773results 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 motors, and provides a multi-cooling permanent magnet synchronous variable frequency motor which comprises a shell, a stator and a rotor and further comprises a plurality of cooling fins, a cooling fan, a water cooling mechanism and a driving mechanism, the cooling fins are fixedly connected to the outer portion of the shell, the cooling fan is coaxially and fixedly connected with the rotor, and the water cooling mechanism is fixedly connected with the stator. An air outlet is formed in the shell, the water cooling mechanism is used for conducting water cooling on the shell and comprises a cold water pipe and a heat dissipation pipe network, the cold water pipe penetrates through the multiple cooling fins, the top of the heat dissipation pipe network communicates with the top of the cold water pipe through a water supply pipe, and the bottom of the heat dissipation pipe network communicates with the bottom of the cold water pipe through a water return pipe; the heat dissipation pipe network is located outside the shell and corresponds to the air outlet in position, and the driving mechanism is used for driving cold water to circularly flow in the cold water pipe and the heat dissipation pipe network. By means of the technical scheme, the problem that in the prior art, a single cooling mode is limited in cooling effect is solved.

The invention provides a double-squirrel-cage permanent magnet motor with a fractional slot concentrated winding and a pole-changing switching method, the motor comprises a stator and a rotor, the stator comprises a stator winding design and a winding pole-changing switching method, and two groups of conducting bars are arranged on the outer circumferential side of the rotor. The two groups of conducting bars are respectively connected with the two end rings to form two independent double-squirrel-cage structures, and each conducting bar corresponds to a permanent magnet steel magnetic pole distributed in the circumferential direction of the rotor. Two groups of conducting bars are arranged on the outer side of the rotor, and the two groups of conducting bars are respectively connected with the two end rings to form two independent double-squirrel-cage structures. The independent double-squirrel-cage structure not only can filter specific-order magnetomotive force harmonics generated by a stator winding, but also greatly reduces the magnetic leakage phenomenon due to the position relation between the conducting bars and the magnetic poles of the permanent magnets, so that the blocking effect of the conducting bars on a permanent magnetic circuit is reduced to the minimum, the utilization rate of the permanent magnets is improved, and the cost is reduced.

The invention provides a built-in motorized spindle permanent magnet synchronous motor structure for a horizontal machining center. The built-in motorized spindle permanent magnet synchronous motor structure comprises a stator water-cooled jacket, a stator iron core, a rotor iron core, a permanent magnet and a motorized spindle rotating shaft. The motorized spindle motor is actually a shell-free motor, a motorized spindle rotating shaft and a machine tool spindle are combined into a whole, and a motorized spindle shell and a stator water-cooled jacket are combined into a whole. According to the motorized spindle motor structure disclosed by the invention, virtual teeth with unequal widths are additionally arranged on the tooth crests of the stator iron core, and the tooth crests are chamfered with unequal angles; a rotor core adopts non-uniform segmented herringbone skewed poles, magnetic steel included angles are arranged in an equal difference mode, and pole staggering is achieved through installation of auxiliary round holes. The permanent magnet adopts non-uniform blocks with unequal widths and unequal thicknesses; and the magnetic isolation bridge adopts a differentiated shape. The invention has the advantages of compact structure, short transmission chain length, smaller harmonic content, electromagnetic vibration suppression and the like.

The embodiment of the invention provides a rotor assembly, a permanent magnet synchronous motor, a traction system and a vehicle. The rotor assembly comprises a rotor iron core which is provided with a plurality of permanent magnet grooves which are uniformly distributed along the circumferential direction; the permanent magnets are arranged in the permanent magnet grooves; the plurality of magnetic conductive blocks are arranged corresponding to the plurality of permanent magnet grooves, and each magnetic conductive block is arranged on one side, close to the rotating shaft, of the corresponding permanent magnet groove along the radial direction; the magnetic conductive block is configured to move between a first position close to the permanent magnet groove and a second position far away from the permanent magnet groove so as to adjust the magnetic field distribution of the rotor assembly.

The invention discloses a Halbach array type permanent magnet auxiliary synchronous reluctance motor rotor structure, and relates to the technical field of motor rotors. The rotor structure comprises three layers of magnetic barrier structures. The three-layer magnetic barrier structure comprises a first-layer U-shaped structure, a second-layer U-shaped structure and a third-layer double-J-shaped structure; wherein each layer of structure comprises Halbach array segments formed by permanent magnets and air slots which are arranged at intervals, and the included angle between every two adjacent permanent magnets in each layer is a fixed angle. Through the design of the three-layer magnetic barrier structure, each layer of permanent magnet is divided into a plurality of sections, and the magnetizing direction of the permanent magnet is changed by adjusting the included angle between each section of permanent magnet, so that a Halbach array structure is formed, and the torque ripple is reduced.

The present disclosure provides a multi-excitation-source axial-flux permanent-magnet motor with partitioned, hierarchical, and variable poles, and a variable-condition driving control system. The motor mainly includes a main magnetic pole and an auxiliary magnetic pole. The main magnetic pole is responsible for providing a main air gap flux and is connected in series with a dual-stator magnetic circuit. The auxiliary magnetic pole is responsible for adjusting an air gap field and is connected in parallel with the dual-stator magnetic circuit. Magnetic fluxes of the main magnetic pole and the auxiliary magnetic pole together constitute the air gap field. The present disclosure can control a flux path of the auxiliary magnetic pole by controlling the magnitude of a current applied to a field winding, thereby adjusting an air gap flux, expanding a speed range of the motor, and achieving variable-condition operation of the motor.

An electric machine designed as a permanently excited synchronous machine, including a rotor with a rotor body arranged on a rotor shaft, a stator, and a displacement device that generates a relative axial movement between the rotor body and the stator based on a torque produced between the rotor shaft and the rotor body. The displacement device has first and second displacement elements and at least one rolling body arranged between the first and second displacement elements. The first displacement element is axially movable and rotatable to a limited degree on the rotor shaft, and the second displacement element is connected to the rotor shaft rotationally fixed. The displacement elements provide that upon rotation of the first displacement element relative to the second or vice versa, the rotor body is pushed on the rotor shaft axially against the spring force.

The invention discloses a driving permanent magnet synchronous motor with a heat dissipation mechanism, and relates to the technical field of 999. The outer side face of the rear end cover is fixedly connected with the inner side face of a base, a copper bar is embedded in the side, away from a shell, of the rear end cover, the inner side face of the rear end cover is fixedly connected with the surface of the copper bar, the side, away from the rear end cover, of the copper bar makes contact with the base, and the base is grounded; the air cooling assembly is fixedly connected with the end, close to the rear end cover, of the rotating shaft, the natural cooling assembly surrounds the outer portion of the shell, the inner side face of the natural cooling assembly is fixedly connected with the outer side face of the shell, the natural cooling assembly can increase the contact area with the outside, and the heat dissipation effect is enhanced. The rear end cover sucks air in the gap of the natural cooling assembly into the rear end cover to form flowing airflow, so that a better cooling effect is achieved, and the cooling effect of the air cooling assembly is radiated to the outside of the shell.

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.

Examples are disclosed that relate to an electric machine (102) that achieves independent speed, variable frequency power generation and has increased power density, efficiency, reliability, and reduced complexity relative to conventional electric machines. In one example, an electric machine (102) includes a stator (200), a first stationary winding (202) coupled to the stator (200), a second stationary winding (204) coupled to the stator (200), and a rotor (206). The second stationary winding (204) includes a plurality of winding segments (218) corresponding to a number of phases of power of the electric machine (102). The rotor (206) extends through the stator (200) and the second stationary winding (204). The rotor (206) includes a plurality of rotor segments (220.1, 220.2, 220.3). Each rotor segment (220) of the plurality of rotor segments (220.1, 220.2, 220.3) includes a plurality of pole lobes (222.1, 222.2, 222.3) that extend radially from the rotor segment (220). Two or more pole lobes (222) of each rotor segment (220) are located on opposing sides of a corresponding winding segment (218) of the second stationary winding (204).

The invention discloses a slotless permanent magnet motor based on a Halbach array, and belongs to the technical field of motor design and manufacturing. A rotor of the slotless permanent magnet motor is coaxially arranged in a stator, the stator comprises a stator iron core and a stator winding, the rotor comprises a permanent magnet and a rotor iron core, the permanent magnet is fixed on the outer wall of the rotor iron core and adopts a two-section Halbach array, the permanent magnet is composed of an auxiliary magnetic pole and a main magnetic pole, and an air gap is arranged between the stator iron core and the rotor. The stator winding is suspended in the air gap; during parallel magnetization, the magnetization directions of the permanent magnets of the Halbach array are along the tangential direction of the rotor, the magnetic pole directions are the same, and the main magnetic poles and the auxiliary magnetic poles both adopt a parallel magnetization mode; during radial magnetizing, the magnetizing direction of the permanent magnets of the Halbach array is in the radius direction of the rotor, the polarities of the adjacent permanent magnets are alternately arranged, the main magnetic poles adopt a radial magnetizing mode, and the auxiliary magnetic poles adopt a tangential magnetizing mode. According to the slotless permanent magnet motor, through directional magnetic field superposition of segmented magnetic poles, reverse magnetic leakage is reduced, air gap flux density is improved, and copper loss and iron loss are reduced.

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 present invention discloses a multi-pole and few-slot unitized permanent magnet hub motor and a coordinated control system and method. The motor is composed of N identical motor units uniformly distributed in the circumferential direction of a radial section, each 1 / N outer rotor is divided into M identical rotor segments along the axial direction, and the M rotor segments are rotated in sequence along the same rotation direction by a mechanical staggered angle arrangement; the constant torque area is divided into a first area and a second area, and the constant power area is divided into a third area to an eighth area. The control system includes two control modules, each of which is composed of a power electronic switch, a DSP controller and an inverter connected in series in sequence, the input ends of the two power electronic switches are respectively connected to the output ends of a battery, the output end of each inverter is respectively connected to N / 2 winding electronic switches, one winding electronic switch controls the on and off of a centralized winding in a motor unit, and the mutually independent winding electronic switches realize independent control of the motor unit, thereby improving the motor control freedom and operation efficiency.

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 full water cooling structure of a permanent magnet synchronous motor of an electric automobile, a casing is connected with a bearing chamber through a casing end cover, a spiral water channel is arranged in the casing, and a water inlet and a water outlet are arranged on the outer side of the spiral water channel; a bearing is installed in the bearing chamber and connected with the bearing chamber front end cover and the bearing chamber rear end cover, a hollow shaft provided with a water way is connected with the bearing chamber, a heat dissipation water way is formed in the machine shell end cover, and a cooling medium forms a closed cooling path through the water inlet, the water outlet, the machine shell, the machine shell end cover, the bearing chamber and the hollow shaft. According to the utility model, the casing is connected with the bearing chamber and the hollow shaft through the casing end cover to form a closed waterway structure in which the casing is communicated with the bearing, and heat generated in the bearing, the hollow shaft and the motor is taken away through the flowing of cooling liquid; cooling liquid is immersed in the bearing chamber, so that the heat dissipation capability of the bearing is improved; the heat dissipation water channel is arranged in the casing end cover and is directly connected with the bearing chamber, heat in the motor is dissipated through the casing end cover, and the overall heat dissipation capability of the motor is improved.

The embodiment of the invention provides a rotor assembly, a permanent magnet synchronous motor and a vehicle, and the rotor assembly comprises a rotor iron core which is provided with a plurality of permanent magnet grooves which are uniformly distributed in the circumferential direction; the permanent magnets are arranged in the permanent magnet grooves; the plurality of magnetic conductive blocks are arranged corresponding to the plurality of permanent magnet grooves; the plurality of moving units are respectively connected with the plurality of magnetic conductive blocks and are used for driving the magnetic conductive blocks to move between a first position close to the permanent magnet grooves and a second position far away from the permanent magnet grooves along the radial direction so as to adjust the magnetic field distribution of the rotor assembly; the moving unit comprises a first moving unit arranged at the first end, in the axial direction, of the magnetic conductive block, the first moving unit comprises a first lead screw and a first moving seat, the first moving seat is connected with the magnetic conductive block, and the first lead screw drives the first moving seat to move through threaded transmission between the first lead screw and the first moving seat so as to drive the magnetic conductive block to move.

The invention provides a rotor slotting device and a bilateral permanent magnet motor thereof, the rotor slotting device is structurally composed of a stator and a rotor and is of an outer stator and inner rotor structure, and an air gap exists between the rotor and the stator. A permanent magnet and an armature winding are arranged on a stator, the stator is slotted, stator teeth are of split tooth structures so as to form a modulation pole, and first permanent magnets of which the magnetizing directions are all outward or inward in the radial direction are embedded on the teeth. The rotor is of a salient pole structure and is embedded with a second permanent magnet of which the magnetizing directions are all outward or inward in the radial direction, the two sides of the second permanent magnet are provided with slots of a straight line and arc line or multi-section fold line combined structure, the bending directions of the slots point to the axis of the magnetic pole, and the rotor is fixed on the rotating shaft and serves as a unique mechanical port of the motor. Rotor iron loss can be obviously reduced, and the problem that iron loss is too high when the permanent magnet motor operates is relieved.

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.

The embodiment of the invention provides a rotor assembly, a permanent magnet synchronous motor and a vehicle, and the rotor assembly comprises a rotor iron core which is provided with a plurality of permanent magnet grooves which are uniformly distributed in the circumferential direction; the permanent magnets are arranged in the permanent magnet grooves; the plurality of magnetic conductive blocks are arranged corresponding to the plurality of permanent magnet grooves; the plurality of moving units are respectively connected with the plurality of magnetic conductive blocks and are used for driving the magnetic conductive blocks to move between a first position close to the permanent magnet grooves and a second position far away from the permanent magnet grooves along the radial direction so as to adjust the magnetic field distribution of the rotor assembly; the moving unit comprises a first moving unit arranged at the first end of the magnetic conductive block in the axial direction, the first moving unit comprises a first connecting rod and a first wedge-shaped sliding plate, the first connecting rod is fixedly connected with the magnetic conductive block, and a first guide groove inclined relative to the axial direction is formed in the first wedge-shaped sliding plate; the end, away from the magnetic conductive block, of the first connecting rod abuts against the first guide groove, and when the first wedge-shaped sliding plate moves in the axial direction, the first connecting rod and the magnetic conductive block are guided to move in the radial direction.

The invention discloses a dual-redundancy permanent magnet synchronous motor based on a dual-redundancy brushless rotary transformer. The dual-redundancy permanent magnet synchronous motor comprises a synchronous motor body and a rotary transformer. The motor body adopts an armature duplex winding with double windings, and the rotary transformer rotor component adopts a rotary transformer rotor duplex winding coil with double windings and an annular transformer rotor duplex winding; the rotary transformer stator component adopts a rotary transformer stator duplex winding with double windings and an annular transformer stator duplex winding, that is, the synchronous motor body and the rotary transformer of the dual-redundancy permanent magnet synchronous motor both adopt a structure with double windings. When any one of the armature duplex winding, the rotary transformer rotor duplex winding coil, the ring transformer rotor duplex winding, the rotary transformer stator duplex winding and the ring transformer stator duplex winding breaks down, the other backup winding can continue to work, and the reliability of the duplex winding motor is two times that of a single winding motor. Therefore, the reliability of the permanent magnet synchronous motor is improved.

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.

The invention relates to the technical field of motors, and discloses a reluctance-assisted permanent magnet synchronous motor and an assembly thereof. The reluctance-assisted permanent magnet synchronous motor comprises a casing, and two groups of end covers are fixedly mounted at the front end and the rear end of the casing. According to the reluctance-assisted permanent magnet synchronous motor and the assembly thereof, in order to enable the motor body to operate more stably and lower noise, the movement mechanism is arranged, a wire on each stator winding can serve as a loop of any two other input wires, each group of stator pieces can form an independent magnetic field, and the three groups of stator pieces alternately generate a magnetic field, so that the motor body is more stable in operation and lower in noise. When the motor body operates, the rotor piece synchronously rotates along with the rotation of the stator piece, a shunt magnetic conduction structure is adopted, so that the cogging torque is eliminated, and the built-in magnetic steel is adopted, so that the effects of low speed, large torque, weak magnetic field and high speed are achieved by fully utilizing the magnetic resistance torque. Therefore, the motor body is more stable in operation and lower in noise.

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.