedback drive (2) for a steering system, comprising a brushless electric motor (4) having a wound stator (8) and having a rotor (10), the rotor (10) having a permanent magnet rotor magnet (26), the rotor magnet (26) having a number of magnetic poles magnetized in a Halbach arrangement, and the rotor magnet (26) having a plurality of magnetic poles magnetized in a Halbach arrangement. The rotor magnet (26) is arranged in a rotor housing (24) which engages in a rotationally fixed manner with the bearing cover plate (6).

The utility model belongs to the technical field of artificial heart-left ventricle auxiliary circulation equipment, and particularly discloses an LVAD motor stator system, which comprises an outer stator, an inner stator and a winding arranged between the outer stator and the inner stator, the inner stator is formed by stacking a plurality of silicon steel ring sheets, an axial modulation groove is arranged along the circumferential direction of the inner side of the inner stator, and the inner side of the inner stator is connected with the winding. According to the utility model, the modulation grooves are arranged in the inner stator, so that the harmonic amplitude is reduced, and the fluctuation of the torque is reduced. The utility model also discloses a motor which is filled with epoxy resin, so that the relative positions of related parts are ensured, the coaxiality and dynamic balance of the related parts are ensured, the motor is stable in high-speed operation, the vibration can be reduced, the motor has relatively good biological safety, relatively high heat conductivity coefficient and chemical stability, and the heat is quickly dissipated when the motor is in high-speed operation. The device is suitable for being placed in a human body.

The invention provides a stepping motor control system based on deep learning. The stepping motor control system comprises a P controller, an ADRC controller, a first PI controller, a second PI controller, a first coordinate transformation module, an SVPWM module, an inverter module and an encoder. The ADRC controller comprises a first LESO module and a second LESO module which are in cascade connection and is used for estimating the rotating speed disturbance quantity in the operation process of the stepping motor, the control performance of the angle and the rotating speed of the stepping motor in the actual application process can be effectively improved, and therefore the stepping motor can be better applied to an electric transmission system.

A built-in tangential mixed magnetic steel magnetism gathering type permanent magnet rotor relates to the technical field of motors, the rotor comprises a rotor iron core and a rotating shaft, the rotor iron core is provided with a plurality of permanent magnet units which are symmetrically arranged around the axis of the rotor iron core, and the permanent magnet rotor is characterized in that each permanent magnet unit comprises a middle magnetic steel, middle air permanent magnet grooves and radial magnetic steel are arranged between the adjacent permanent magnet units, the middle air permanent magnet grooves and the radial magnetic steel are arranged on the q shaft, the middle air permanent magnet grooves are arranged on the inner sides of the radial magnetic steel, and the middle magnetic steel and the adjacent radial magnetic steel on the two sides of the middle magnetic steel are arranged in a U shape. The rotor provided by the invention can reduce motor noise and torque ripple.

The application relates to a core, a motor component, a suspension motor, a suspension assembly and a vehicle. The core comprises a tooth portion and a yoke portion. An axle hole is arranged on the tooth portion; the yoke portion is independent of the tooth portion and coaxially connected with the tooth portion, the yoke portion at least partially protrudes from a first side surface of the tooth portion to form a winding mounting portion together with the first side surface; and at least one of the tooth portion and the yoke portion is an integrally-formed body. The core, the motor component, the suspension motor, the suspension assembly and the vehicle can solve the technical problem that the magnetic resistance of the suspension motor is relatively large and the magnetic leakage risk is relatively high in the related art.

The invention provides a sink roll sliding bearing zinc slag cleaning device which comprises an arm support body, at least two carrier roller mechanisms, a moving mechanism and a cleaning mechanism, and a sink roll is rotationally connected to the arm support body through a sliding bearing; the at least two carrier roller mechanisms are oppositely arranged on the arm frame at intervals, and each carrier roller mechanism is provided with a carrying part capable of rotating towards one side of the sink roller; according to the device, the carrying part rotates to support the sink roller, the movable part moves to enable the cleaning part to extend into a gap of the sliding bearing, and the cleaning part rotates in the circumferential direction of the sink roller to clean impurities such as zinc slag in the sliding bearing of the sink roller, so that the cleaning efficiency is effectively improved, the carrier roller mechanism enables the sink roller to be stably supported in the cleaning process, and the service life of the sink roller is prolonged. The sliding bearing cleaning device is simple in structure, avoids shaking or deviation, guarantees cleaning accuracy and safety, and meanwhile is beneficial to reducing abrasion and damage of the sink roll and the sliding bearing, thereby improving the cleaning effect of the sliding bearing of the sink roll.

The utility model discloses a kind of flat wire short-pitch winding and motor, flat wire short-pitch winding includes the U-phase parallel branch circuit wound on motor stator, V-phase parallel branch circuit and W-phase parallel branch circuit;U-phase parallel branch circuit to the outgoing line end of U-phase parallel branch circuit is set in outermost flat wire layer, neutral point is set in innermost flat wire layer;U-phase parallel branch circuit to the outgoing line end of U-phase parallel branch circuit is set in innermost flat wire layer, neutral point is set in outermost flat wire layer;3Q stator slots are spaced between the neutral point of U-phase parallel branch circuit to the outgoing line end of U-phase parallel branch circuit;The number of the U-phase parallel branch circuit, V-phase parallel branch circuit and W-phase parallel branch circuit is equal and equidistantly arranged;The utility model ensures that each parallel branch circuit is evenly distributed, avoids circulation problem;By using short-pitch winding, the harmonic of motor operation is reduced.

The utility model discloses a rotor lamination of unipolar motor and unipolar motor, the end face of rotor lamination is provided with at least two magnetic steel grooves along the circumferential interval, the end face of rotor lamination still has the arc lightening hole of extending along the circumferential direction of rotor lamination, the arc lightening hole is located the inside of magnetic steel groove and is set up with magnetic steel groove one to one, the corresponding central angle of arc lightening hole on rotor lamination is same with the corresponding central angle of magnetic steel groove on rotor lamination. The corresponding central angle of arc lightening hole on rotor lamination is configured to be same with the corresponding central angle of magnetic steel groove on rotor lamination, can block the conduction path of the magnetic force line of motor shaft to the center of rotor lamination of permanent magnet, reduces the magnetic flux leakage, reduces the torque fluctuation, reduces the vibration noise. The arc lightening hole can also guide the magnetic force line from the permanent magnet pole smooth conduction to the silicon steel pole, avoids the local magnetic force saturation.

The invention discloses a rotor punching sheet with an asymmetric auxiliary groove structure, a rotor core and a permanent magnet motor, and the rotor punching sheet comprises a plurality of unit parts, each unit part comprises a first pair of asymmetric auxiliary grooves and a second pair of asymmetric auxiliary grooves, and the first pair of asymmetric auxiliary grooves comprises a first left auxiliary groove and a first right auxiliary groove; the first left auxiliary groove and the first right auxiliary groove are located on the two sides of the magnetic pole d-axis. The second pair of asymmetric auxiliary grooves comprises a left auxiliary groove II and a right auxiliary groove II; the second left auxiliary groove and the second right auxiliary groove are located on the two sides of the magnetic pole d-axis. At least one of three parameters of the notch width, the notch depth and the offset from the notch bottom to the notch center between the first left auxiliary groove and the first right auxiliary groove is different; and at least one of three parameters of the notch width, the notch depth and the offset from the notch bottom to the notch center between the second left auxiliary groove and the second right auxiliary groove is different. The non-sinusoidal distribution of the air-gap magnetic field of the permanent magnet motor can be improved, and the harmonic content of the air-gap flux density is reduced, so that the vibration noise of the motor is reduced, and the operation stability of the motor is improved.

The present invention relates to a method for calculating the fault-tolerant current of a five-phase permanent magnet motor considering the second and fourth order torque fluctuations under an open circuit, which belongs to the field of multi-phase permanent magnet motors. The present invention is to improve the torque performance of a five-phase permanent magnet motor whose back electromotive force includes third and fifth order harmonics under an open circuit fault, so that the motor has the ability to operate smoothly under an open circuit fault. The method of the present invention only adjusts the phase of the non-open circuit phase current when an open circuit fault occurs, suppresses the second and fourth order torque fluctuation components related to the back electromotive force fundamental wave, third harmonic and fifth harmonic in the torque neutralization after the fault, so as to maintain the low torque fluctuation characteristics, and then realize stable fault-tolerant operation. The open circuit fault is divided into two types: a single-phase winding open circuit fault and an inverter switch tube open circuit fault. The limiting condition is that the zero-sequence current is not constrained. Under the premise of ensuring the torque output capacity of the motor, the present invention effectively reduces the torque fluctuation of the fault-tolerant operation of the five-phase motor when a single-phase winding open circuit fault and an inverter switch tube open circuit fault occur.

This invention provides a stator core, a rotary motor, and a drive device. The stator core is a stator core composed of multiple stacked steel plates, including: an annular core back centered on a central axis; and multiple pole teeth extending radially from the core back. The radially facing side of the core back is provided with multiple axially extending welded portions that fix the multiple steel plates together, and axially extending grooves. The multiple welded portions include a first welded portion, a second welded portion, and a third welded portion arranged sequentially in the circumferential direction. The angle formed by the central axis, the first welded portion, and the second welded portion is greater than the angle formed by the central axis, the second welded portion, and the third welded portion. The grooves are disposed between adjacent first and second welded portions in the circumferential direction.