558results about How to "Reduce copper consumption" patented technology

A permanent magnet biased axial magnetic bearing is composed of a stator and a rotor, the stator is composed of four group of stator cores, a permanent magnet and windings, the four group of stator cores compose eight stator poles on circumference direction and are put along +X, -X, +Y, -Y direction, each stator core pole is winded with a winding. An axial magnetic gas gap is formed between the stator and the rotor, an arc permanent magnet is put between two stator core poles in each group of stator core, and a second gas gap is formed on the radial outside by the permanent magnet and two stator core poles of each group of stator core. The invention can realize the axial movement and radial twist control for the magnetic suspension rotor by the four group of stator cores distributed in +X, -X, +Y, -Y direction, and can greatly reduce the axial size of the system. The axial magnetic bearing also has the advantages of low power consume, reliable property and convenient control.

The invention relates to a composite vector control method for a permanent magnetic synchronous wind generator, comprising the following steps of: controlling the size and the direction of a stator current vector value according to a mathematical model of the permanent magnet synchronous wind generator by utilizing the vector control method, and establishing a composite vector control strategy of the permanent magnet synchronous wind generator based on stator current orientation. Through the stator current orientation, a maximum torque current ratio control mode is adopted between the cutting speed and the turning speed of the generator so as to improve the generated power of a system; and a weak magnetic control mode with maximum power output is adopted between the turning speed and the limiting speed, therefore, the system efficiency is improved, and the system stability is ensured.

The invention discloses a mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor and a winding switching magnetism-weakening control method thereof. The mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor comprises a salient rotor and a stator, wherein the stator contains stator cores, aluminium-nickel-cobalt permanent magnets, neodymium-iron-boron permanent magnets, centralized armature windings and pulsed magnetism-adjusting windings; iron core edges of two adjacent outer U-shaped units and tangentially-magnetized long-stripped neodymium-iron-boron permanent magnets form a first permanent magnetic pole, while the circumferentially-inward (outward) and parallel-magnetized V-shaped embedded aluminium-nickel-cobalt permanent magnets and inner U-shaped units form a second permanent magnetic pole; mixed magnetic poles are in alternating polarity distribution; when the motor runs at a low speed, the pulsed magnetism-adjusting windings are in direct-current pulsed working state, while in a high-speed weak-magnetism area, the pulsed magnetism-adjusting windings are converted into alternating-current armature windings. Requirements on performance in a low-speed area and in the high-speed area can be met at the same time; influence of an armature reaction field on the aluminium-nickel-cobalt permanent magnets with low coercivity is small; the utilization rate of permanent magnetism, the torque density, and the reliability of system operation are high.

The invention discloses a double-stator disc type mixed excitation motor which comprises two stators, a permanent magnet, a three-phase concentrated armature winding, a single-phase concentrated excitation winding and a rotor. The stators and the rotor are arranged coaxially, and the rotor is arranged between the two stators. The permanent magnet, the armature winding and the electric excitation winding are all located on the stators. The rotor is free of the permanent magnet or the windings and simple in structure. An air-gap magnetic field is formed by an electric excitation magnetic field generated by the electric excitation winding and a permanent magnetic field generated by the permanent magnet, and adjusting of the air-gap magnetic field is achieved by changing electric excitation current. The motor structurally reserves the characteristics of a disc type magnetic flux switching permanent magnetic motor of being compact, simple and suitable for high-speed operation, can achieve a mixed excitation function without increasing the motor size additionally and guarantees good torque output capacity and high power density. The motor is small in axial size and suitable for strict and thin type installing in places of a hub driving motor for electromobile and the like.

The invention provides an axial permanent magnet assisted radial reluctance high-speed motor with a hybrid cooling structure, and relates to the technical field of motors. The motor provided by the invention is provided with an air cooling and water cooling structure on the basis of a dual group 6/4-pole switched reluctance motor structure. The motor comprises a casing, a front end cover, a rear end cover, a rotor and a stator, and is characterized in that an inter-tooth slot of the stator and the rotor form a cooling air channel, each end cover is provided with air discharging holes, the casing is provided with a cooling air inlet, a cooling water inlet pipe opening, a cooling water outlet pipe opening and a circumferential ring-shaped air guiding channel, the back of a ring yoke of the stator is provided with a spiral water channel pipe, and two ends of the rotor are provided with self-cooling fans respectively. According to the invention, a cooling structure combining the air cooling stator and the water cooling stator is adopted, and a water cooling function and an air cooling function are opposite in direction and complementary in cooling region, so that the stator and the rotor of the motor are effectively enabled to be reduced in temperature, a problem of difficult heat dissipation of the motor under a high-speed operating condition is avoided, thus long-term safe and stable running of the motor is ensured, and the service life of the motor is effectively prolonged.

The invention provides one megawatt wind motor power network integration alternator, which comprises wind motor and low voltage electrical net or lift transducer and at least two basic transducer power units with each one connected to form power main circuit, wherein, the basic transducer power unit comprises motor side three-phase PWM total transducer and PWM side integration transducer; power transducer main circuit output end connects low voltage network or lift transducer; the input end of transducer main circuit is connected to wind motor.

The invention discloses a short-circuit fault-tolerant vector control method for an embedded hybrid magnetic material fault-tolerant cylindrical linear motor. The short-circuit fault-tolerant vector control method comprises the following steps: building a five-phase embedded hybrid magnetic material fault-tolerant cylindrical linear motor model; compensating normal thrust missing caused by a short-circuit fault phase and suppressing a thrust ripple caused by phase short-circuit current with non-fault phase current of the motor; and obtaining expected phase voltage by adopting a series of coordinate conversion and voltage feed-forward compensation strategies, and achieving a fault-tolerant vector control after the phase short-circuit fault of the motor by a zero-sequence voltage harmonic injection-based CPWM modulation mode. According to the short-circuit fault-tolerant vector control method, the motor can suppress the thrust ripple of the motor under the condition of a phase short-circuit fault-tolerant operation; more importantly, the dynamic property, the steady-state performance and the properties in a normal state are consistent; the switching frequency of a voltage source inverter is constant; a CPU is low in overhead; and a natural coordinate system only needs to counterclockwise rotate a certain angle in any phase short-circuit fault, so that the motor fault-tolerant operation can be achieved.

The invention discloses a one-phase open-circuit fault-tolerant direct thrust control method for a five-phase permanent magnet linear motor. Firstly, a Clark transform matrix and an inverse matrix thereof are derived based on fault-tolerant phase current. On the above basis, a stator flux linkage on alpha-beta is derived, a stator virtual flux linkage is defined according to the requirements of acircular stator flux linkage trajectory, and thus the voltage compensation on alpha-beta is derived. The stator actual voltage on the alpha-beta is derived by a modulation function of a voltage sourceinverter, and voltage is combined with voltage compensation and stator current, and a stator virtual flux linkage and thrust are observed by a stator flux observer and a thrust observer. Then statorvirtual target votlage is calculated according to given thrust, a given stator flux linkage amplitude and the observed stator virtual flux linkage and thrust. Finally, the stator actual voltage is calculated by the voltage and the voltage compensation, and the motor is controlled by the voltage by the voltage source inverter. According to the method, a thrust fluctuation caused by a motor failureis suppressed, and more importantly, the dynamic performance and steady state performance are consistent with that in a normal condition.

The permanent magnetic offset mixed radial magnetic bearing with low power consumption features that it consists of stator and rotor with air gap in between. The stator includes 8 stator magnetic poles and they forms 4 pairs in both right and left ends and separately for positive and negative directions in X and Y directions. Each stator magnetic pole consists of stator magnetic pole core and stator winding on the core, and 4 stator core yokes are connected across between two stator cores each to constitute the 8 stator magnetic poles, with magnetic isolators being set between the stator core yoke for X direction and that for Y direction. The rotor includes rotation shaft, permanent magnet, magnetizing sleeve and rotor core. The present invention has separated permanent magnetic path and electromagnetic part, lowered control current and control power consumption, small volume and light weight.

The permanent-magnet offset outer rotor mixed radial magnetic bearing with low power consumption is composed of rotor iron core. Permanent-magnets, stator iron cores and excitation coils. Said invention also provides ther arrangement mode, between outer surface of stator iron core and inner surface of rotor iron core a certain gap is remained to form air gap, between two stator iron cores and permanent magnet a second air gap is formed. The permanent magnet utilizes stator iron core magnet poles to form offset magnetic field on X and Y directions.

The invention discloses a direct-axis magnetic field enhanced type wide-range speed control permanent magnet brushless motor for an electric automobile. A magnetic barrier fills each slot of a rotor, and the magnetic barriers are symmetrical relative to a centerline, i.e., a quadrature axis, of slot parts of the rotor; four sections of arc-shaped permanent magnet steel are fixedly embedded on each tooth part of the rotor, the four sections of arc-shaped permanent magnet steel are divided into an inner layer and an outer layer, two sections are arranged on each layer, the two sections of permanent magnet steel on each layer are the same in structure and are symmetrical relative to a centerline, i.e., a direct axis of the tooth parts of the rotor, the two sections of permanent magnet steel on the same layer do not run through each other and are not connected with each other, and an arc-shaped magnetic bridge is formed between the two sections of permanent magnet steel; a circle center of each section of permanent magnet steel is located on the diameter of the rotor; the direct-axis inductance of the motor is larger than the quadrature-axis inductance, so that the motor can adopt a control method with zero direct-axis current and can also adopt a direct-axis magnetic field enhanced control method during low-speed operation or startup, and can adopt a coordinated control method of direct-axis magnetic field enhancement and slight direct-axis magnetic field weakening during high-speed operation, and the speed control range is wider.

The invention discloses a segmented control method of permanent magnetic linkages of a stator permanent magnetic type memory motor. The method comprises following steps of S1, according to magnetization states of a permanent magnet, selecting k+1 permanent magnetic linkages including phipm (if0), phipm (if1), ..., phipm (if(k-1)), and phipm (ifk), wherein the phipm (if(k-1)) is larger than the phipm (ifj), and 1<=j<=k, calculating rotation speed omegaej according to direct current bus voltage Udc, the rated phase current In, and the quadrature axis inductance Lq(j) and the permanent magnetic linkage phipm (ifj) of the jth kind of magnetization state, and storing the permanent magnetic linkages of phipm (if0), phipm (if1) ..., phipm (if(k-1)), and phipm (ifk) and corresponding rotation speeds of omegae0, omegae1, ..., omegae(k-1), and omegaek into a speed-permanent magnetic linkage table, wherein the if is the magnetic field adjusting pulse; and S2, when the given rotation speed shown in the description meets the condition shown in the description, judging a magnetic field adjusting process of the permanent magnet by comparing the permanent magnetic linkage phipmo(if) and the permanent magnetic linkage phipm(ifj) corresponding to the rotation speed omegaej observed by the permanent magnetic linkage observer. According to the invention, speed adjusting range of the motor is enlarged, and effects on permanent magnetic linkage calculation accuracy imposed by motor parameters are reduced.

The permanent magnetic offset external rotor magnetic radial bearing features that it consists of rotor iron core, permanent magnet, stator iron core and exciting winding. Eight stator iron core magnetic poles distributed homogeneously in a circumference are wound with exciting winding; and four permanent magnets are embedded inside the stator iron core separately in the +X, -X, +Y and -Y directions to produce offset magnetic field in X direction and offset magnetic field in Y direction separately. Between the outer surface of the stator iron core and the inner surface of the rotor iron core, there is air gap. The permanent magnetic offset external rotor magnetic radial bearing of the present invention has the advantages of no coupling between the X direction permanent magnetic path and the Y direction permanent magnetic path, small size, low power consumption, reliable performance and easy control.

The invention discloses a magnetic flux switching type permanent magnet memory motor comprising an enclosure, a stator contained in the enclosure, a rotor (2) and a non-magnetic rotary shaft (8). The magnetic flux switching type permanent magnet memory motor is characterized in that the stator (1) is arranged at the outer part of the rotor (2); the rotor (2) is fixedly arranged on the non-magnetic rotary shaft (8) and is in a convex pole type; the rotor (2) comprises a rotor main body part and rotor teeth which protrude from the main body part to a direction which is far away from the center of the rotor; the stator comprises a stator iron core (1), a permanent magnet (3), a three-phase armature winding (4) and a pulse winding (5); the stator iron core (1) comprises a plurality of stator yokes and stator teeth (1.1) which protrude from the stator yokes to the direction of the center of the stator iron core; and the three-phase armature winding (4) is wound on the stator teeth (1.1). According to the magnetic flux switching type permanent magnet memory motor disclosed by the invention, a motor no-load gap magnetic field is adjustable, and the weak magnetism capability and the rotary speed operation speed of the motor are improved; and meanwhile, the torque and the power density of the motor are improved and the copper consumption of the motor is reduced.

The invention discloses a DC voltage control system of hybrid electric vehicle, comprising generator, electromotor, storage battery and control unit. The control unit controls the generator and electromotor and is connected with them. Generator and electromotor are connected with the storage battery in current. A voltage-increasing power supply circuit for increasing outputting voltage of storage battery to electromotor and a voltage-decreasing charging circuit for decreasing outputting voltage of generator or obtaining outputting voltage from vehicle kinetic energy to the storage battery when electromotor is used as regenerative braking are set between the electromotor and the storage battery. The control unit is used to control on-off and switch of the voltage-increasing power supply circuit and the voltage-decreasing charging circuit. Because voltage-increasing circuit is adopted storage battery can adopt low-voltage battery group so as to decrease battery system cost and cubage and achieve demands of low cost and mass production. Because power supply increasing voltage of electromotor is improved copper quantity for motor winding can be decreased greatly; motor size is decreased; consumption is decreased and efficiency is improved under the status of the same power.

The invention provides an electric vehicle hybrid excitation hub motor which is composed of a shaft, a hub, rotor poles, stator poles, two sets of armature windings, stator iron cores, excitation windings, permanent magnets and a hub cap. The fan-shaped stator iron cores are fixed in the middle of the shaft in a back-to-back way. The two sides of the stator iron cores are provided with the protruding stator poles. The rotor poles are fixed on the internal walls of the two end surfaces of the hub. One permanent magnet is clamped between every two stator iron cores which are aligned in a circumferential direction. A groove is arranged between the two opposite stator iron cores and used for embedded arrangement of the excitation windings. Each stator pole is provided with the armature windings in a winding way. Integration of the hub and a driving motor is effectively realized by the technology so that the size and the weight of a driving system can be reduced; the rotor has no permanent magnet or excitation winding so that the possibility of demagnetization of the permanent magnets caused by impact can be reduced; a permanent magnetic field can be enhanced by an electric excitation magnetic field at low speed so that high-torque output can be realized; and the permanent magnetic field can also be weakened at high speed so that high-speed weak magnetic control can be realized.