90results about How to "Increase electromagnetic torque" patented technology

The invention discloses a starting method of a brushless, position sensor- free DC motor based on current feedback. The method comprises the steps as follows: a rotor is pre-positioned; the direction changing and the current converting are carried out; a preset voltage value is calculated according to a pressure-raising curve and is output in the form of PWM; the direction changing and the current converting are carried out when detection shows that a phasing current value I exceeds a predetermined value IH, and the preset voltage value in the next step is calculated at the same time according to the pressure-raising curve; and an electric motor is switched over to closed-loop operation when the current converting frequency is greater than the predetermined value, that is, rotational speed is high enough to obtain a back-EMF signal. Based on the real-time detection on the starting current, the technical proposal of the starting method obtains better starting performance compared with a traditional three-step starting method, ensures the stability and controllability of Delta during the whole accelerating process, leads the starting current to be more stable, enables the accelerating process to be smoother, automatically reduces the rotational speed and the Delta so as to obtain greater electromagnetic torque without desynchronizing when meeting with load disturbance, and does not need to add extra hardware or timers, thereby being simpler and more reliable.

The invention discloses a novel speed regulating system suitable for driving an electric automobile, which comprises the following steps: collecting phase currents iA, iB and exciting current if from an HESM (hybrid excitation synchronous machine) motor main circuit; collecting a real-time rotating speed nr from the HESM motor; obtaining d-q-axis currents id and iq after transforming the collected phase currents; comparing d-q-axis currents id and iq respectively with d-axis reference current idref and q-axis reference current iqref obtained from a current distributer and carrying out PID (proportion integration differentiation) operation, carrying out a reverse Park transformation and a space vector voltage pulse width modulation and outputing a pulse signal to control conduction and disconnection of a power tube corresponding to a armature driving module, and outputing the exciting current if and the exciting reference current ifref through an exciting driving signal generating module to control conduction and disconnection of the power tube corresponding to the exciting driving module, wherein the HESM motor adopts a dual-stator structure, an armature winding is arranged on an outer stator, and an inner stator is provided with an exciting winding; the motor rotor is configured as a claw pole shape, a permanent magnetic steel and a magnetizing iron core are in staggered arrangement on the claw pole, and the area rate of the permanent magnetic steel to the magnetizing iron core is 2:1.

The invention provides a controllable weak magnet technology combining a permanent magnet motor magnetic circuit structure and vector control. The multipolar special rotor magnetic circuit structure of a rare-earth permanent magnet synchronous motor in a system can perform the magnetism regulating function, the controllable weak magnetism technology can be realized by the method that a controller uses a software control algorithm to conduct the vector control. The magnetic pole magnetic circuit of the rotor of the motor is designed into a permanent magnet embedded structure with salient pole effect and magnetic permeability of the magnetic circuit of an axis d more than the magnetic permeability of the magnetic circuit of an axis q; a current dividing magnetic circuit is arranged for facilitating the weak magnetic timing. A controller uses the software control algorithm to conduct space-voltage vector control, controls the direct axis current Id and the alternating axis current I q respectively, and implements large-scale weak-magnet speed expansion of the permanent magnet motor. The system has large practical value on the tractor vehicle driven by the electric force.

The invention discloses a driving device for controllable flux permanent-magnetic synchronous motors with built-in composite rotors. The driving device comprises a controller and a controllable flux permanent-magnetic synchronous motor with a built-in composite rotor, as well as a position sensor which is connected with an output shaft of the motor and is used for outputting absolute position signals of permanent-magnetic field space of the motor rotor, wherein the position sensor is connected with the controller through a multicore cable. The driving device is specially used for controlling the controllable flux permanent-magnetic synchronous motor with the built-in composite rotor, realizes the wide-range high-performance speed regulation of the controllable flux permanent-magnetic synchronous motor with the built-in composite rotor, and has the advantages of little stator copper loss and safety in use.

The invention provides a high-efficiency and large-torque disk type switching magnetoresistive motor. The motor comprises a stator and a rotor, wherein both the stator and the rotor are in the shape of a yoke type round disk and comprise round disks and iron cores formed on the round disks; an integrated stator winding is wound on the iron core of the stator; and narrow magnetism isolating grooves which are arranged at intervals are radially formed in the iron core of the stator. The motor is simple in structure, high in efficiency and flexible in control method, can realize high-efficiency stepless speed regulation, and is very applicable to the application occasion requiring a short shaft, thin mounting, or low speed and large torque.

The invention discloses a straight-skewed composite stator winding slotless motor for an artificial heart pump and an optimization method. The straight-skewed composite stator winding slotless motor for the artificial heart pump comprises a rotation shaft located in the center, and a rotor permanent magnet, a straight-skewed composite winding and a stator iron core sequentially surrounding the rotation shaft from inside to outside, wherein an air gap is formed between the rotor permanent magnet and the straight-skewed composite winding; and the edge of the straight-skewed composite winding is flush with that of the stator iron core. The straight-skewed composite stator winding slotless motor for the artificial heart pump has the beneficial effects that after the straight-skewed composite winding is adopted, the electromagnetic torque of the motor is increased and the harmonic winding coefficient is reduced; the stator has a simple structure; and in comparison with the traditional motor structure, the stator has a slotless structure, the processing and the manufacturing are relatively simple, the cogging torque is eliminated, and copper loss is reduced.

The invention relates to the field of mechanical transmission, and is a monopole magnet rotating speed adjustable cage type magnetic coupling. In the invention, the copper disc uses a cage type copperdisc, all the fan-shaped grooves generate fan-shaped ring current around, the generated eddy current loss is small and the transmission efficiency is high, the fan-shaped grooves of the cage type copper disc and the small bumps on the surface of the yoke are in interference fit, and the small bumps of the yoke modulate the magnetic field, thereby further increasing the electromagnetic torque of the coupler. The coupler provides three speed adjustment methods that the first is to adjust the air gap between the copper disc and the permanent magnet disc through an axial moving device, the secondis to change the rotation angle of the rotating permanent magnet by fixing the air gap to further adjust the head-on area between a conductor disc and the permanent magnet disc, and the third is to use the composite speed adjustment of the air gap between the two disks in axial movement and the rotating permanent magnet, so that the coupler can meet different degrees of speed adjustment requirements.

The invention relates to a motor rotor, a motor and an electric vehicle. The motor rotor comprises a rotor core with rotor punching sheets and magnetic steel groove sets which are arranged on the rotor punching sheets at intervals in the circumferential direction, wherein a first magnetic steel groove and a third magnetic steel groove in each magnetic pole groove set are arranged into structures which are respectively symmetrical about the radial center line along the circumferential direction; the pair of second magnetic steel grooves are symmetrically arranged on the two sides of the first magnetic steel groove and the third magnetic steel groove at intervals relative to the radial center line; the pair of second magnetic steel grooves incline inwards in the radial direction in the direction close to each other; the third magnetic steel groove is located on the inner side of the first permanent magnet at an interval in the radial center line direction; the inner end of the second magnetic steel groove and the third magnetic steel grooves are oppositely arranged at an interval in the circumferential direction; and in the radial center line direction, the first outermost end of thethird magnetic steel groove is flush with the second outermost end of the second magnetic steel groove or located on the outer side of the second outermost end. Therefore, the total torque of the motor can be improved and the strength of the rotor punching sheet is improved.

The invention relates to a high-torque motor comprising a mover and a stator assembly. The mover and the stator include magnetic conductive parts; a plurality of permanent magnets are arranged at the stator and/or mover; and a gap is formed between the mover and the stator. At least the parts of the magnetic conductive parts are made of high-magnetic flux density materials. According to the motor, at least the parts of the stator magnetic conductive part and the mover magnetic conductive part include high-magnetic flux density magnetic-conductive parts; and the torque is improved by increasing the magnetic field intensity, so that problems caused by utilization of a reducer by the motor can be solved.

The invention discloses a rotor of an electromotor. The rotor of the electromotor comprises a rotor core and multiple sets of permanent magnets, wherein the multiple sets of permanent magnets are buried in the rotor core. Each set of permanent magnets comprise multiple permanent magnet layers which are mutually arranged in the radial direction of the rotor core at intervals. The permanent magnet layer, closest to the surface of the outer circumference of the rotor core, of the multiple permanent magnet layers is a ferrite permanent magnet layer. The other permanent magnet layers of the multiple permanent magnet layers are rare earth neodymium ferrum boron permanent magnet layers. By the adoption of the rotor of the electromotor, the reluctance torque and the electromagnetic torque of the electromotor can be increased, efficiency of the electromotor is increased without increasing cost of the electromotor, and the problems of noise and vibration deterioration of the electromotor can not be caused. Besides, operating reliability of the electromotor can also be guaranteed, and the electromotor can also be stably operated under high frequency.

The present invention discloses a claw pole disc asynchronous electric motor and relates to an electric motor. The claw pole disc asynchronous electric motor comprises a rotor component and a stator component. A claw pole magnetic pole and an axial motor air gap are adopted by the motor. Capacitor phase shifting start is adopted, a fixed rotation direction is set, and a working winding coil and astarting winding coil are shared. The motor has the advantages of simple manufacturing process, low cost and a small number of winding coils of a claw pole motor with a large number of magnetic polesand the advantages of a large electromagnetic torque and a good motor heat dissipation condition of a disk motor, and the motor can be widely applied to small low-rotation-speed electric motors of anelectric valve actuator, a medical instrument and precision transmission.

The invention discloses a consequent-pole motor, which comprises a rotor and a stator sleeved outside the rotor, wherein the rotor comprises a plurality of permanent magnetic poles uniformly distributed at intervals in the peripheral direction of the rotor; the inner peripheral edge of the stator is provided with a plurality of stator teeth in the peripheral direction; the permanent magnetic poleof the rotor comprises a first permanent magnet installing groove and a second permanent magnet installing groove from outside to inside in the radical direction of the rotor; a first layer of permanent magnet is arranged in the first permanent magnet installing groove; a second layer of permanent magnet is arranged in the second permanent magnet installing groove. The permanent magnets in multilayer distribution are used; the magnetic resistance torque of the motor can be improved, so that the electromagnetic torque of the motor can be improved.

The invention discloses an optimal torque angle control system of a built-in permanent magnet synchronous motor. A difference value obtained after comparison of a motor rotating speed and a given rotating speed is input to a rotating speed loop control module to obtain given current i<q phi><*>, the given current i<q phi><*> is input to a phi controller, the phi controller outputs an optimal torque angle phi, a new rotor position angle theta' is obtained by adding the optimal torque angle phi and a motor rotor position angle, and the new rotor position angle theta' is input to a 2r/2s coordinate transformation module and a 2s/2r coordinate transformation module. The phi controller is composed of a band-pass filter, a low-pass filter and an integral controller, a high-frequency signal is input to the phi controller, and then the given current i<q phi><*> contains a high-frequency signal delta<phi>. The optimal torque angle is obtained by inputting the high-frequency signal under the control condition that d-axis given current is zero, the optimal torque angle is compensated to the position angle to obtain maximum electromagnetic torque without the influence of operation conditions and motor parameters, and high robustness and dynamic performance are achieved.

The invention relates to a double-armature winding superconducting motor which comprises a superconducting rotor system, a stator system and a refrigerating system, wherein the superconducting rotor system comprises a superconducting exciting winding, a superconducting coil support, a rotor support and a rotating shaft; the refrigerating system comprises a double-layer Dewar; the stator system comprises a peripheral armature winding, a peripheral stator iron yoke, an internal armature winding and an internal stator iron yoke; the rotating shaft is externally sheathed on and connected with the rotor support; the Dewar is arranged on the rotor support; the outer wall of the Dewar is fixed on the rotor support; the superconducting coil support is fixed in the Dewar and passes through one end of the Dewar; the superconducting exciting winding is fixed on the superconducting coil support in the Dewar; the peripheral armature winding and the internal armature winding are respectively arranged at the outer side and the inner side of the outer wall of the Dewar; the peripheral stator iron yoke is arranged at the outer side of the peripheral armature winding; the internal stator iron yoke is arranged at the inner side of the internal armature winding. The double-armature winding superconducting motor fully utilizes the strong magnetic field generated by the superconducting exciting winding through the double armature windings so as to further increase the power density of a superconducting motor.

The invention provides a high-power density electric motor with characteristics of axial and transverse magnetic fields. The high-power density electric motor is a permanent magnet motor which is of a disk type structure and composed of a stator, a rotor, an end cap, a shaft, a stator bearing and an end cap bearing. The rotor is arranged on the shaft, the two ends of the shaft are respectively mounted with the stator bearing and the end cap bearing; the stator bearing is mounted in a stator bearing chamber, the end cap bearing is arranged in an end cap bearing chamber; the stator and the end cap are fixed together through a through hole on a magnet ring at the outside of the stator and a screwed hole on the end cover by using a screw. The high-power density electric motor of the inventionimproves the structure of the traditional electric motor and the placement of an armature winding, so that the end of the armature winding can also be involved in electromechanical energy conversion of the electric motor; and as a result, power density and overall performance of the electric motor are improved.

The invention discloses a synchronous reluctance motor rotor, which comprises an iron core. A circular hole is formed in the middle of the iron core; n parts are uniformly arranged on the iron core, and n is the same as the number of poles of the motor; each part is sequentially provided with a first layer of air magnetic barrier, a second layer of air magnetic barrier and a third layer of air magnetic barrier with radians from inside to outside; magnetic bridges are arranged in the middle positions of the first layer of air magnetic barrier and the second layer of air magnetic barrier; and agroove is formed in the outermost part of each part. According to the invention, the problems of serious motor leakage inductance, low mechanical strength, quite small salient poles, insufficient electromagnetic torque and the like are solved.

The invention provides a high-power density motor with a multifunctional magnetic field, which comprises a stator, a middle rotor, a left rotor, a right rotor, a left bearing, a right bearing and a hollow shaft, wherein the stator is fixed on the hollow shaft; the left and right rotors are positioned on the left and right sides of the stator respectively and connected with the hollow shaft through the left bearing and the right bearing respectively; the middle rotor is positioned between the left and right rotors and fixedly connected with the left and right rotors respectively; and the hollow shaft is fixed with other outside devices. The high-power density motor is an outer rotor permanent motor characterized in axial, radial and transverse magnetic field motors. The structure of the traditional motor and the placement mode of armature winding are improved and the end part of the winding can also be participated in the electromechanical energy conservation of the motor, so that the power density and the overall performance of the motor are improved.

The invention provides a rotor assembly and an alternating pole motor. The rotor assembly includes a rotor core (1), wherein the rotor core (1) includes permanent magnetic poles and alternating polesalternately arranged in the circumferential direction, the permanent magnet poles include mounting grooves (2), permanent magnets (3) are mounted in the mounting grooves (2), polarities of the permanent magnets (3) facing the outer circumference of the rotor core (1) are of the same polarity, second air grooves (5) are respectively disposed at both ends of the mounting grooves (2), first air grooves (4) are disposed on two sides of magnetic pole center lines, the first air grooves (4) are located on a side between the second air grooves (5) and the magnetic pole center lines adjacent to the second air grooves (5), an acute angular tip is formed between a radial outer sidewall of the first air grooves (4) and a first groove wall adjacent to the magnetic pole center lines, and the acute angular tip is gathered toward the magnetic pole center lines. The rotor assembly is advantaged in that the electromagnetic torque drop caused by the excessive magnetic flux area of the permanent magnetscan be effectively suppressed, and motor performance is improved.

The invention discloses a stator and rotor dual-permanent-magnet excitation harmonic motor. A rotor structure of the motor is arranged in a stator structure, and the stator structure comprises magnetism adjustment teeth which are annularly arranged between stator teeth and rotor teeth and an annular magnetic bridge which is arranged between the magnetism adjustment teeth and the stator teeth and is used for connecting the magnetism adjustment teeth with the stator teeth to form a whole; furthermore, a magnetism adjustment slot for mounting a stator permanent magnet is formed between every two adjacent magnetism adjustment teeth; the stator teeth and stator yokes are detachably assembled. The invention provides a novel permanent magnet motor of which a stator and a rotor are provided with permanent magnets; the motor can be improved in the torque/the power density through excitation of the two permanent magnets on the stator and the rotor, so that the motor is extremely high in application potential in a low-speed and high-torque electrical transmission system.

The invention discloses a consequent-pole motor and a compressor with the same. The consequent-pole motor comprises a rotor; the rotor is prepared from a soft magnetic material; one slot groups or more are arranged on the rotor; each slot group is provided with three layers of slots in a radial direction; the slots are divided into first-layer slots, second-layer slots and third-layer slots from the peripheral edge of the rotor to the axle hole of the rotor; permanent magnets are mounted on two layers of slots of each slot group; polarities of the permanent magnets, which face the outer peripheral edge of the rotor, are the same polarities. The motor designed by the invention adopts a multi-layer slot structure, but the permanent magnets are not mounted in all of the slots, so that an inductance Lq of a q axis of the motor can be obviously improved, a difference value of Lq and Ld is increased, an electromagnetic torque of the motor is improved, demagnetization resistance of the rotoris obviously improved, and torque fluctuation is weakened.

The invention relates to an iron shell and tooth permanent magnet spherical motor cogging torque analysis method. The cogging torque generated when one magnetic pole is obtained through a finite element, then the cogging torque generated by other magnetic poles is obtained through space coordinate rotation transformation, all the cogging torques are superposed to obtain the total cogging torque, and therefore the corresponding relations between the rotor space position and the cogging torque are obtained.

The invention discloses a rotor of a motor, a driving motor and a vehicle. The rotor comprises a rotor core; a plurality of first permanent magnets and a plurality of second permanent magnets which are installed on the rotor core, wherein the plurality of first permanent magnets extend along the radial direction of the rotor core and are distributed at intervals along the circumferential directionof the rotor core, and two second permanent magnets are arranged between two adjacent first permanent magnets; the radial inner ends of the two second permanent magnets located between every two adjacent first permanent magnets are close to each other, the radial outer ends of the two second permanent magnets located between every two adjacent first permanent magnets are far away from each other,the sectional area of each first permanent magnet is S1, and the sectional area of each second permanent magnet is S2. According to the rotor provided by the embodiment of the invention, the spoke type permanent magnet formed by the first permanent magnet and the V-shaped permanent magnet formed by the two second permanent magnets are designed in a composite mode, so the rotor has the advantagesof being small in magnetic flux leakage, good in demagnetization resistance, large in air gap flux density and the like, the optimal matching of permanent magnet torque and reluctance torque is achieved, and the motor is high in electromagnetic torque and good in torque performance and weak magnetic performance.