158results about How to "Increased torque output capability" patented technology

A current setting method for open-circuit fault tolerance control of a five-phase permanent magnet synchronous motor belongs to the field of motor control. The current setting method settles a problem of low motor torque output capability in fault tolerance control of routine five-phase permanent magnet synchronous motor open-circuit faults. The current setting method is characterized in that a five-phase permanent magnet synchronous motor is powered by a five-phase full-bridge or five-phase six-bridge inverter; on condition that one-phase, two-phase or three-phase winding open-circuit fault of the motor occurs, for making the motor output a highest smooth torque, maximizing of amplitude of a forward rotation component is required under a precondition that a forward rotation component in a synthetic magnetomotive force is zero; and a positive circular rotating magnetic field with highest amplitude is generated in an air gap. The input current of each residual winding phase is adjusted. Compared with a traditional winding open-circuit fault tolerance control method, the current setting method can improve torque output capability of the five-phase permanent magnet synchronous motor on the condition of winding open-circuit fault, realizing higher output torque and smaller torque fluctuation.

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.

The invention discloses a vector type permanent magnetic brushless motor control method. When a motor starts, by use of a constant-torque zone current closed-loop control method, a permanent magnetic brushless motor is controlled, when a PWM duty ratio output by an electric current loop proportional integral controller reaches a set threshold, by use of a constant-power weak-magnetic zone torque closed-loop control method, the permanent magnetic brushless motor is controlled; and in the constant-power weak-magnetic zone torque closed-loop control method, when a weak-magnetic control advanced conduction overlap angle delta theta FW output by a torque ring proportional integral controller is lower than a set threshold, by use of a constant-torque zone current closed-loop control method, the permanent magnetic brushless motor is controlled.

The invention relates to an automobile engine cooling fan control system based on a four-phase double-wire winding brushless DC motor. The automobile engine cooling fan control system comprises the four-phase double-wire winding brushless DC motor, a microcontroller, and a drive module, a communication module, simulated signal detection, a fault secure circuit, a PC machine and a power supply module connected with the microcontroller. An output control signal of the microcontroller is connected to the motor through the drive module so as to control the motor. The simulated signal detection is connected with the motor and detects a back electromotive force signal of the motor; and then a simulated detection circuit transmits the detection results to the microcontroller so as to form a detection loop. The fault secure circuit is connected with the simulated signal detection circuit and the microcontroller, and the microcontroller is operated according to a relevant output signal of the detection circuit so as to protect the system. The power supply module is connected with the microcontroller and supplies a working voltage. The microcontroller is connected with the PC machine through the communication module. The control proposal of the invention has the advantages of low cost, high efficiency and high reliability, and is an optimal solution for the occasions requiring high reliability such as the field of automobile application.

The invention provides a permanent-magnet rotor deflection-type three-degree-of-freedom motion motor, which relates to the technical field of permanent-magnet rotor motors. The motion motor is characterized in that magnetism isolating sheets and permanent magnets consisted of non-magnetic-conduction materials are distributed on the outer side of the inner core of the rotor. N-poles and S-poles are distributed in a staggered way and the outlines of the permanent magnets are spherical. At least two layers of magnetic pole iron cores are provided on the rotor of the periphery. Stator magnetic pole loops are provided on the magnetic pole iron cores. An output shaft is rigidly connected with center of the stator, the center of an outer housing overlaps with center of the rotor and the rotor is supported by a circular ball bearing fixed on the stator. The stator is provided with a transducer for detecting the position and the speed of the rotor so as to realize closed-loop control of the motor. The motion motor of the invention solves the problems of the three-degree-of-freedom motion motor in the prior art, including heavy abrasion, poor torque output capacity and the like. The motion motor of the invention is relatively simple in structure, easy to control, high in mechanical integration level, small in abrasion, strong in torque output capacity, and excellent in static and dynamic performance. In addition, the motion motor can realize suspension control.

The invention discloses a segmented rotor consequent pole permanent magnet motor. The segmented rotor consequent pole permanent magnet motor comprises two segments of rotors, wherein the two segments of rotors are connected in an axial direction of the rotors, a surface of each segment of rotor is provided with multiple convex poles, grooves among the adjacent convex poles are embedded with permanent magnets, a convex pole and permanent magnet alternating arrangement structure is formed on surfaces of the rotors, the shape of the permanent magnets is in matching with the shape of the grooves, each surface of the permanent magnets and each surface of the grooves realize tight contact, upper surfaces of the permanent magnets and upper surfaces of the convex poles are arc-shaped surfaces, radian of the upper surfaces of the permanent magnets and radian of the upper surfaces of the convex poles are identical, all the upper surfaces of the convex poles and all the upper surfaces of the permanent magnets form an integral cylindrical surface, the permanent magnets on the two segments of rotors circumferentially offset for a half electric period angle, magnetizing directions of the permanent magnets on one segment of rotor are identical, and magnetizing directions of the permanent magnets on different segments of rotors are opposite. The segmented rotor consequent pole permanent magnet motor is advantaged in that disadvantages of a traditional surface-mounted permanent magnet motor are solved, permanent magnet materials and protection sleeves are saved, and magnetization of an end portion of a rotation shaft can be avoided.

The invention provides an induction machine vector control method taking account of iron loss adopts dual closed-loop control of an outer speed loop and an inner current loop, wherein the outer speed loop adopts the rotational speed PI modulating control of a motor and outputs a torque current instruction value of the inner current loop; the inner current loop adopts torque current and field current PI modulating control; in the inner current loop, the torque current and the field current are respectively compensated; and the compensated torque current and field current components are led into the current PI regulation. The induction machine vector control method takes the influence of iron loss on the field orientation and the field intensity into consideration, and improves the field orientation accuracy and control performance of a traditional induction machine vector control method, particularly the speed operating precision in a weak magnetic region and the stability in current control.

The invention discloses a modularized flux switching permanent magnet (FSPM) motor, which is used for solving the problem of such a motor in which a permanent magnet is placed in a rotor. The motor comprises a stator and a rotor and adopts an inner rotor mode or an external rotor mode. The stator and the rotor are respectively a convexo-convex pole and slot structure. A magnetic module and a centralized armature winding are arranged on the stator; the magnetic module comprises one male concentrating flux iron core and one female concentrating flux iron core of the stator as well as a permanent magnet embedded in the stator; and the rotor is not provided with a permanent magnet and a winding. The motor has the beneficial effects that the structure is simple, compact and stable, and the volume is small; the windings are high in slot fullness, the resistance and the copper consumption are decreased and the efficiency is higher; the linear charge density, the torque output capacity and the power density are improved; the magnetic flux gathering effect exists, and the no-load air gap magnetic density is higher; and the armature reaction flux is vertical to the permanent magnet flux in space, and the stronger demagnetization-resisting capacity is ensured.

The invention discloses a disc type double-stator hybrid excitation motor. According to the hybrid excitation motor designed in the invention, based on the principle of magnetic field modulation, the combination of a disc type permanent magnet motor and an electric excitation system is realized. The hybrid excitation motor has the characteristics of high power density, high moment density, a short axial size and a compact structure and also has the advantages of flexible adjustment of an excitation magnetic field and a wide speed regulation range, and thus the hybrid excitation motor can be applied to the field of electric vehicle hubs. The motor comprises two stators and one disc type rotor. An excitation winding and an armature winding are respectively arranged at the stators at two sides, and a permanent magnet pole and a core pole are distributed on the rotor. By using the magnetic field modulation technology, the permanent magnet on the rotor and the excitation winding on an inner stator generate a magnetic field same with an armature winding pole pair number at an external air gap, and a permanent magnet pole and an iron pole are uniformly distributed on the rotor. By using the magnetic field modulation technology, the permanent magnet on the rotor and the excitation winding on the inner stator generates a magnetic field same with the armature winding pole pair number at the external air gap, and thus the electromechanical energy conversion is realized. The back EMF waveform is improved through the design of a multi-phase structure and a three-layer fractional-slot integrated winding, and the reliability and fault tolerance of the motor are improved at the same time.

A magnetic flux modulation dual-stator dual-electric port motor, including coaxially arranged and independent of each other: a first stator, a second stator, a freely rotatable magnetic modulation ring connected to a driving component for torque transmission, the first stator There is an air gap between the first stator and the second stator, and the magnetic modulation ring is set in the air gap between the first stator and the second stator or sleeved on the outside of the first stator and the second stator so that the first stator and the second stator The magnetic field generated by the two stators is modulated. The first stator is equipped with the first stator winding with the number of pole pairs P1, and the second stator is equipped with the second stator winding with the number of pole pairs P2. The magnetic modulation ring includes N magnetic permeable blocks arranged at intervals, and P1+P2=N, P1, P2, and N are positive integers. The magnetic flux of the present invention converges into the air gap between the stator and the magnetic modulation ring, which can improve the torque transmission capacity and transmission efficiency, and in the case of P1+P2=N, can realize the maximum torque transmission capacity, two sets of independent Stator windings allow flexible four-quadrant control.

The invention discloses a magnetization state selection and weak magnetic control coordinated control method of a stator permanent-magnet memory motor. The constant-power working range of the stator permanent-magnet memory motor is expanded by combining a weak magnetic control method under different permanent magnetization states. According to the method, different current allocation strategies are employed at different rotational speed zones, and the control performance of the motor is optimized; compared with a segmented permanent-magnetic flux control method, the method has the advantage that the torque output capability of the motor at the different rotational speed zones is improved; and meanwhile, under the constant load torque, the efficiency of the stator permanent-magnet memory motor at different rotational speed zones is improved by the method.

The invention discloses a segmented magnetic control method of an AC magnetic control memory motor. The segmented magnetic control method comprises the following steps of adding a magnetic control pulse module to a control system so as to achieve on-line regulation of motor flux linkage; selecting n target magnetic states during the running process of the motor, determining intersection points ofa corresponding T-N curve and a motor rotational speed corresponding to each intersection point; and determining the lowest magnetic level during the magnetic control process of the motor according toa relation between Psi<pm>/Ld and i<smax>, and only performing traditional armature current weak magnetism, wherein a permanent-magnet field is not weakened by magnetic control pulse any longer. In order to achieve optimal magnetic control effect, the rotor position at magnetic control initial moment and magnetic control pulse phase are reasonably allocated. Compared with a traditional weak magnetism expansion method, the segmented magnetic control method has the advantages that the direct-axis current component during the running process of the motor can be greatly reduced, the stator copperconsumption of the motor at a high-speed running zone is reduced, frequent on-line magnetic control of the permanent magnet is prevented, and the running efficiency of the motor and the practicability of the control system are improved.

The invention discloses a parallel type mixing-magnetic-material-based composite-rotor-contained magnetic flux switching motor. A non-magnetic-conductive rotating shaft, an inner rotor, a stator, and an outer rotor are installed successively and concentrically from inside to outside at a radial direction in a sleeving mode. The stator contains stator iron cores, mixed permanent magnet modules and three-phase armature windings; the three-phase armature windings are arranged between the adjacent stator iron cores; one mixed permanent magnet module is embedded into the middle of each stator iron core tightly and fixedly; and each mixed permanent magnet module is formed by seamless connection of an internal neodymium iron boron permanent magnet, a ferrite permanent magnet, and an external neodymium iron boron permanent magnet from inside to outside along the radial direction. On the basis of the stator-free yoke-type structural design, obvious series magnetic circuits of the adjacent permanent magnets are formed on the magnetic flux paths by combining the composite rotor, thereby avoiding a phenomenon of supersaturation of the stator tooth part and effectively improving the utilization rate of the permanent magnet. The stator tooth employs a non-equal-arc design, so that the total positioning moment on the composite rotor is reduced and thus an effect of reduction of torque pulsation is realized.

The invention discloses a rotor dual-side permanent-magnet type single-winding dual-stator vernier motor, relates to the field of a vernier motor and aims to solve the problems of small output torque and low permanent-magnet utilization ratio of a traditional vernier motor. A rotor is a cup-shaped rotor, the cup bottom is fixedly connected with a rotor output shaft, the cup body is arranged between an inner stator and an outer stator, N pairs of magnetic flux modulation units are arranged on the inner stator, in each pair of magnetic flux modulation units, the bottom of a modulation rod is fixed on the external circular surface of the inner stator, a three-phase armature winding is wound around the modulation rod, two modulation teeth are symmetrically fixed at the two sides of the top of the modulation rod, the distance between each adjacent two pairs of magnetic flux modulation units is the same as the distance between the two modulation teeth, the rotor is formed by laminating silicon steel sheets, slot positions are arranged on the upper surface and the lower surface of the rotor, permanent magnets are embedded into the slot positions, the permanent magnets at the upper part and the permanent magnets at the lower part are sequentially arranged in a staggered way, 2N stator teeth on the inner surface of the outer stator and the modulation teeth are different by a tooth pitch in spatial arrangement. The rotor dual-side permanent-magnet type single-winding dual-stator vernier motor has the advantages of large output torque and high permanent-magnet utilization ratio, and is applicable to the field such as an electric vehicle.

The invention discloses a magnetic field enhanced consequent-pole permanent magnet motor, comprising n rotor sections, wherein the n rotor sections are connected in sequence in the axial direction of a rotor, an annular permanent magnet magnetized axially is arranged between two adjacent rotor sections, and the magnetized directions of the adjacent annular permanent magnets are opposite; the n rotor sections are of the same structure, a plurality of salient poles are uniformly arranged on the surface of each rotor section, a permanent magnet is embedded into a groove between the adjacent salient poles, and an alternate arrangement structure of the salient poles and the permanent magnets is formed on the surface of the rotor; the magnetized directions of the permanent magnets on the surface of the same rotor section are same, and the magnetized directions of the permanent magnets on the surfaces of the adjacent rotor sections are opposite; a hollow cylindrical permanent magnet is arranged between the inner side of each rotor section and a rotating shaft, and the magnetized directions of the permanent magnets on the inner sides of the two adjacent rotor sections are opposite. The magnetic field enhanced consequent-pole permanent magnet motor overcomes the defects of a traditional surface-mounted permanent magnet motor, reduces the cost of a permanent magnet material, and enhances the output torque.

The invention discloses a synchronous electric main shaft acceleration strong magnetic control method for variable-load superhigh-speed grinding, and the method comprises the steps: obtaining a d-axis current expected instruction value and a q-axis current expected instruction value of a synchronous electric main shaft in a closed-loop manner, and obtaining voltage expected instruction values at all phases in a three-phase stationary coordinate system; enabling error signals between the voltage expected instruction values at all phases in the three-phase stationary coordinate system and the action value of voltages at all phases to serve as the control signals of power switch IGBTs at all phases, carrying out the vector control of the actual output currents of a PWM Inverter driver at all phases; continuously increasing the q-axis current expected instruction value, and reducing the d-axis current expected instruction value; and enabling the internal power factor angle beta of the motor to be reduced continuously. The method is good in motor torque characteristics, is high in grinding efficiency, is high in dynamic response of motor torque speed, is good in robustness, is high in grinding quality and precision, is small in motor current, can effectively prevent a controller from being saturate, prevents a motor from stalling and being out of control, is high in efficiency, and saves energy.

The invention discloses a built-in permanent magnet rotor structure of an axial flux motor. The built-in permanent magnet rotor structure comprises two rotor discs; each rotor disc comprises a rotor core with an annular cross section; each rotor core is formed by circumferentially winding a thin silicon steel sheet, and three layers of permanent magnet groups are uniformly embedded in the circumferential direction of each rotor core; each permanent magnet group comprises a first layer of U-shaped magnetism gathering structure permanent magnet combination, a second layer of U-shaped magnetism gathering structure permanent magnet combination and a third layer of linear structure permanent magnet which are sequentially arranged from the outer side of the rotor core to the circle center of the rotor core; the two rotor discs are installed on a rotating shaft in a manner that permanent magnet faces are opposite to each other, and a stator disc is arranged between the two rotor discs. According to the built-in permanent magnet rotor structure of the axial flux motor of the invention, the magnetism gathering capability of the permanent magnet rotor discs is stronger, and highly sinusoidal air gap flux density can be realized; the U-shaped permanent magnetcombinations and the linear permanent magnet combinations adopted, so that the salient pole effect of the motor can be improved, the reluctance torque is fully utilized, and the torque or power density of the motor is improved; and the silicon steel sheet is slotted and wound to form the rotor core, so that the machining is convenient and the structural strength is high.