232results about How to "Reduce copper loss" patented technology

The invention discloses an ultrathin high-power direct current magnetoelectric motor, comprising a transmission shaft, a discal stator component sleeved at the middle section of the transmission shaft, discal rotor components which are respectively arranged at the two sides of the stator component and rotate with the transmission shaft, and an upper end cap and a lower end cap which are respectively arranged at the two sides of the rotor components. The stator component comprises a discal stator frame, a plurality of fan-shaped grooves which are arranged on the stator frame in a ring form, fan-shaped windings arranged in the fan-shaped grooves, and inner clamping rings and outer clamping ring for fixing the fan-shaped windings. The rotor component comprises a rotor plate fixedly connectedwith the transmission shaft, fan-shaped grooves which are arranged on the rotor plate in a ring form, and permanent magnets fixed in the grooves. The surface of the rotor plate, which provided with the permanent magnets, faces the fan-shaped windings. The motor of the invention has the advantages of higher efficiency and energy saving, and the manufacturing, the assembling and the maintenance of the stator winding are more simple, convenient and reliable.

The invention discloses a multi-gear fault-tolerance permanent magnetism magnetic flux switching electric machine and a fault-tolerance method thereof, belonging to a permanent magnetism fault-tolerance electric machine and a method. The electric machine comprises a salient pole stator, an armature winding and a salient pole rotor. Stator salient poles are E-shaped stator iron blocks; bar-shaped permanent magnets are embedded into a gap between every two E-shaped stator iron blocks in sequence; and stator windings which are coils from a first coil to a sixth coil are wounded on two E-shaped arms connected with the bar-shaped permanent magnets. Since the method employs the multitooth fault-tolerance permanent magnetism magnetic flux switching electric machine, the self inductance of the armature winding is increased; when the multi-gear fault-tolerance permanent magnetism magnetic flux switching electric machine uses high-coercive force permanent magnets, the short circuit current if can be restrained within the rated current iL without considerably increasing the number of turns of the armature winding. The invention has high reliability; the armature magnetic field makes small impact on the permanent magnets; the multi-gear structures of the stator and the rotor of the electric machine enable the electric machine to have small mutual inductance, strong magnetism isolating capability, big electrical inductance, strong capability of restraining the short circuit current and reduced location torque.

The invention provides a transition asynchronous start permanent magnet synchronous motor and a pole changing and speed changing method and relates to a method applied to a permanent magnet synchronous motor. When the transition asynchronous start permanent magnet synchronous motor adopts a transition starting manner, a synchronous rotor iron core and one part of the radial outer surface of a permanent magnet leave away from the inner side of the inner surface of the iron core of the stator in a starting process, and the intensity of a rotor magnetic field established in a motor air gap of the permanent magnet is alleviated, so that a power generation braking torque generated by the permanent magnet is reduced, and the starting performance of the motor is easily improved. In a pole changing and speed changing synchronous operation process, a flux path of the rotor is changed, so that a rotor part of the transition asynchronous start permanent magnet synchronous motor can be automatically adaptive to change of the quantity of magnetic poles of the motor, so that the pole changing and speed changing of the permanent magnet synchronous motor can be realized.

The invention discloses a high-speed fuel gas injection electromagnetic valve for vehicles. In the invention, a part of the electromagnetic valve is sleeved in a fixed core of a magnetism conducting end cover, and one end of the outer end of the fixed core is fixedly provided with a shell of a connecting terminal, while the other end is provided with a valve seat; one end of the fixed core is connected with a gas inlet, while the other end is connected with a movable core; the interior of the fixed core is hollow, and two sides of the inner wall of the fixed core are adhered with copper pipes; an electromagnetic coil wrapped by a coil shell is wound on a coil framework fixed on the fixed core; a spring is arranged between an inner hole of the fixed core and a concave port of the movable core, and a sealing piece is fixed at the other end of the movable core; and the outer end of the movable core is provided with a valve seat, and the tail end of the valve seat is provided with a nozzle. The invention optimizes magnetic circuits, reduces the temperature raise, improves the response speed, prolongs the service life of the valve body and is easy to mass production.

The invention provides a magnetic flux modulate permanent magnet vernier motor with stator compose of an outer rotor, an inner rotor and a stator arranged in a motor housing in sequence from outside in, There are twelve outer rotor salient poles (2-1) on the inner surface of the outer rotor 2, and eight inner rotor salient poles (3-1) on the outer surface of the inner rotor (3) near the outer rotor side, close to the inner side of the stator. The surface has a round surface structure and is embedded with sixteen pairs of permanent magnets (3-2). The stator (4) is connected to the casing (1) byiron blocks (13). The stator core has six stator teeth on the circumference (4-1). ), and three magnetic flux modulation poles (4-2) are placed on each stator tooth, Armature winding (6) and direct current excitation winding (7) of three-phase centralized type with two pairs of pole pairs are simultaneously arranged in the stator slot. The invention has the advantages of increasing torque outputcapacity, torque density, speed regulating range and mechanical strength, and simple processing and assembly.

A method for making a wound stator of an automotive generator is provided for replacing the conventional winding technique. The method includes: forming a stator ring provided with a plurality of annularly arranged radial through slots; cutting a copper wire into a plurality of wire units each having a rectangular cross section; inserting the wire units into the through slots in an interlacing manner; and soldering wire ends of the wire units sequentially so as to form a connected loop.

An electrical rotating machine with permanent magnets which is configured such that the ratio of the number of magnetic poles of permanent magnets 3 to the number of magnetic poles of coils 12 is at 10:9 or 8:9. The coils 12 are configured such that a middle coil U− and two adjacent coils U+, U+ on both sides thereof are in-phase connected to be in-phase coils for each phase, and there is satisfied the relationship that T2>T1 and T2>T3, where T2 is the turn number of the middle coil U−, and T1 and T3 are the turn numbers of the adjacent coils U+, U+.

Arrangement at an electric machine, particularly motor, generator, or actuator, with a stator with teeth (11, 12) carrying coils (15), particularly one layer, for concentrated windings. A permanent magnetic rotor is movable relatively to the stator (11, 12). The teeth of the stator are arranged for receiving coils (15) with generally rectangular opening. Advantages are achieved if the stator teeth (11, 12) are provided to receive generally identical coils (15) closing the grooves (14, 16). The teeth (11, 12) may be alternating rectangular and converging/diverging toward the top, to provide grooves (14, 16), with parallel sides to enter the coils (15). The converging teeth (22) have preferably a shortened top (23). The grooves are preferably provided to make room for a semi magnetic groove wedge (17, 18) between adjacent teeth.

The invention provides a control method of a three-phase dual-active-bridge DC converter under a current optimal modulation. The method comprises a step of collecting DC side output voltage V2, DC side output current I2 and DC side input voltage V1 in each switch cycle, a step of multiplying the collected V2 by I2 to obtain a transmission power Po, at the same time multiplying V2 by a transformer transformation ratio N, dividing the above product by V1, and obtain a voltage transformation ratio d, a step of allowing Po and d to go through an optimal modulation strategy link to obtain the reference value D1* and D2* of duty ratios D1 and D2, and then obtaining the duty ratios D1 and D2 through two large inertia links or pure integrator links, a step of allowing the duty ratios D1 and D2 to go through an optimal amplitude limit value calculation link, and obtaining the optimal amplitude limit value Df_lim of a phase shift ratio, a step of carrying out difference comparison on a DC side output reference value V2ref and V2, allowing a difference to go through a PI regulator and an amplitude limit link with an amplitude limit value, and obtaining a phase shift ratio Df, and a step of obtaining the driving signal of each switch device according to the duty ratios D1 and D2 and the phase shift ratio Df, and driving a corresponding switch device.

The invention provides a method, which overlay connects axially track rings (11), (12), (13) in order, to make the rings has the same axis with a shaft line (P). Arranging axially each claw-like induced poles (22), (24), (26). When the axial end-face of A phase rear yoke (21) contacts with the other axial end-face of B phase rear yoke (23), the base ends of claw-like induced poles (22), (24) arranged along the axis with proper interval, axially grip alpha phase ring winding (14) and fixed the winding. When the other axial end-face of B phase rear yoke (23) contacts with the axial end-face of D phase rear yoke (25), the base ends of claw-like induced poles (242), (26) arranged along the axis with proper interval, axially grip beta phase ring winding (15) and fixed the winding.

The invention provides a stator (10) for an electric rotary machine which can be reduced in size by suppressing the projection of extending portions in the axial direction and which can enhance the performance thereof by suppressing the copper loss as a result of the length of the extending portions being reduced. The stator (10) includes: a stator core (21); and segmented coils (50) of a plurality of phases, wherein: the segmented coils (50) of a plurality of phases have pluralities of coil bars (25) which are inserted individually in a plurality of slots (23) in the stator core (21) and which extend substantially in a straight line and pluralities of connection coils (40) which connect together the coil bars (25) of the same phase to thereby make up extending portions; the connection coils (40) each comprise an inner connection coil (42) and an outer connection coil (41) which are disposed in different axial positions; and the inner connection coil (42) faces an outer connection coil (41) of a different phase in an axial direction and the outer connection coil (41) faces the inner connection coil (42) of a different phase in the axial direction.

A motive power system for an electric vehicle has a drive train connected to one or more drive wheels of the vehicle. The motive power system has an electrical motor having a motive power output connection for attachment to the drive train. A first heat exchanger has thermal connection to the electrical motor to remove heat from the electrical motor, the first heat exchanger employing a coolant fluid. A second heat exchanger is in thermal contact with the coolant fluid and with an ambient atmosphere for removing heat from the coolant fluid.

The invention discloses a less-rare-earth multi-excitation-source double-stator flux-switching memory motor, which belongs to the technical field of motor body design and operating principles. Coaxial outer stators, rotors and inner stators are sleeved together in turns from outside to inside to compose the memory motor, wherein a radial air gap exists between the outer stators and the rotors, the rotors and the inner stators, the outer stators are composed of armature core teeth, fault-tolerant teeth and stator yokes, and the rotors are composed of a rotor support, a magnetic silicon steel block and a magnetic insulation block, and meanwhile, the inner stators are composed of the inner stator core and a combined permanent-magnet cell block. The double-stator structure of the motor realizes the separation of armature winding and permanent magnet and solves the problem that multiple excitation sources inside the traditional flux-switching permanent magnet motors restrain each other, thereby easily increasing motor power density and torque density. The memory motor maintains high air-gap flux density and ensures of the motor power density and the torque density, meanwhile, the consumption of rare-earth permanent-magnetic materials is effectively lowered. On the other side, the memory motor can realize flexible adjustment of a motor air-gap field and expand the range of speed operation.

The invention discloses a magnetism gathering passive rotor transverse magnetic flux single-phase motor, and belongs to the transverse magnetic flux motor technology field. The single-phase motor comprises a stator composed of C-shaped stator iron cores and C-shaped permanent magnets, a rotor composed of an L-shaped rotor iron core and a rotor annular magnetic conductive structure, an annular armature winding. The C-shaped stator iron cores and the C-shaped permanent magnets are arranged alternatively in the circumference, and the C-shaped permanent magnets magnetize in the circumferential direction and the magnetization directions of two adjacent C-shaped permanent magnets are opposite. The annular armature winding is wound in the recessed groove formed after the C-shaped stator iron cores and the C-shaped permanent magnets are arranged alternatively. Grooves for insertion of L-shaped rotor iron cores in uniform distribution are formed in the rotor annular magnetic conductive structure. The C-shaped permanent magnets provide an effective magnetomotive force when a main excitation path formed among the rotor, the air gap and the stator goes through the yoke section of the rotor, and the permanent magnet utilization rate is raised.

The invention discloses a wind turbine simulator which comprises a prime motor system and an upper computer, wherein the prime motor system comprises a frequency converter, a three-phase asynchronous motor and a reduction gearbox; and the upper computer comprises a data acquisition card, an industrial control computer, a rotating speed encoder, an anemometer and wind turbine simulation software. In each working cycle period of the wind turbine simulator, the upper computer acquires the rotating speed and wind speed signal, calculates the output reference torque of the prime motor system through the wind turbine simulation software and transmits the output reference torque to the frequency converter in the prime motor system; and the frequency converter controls and adjusts the output mechanical torque of the reduction gearbox through the torque. Aiming at the output characteristics that the conventional wind turbine simulator based on the three-phase asynchronous motor hardly realizes low rotating speed and high torque, the invention provides the wind turbine simulator applicable to testing of a direct driving type wind generating set.

The invention discloses a slotless motor for an implantable axial flow blood pump. The slotless motor comprises a stator iron core, a stator winding, a rotor rotating shaft and a rotor permanent magnet. The slotless motor is characterized in that the stator iron core is formed by axially punching a circular silicon steel sheet, the rotor permanent magnet is made of a permanent magnetic material and is supportive of radial magnetizing, a coil of the stator winding is positioned between the stator iron core and the rotor rotating shaft, the stator winding is pasted on the inner wall of the stator iron core which is cylindrical, and the stator iron core is of a tooth-slotless structure. A direct-current brushless slotless structure is adopted, so that tooth-slot torque is eliminated, and copper loss is lowered. A triphase winding is divided into two layers of structures, copper wires at the end are arranged regularly, and thickness is consistent with that of a central portion, so that radial thickness of the end of the motor is reduced. High-heat-conductivity epoxy resin is used to fix the stator winding, so that the problem that the coil generates heat is solved effectively, the motor winding is fixed, and electromagnetic vibration and noise are avoided.

A 5-phase permanent magnetism motor short circuit fault tolerance control method based on a power constant principle belongs to the multi-phase fault tolerance permanent magnetism motor field, and solves the problems that a common 5-phase PMSM motor is poor in a motor torque output capacity and large in torque fluctuations when one phase of the winding has short circuit failure; the method can adjust the current of other non-short circuit phase when the motor has end short circuit fault, thus keeping the output power of the motor unchanged; when the motor has switch tube short circuit faults,the switch tubes of same positions of opposite bridge arms are conducted, and the current of other non-short circuit phase is adjusted, thus keeping the output power of the motor unchanged; the methodcan weaken the influences on the motor by short circuit faults of inverter switch tubes, thus reducing the subsequent fault tolerance control difficulty.

The invention provides a combined permanent magnet brushless motor stator and a manufacturing method thereof. A stator core is formed by a tooth part iron core formed by winding and a yoke part iron core, the tooth part iron core is located inside, the yoke part iron core is located outside, an inner circular surface of the tooth part iron core has no notch, a winding is placed into a groove froman outer circular surface or is wounded tooth by tooth, a tooth part winding is sleeved in the yoke part iron core to form a stator assembly after being manufactured, the invention is suitable for a fractional slot winding is also suitable for a distributed winding, the iron core has no slot and almost has no cogging torque, the motor running performance is good, the material utilization rate is high, the design is optimized and flexible, the motor efficiency and specific power are easy to improve, and the automatic production is easy to achieve.