343 results about "Doubly salient" patented technology

The invention relates to a diagnosis method for power transistor of doubly salient motor driver, belonging to the fault diagnosis method for power device in motor driving system. In the method three-phase current sensor is set on three-phase bridge arm; while three-phase current is measured the measurement for current signal of current reflowing is added; after current reflowing signal is treated digitally and driving signal of power transistor is combined on-line fault measurement and diagnosis for main power circuit are realized. The invention is provided with simple realization and good rapidity. Not only open fault of power transistor can be diagnosed quickly but also it can play a better protecting effect for bridge-arm direct phenomenon maybe generated by short circuit of power transistor. At the same time it provides a feasible method for fault diagnosis of motor driving system based on full-bridge converter.

The invention discloses a model prediction-based doubly salient permanent magnet synchronous motor direct torque control method. The model prediction-based doubly salient permanent magnet synchronous motor direct torque control method comprises the following steps that: stator current and rotor angular speed of a doubly salient permanent magnet synchronous motor are acquired; under eight groups of inverter switching vector signals, and based on the stator current and the rotor angular speed, the output current of the motor at a next moment of each kind of inverter switching vector is predicted according to constraint relationships between current variation quantity, micro components and voltage, current under eight kinds of switching states; based on a direct torque control theory, motor torque and motor magnetic flux linkage at the next moment of each kind of inverter switching vector can be further predicted; and related voltage vectors are selected reasonably with realizing minimum total quantity of the torque and the magnetic flux linkage adopted as a target, and therefore, the operation of an inverter can be controlled real time. With the model prediction-based doubly salient permanent magnet synchronous motor direct torque control method of the invention adopted, switching frequency and loss can be effectively decreased, and torque fluctuation of the motor can be decreased.

The invention provides a four-phase doubly salient motor, which belongs to doubly salient motors. The four-phase doubly salient motor consists of a stator and a rotor which are arranged around the same rotating shaft; 8n salient teeth are uniformly distributed on the stator; exciting windings are embedded or permanent magnet steel is arranged in slots at every four salient teeth on the stator; centralized armature windings are sleeved on the salient teeth of each stator respectively; the armature windings on the salient teeth at the same position in a magnetic field are connected in series with one another to form a one-phase winding; and 6n rotor poles are uniformly distributed on the rotor, wherein n is a positive integer and more than or equal to 1. A motor unit has an 8/6 structure. The polar distance of the stator is triple the arc length of a stator pole; and the rotor pole is as wide as the stator pole. When the rotor poles are widened until the polar arc coefficient is 1/3, the output power is maximum when the motor is used as a generator. Compared with a three-phase 6n/4n polar doubly salient motor, the four-phase doubly salient motor has higher power density, lower winding copper loss, wider speed regulation range and smaller torque pulse.

The present invention discloses a stator permanent-magnetic doubly salient disc-type motor, which comprises stator mechanisms, a rotor mechanism and a motor shaft, wherein the rotor mechanism is arranged between the two stator mechanisms, the rotor mechanism and the stator mechanisms are arranged on the motor shaft, each stator mechanism comprises a stator core, two permanent magnets and 2N annular armature windings, 2N stator teeth are evenly distributed on the inner wall of each stator core, a groove between every two adjacent stator teeth is a stator groove, the permanent magnets magnetized in the peripheral direction are arranged in centers of any pair of stator grooves on the same diameter, and the 2N annular armature windings respectively sleeve the 2N stator teeth; and the rotor mechanism comprises a plurality of rotor cores and a non-magnetic-conductive rotor bracket, the plurality of rotor cores are evenly distributed on the outer circumference of the non-magnetic-conductive rotor bracket, and the rotor cores form rotor salient poles. The stator permanent-magnetic doubly salient disc-type motor can effectively improve the reliability of the motor, reduces size and weight of the motor, improves power density and torque density of the motor, and is suitable to be used in occasions with strict requirements on size of generators or motors.

The invention discloses a fault-tolerant power generation system for the excitation loss fault of an electric-excitation doubly salient machine, and a control method thereof. The system consists of anexcitation power circuit, an excitation power supply, a main power circuit, a main-power power supply, a controller, an energy storage capacitor, a load, an electric-excitation doubly salient machineand a position sensor, wherein the main power circuit is formed by connecting three groups of H-bridge convertors in parallel. An excitation current value is detected in real time, when an excitationloss fault is detected, the excitation power supply is cut off, the system is switched into an excitation loss fault fault-tolerant operation mode from a normal excitation operation mode, the switching tube of a main power converter is controlled to independently provide armature current required for the electric and power generation operation of the excitation loss fault so as to realize the fault-tolerant operation function of the excitation loss fault of the machine, the operation reliability of the electric-excitation doubly salient machine under various environments is improved, and thesystem is suitable to be applied to industries including aerospace, automobiles and the like.

The invention discloses a stator permanent magnetic flux-switching bearing-free motor with E-shaped teeth. The stator permanent magnetic flux-switching bearing-free motor with the E-shaped teeth comprises a stator and a rotor. The stator comprises E-shaped permeance iron cores, permanent magnets, a concentrated armature winding and a set of concentrated floating windings. The concentrated floating windings, the armature winding and the permanent magnets are arranged in the stator. A stator permanent magnetic doubly-salient structure is used, a stator iron core is formed by assembling the permeance iron cores with an E-shaped cross section and the permanent magnets arranged among the permeance iron cores. Openings of the E-shaped permeance iron cores face gaps and evenly distributed on a ring. The permanent magnets undergo tangential magnetizing and magnetizing directions of two adjacent permanent magnets are opposite. Fault-tolerance teeth provide magnetic return paths for the permanent magnets and the armature winding. The armature winding transversely span on two sides of an armature tooth iron core unit of the stator. One set of the floating windings are composed of two sets of floating coils. Two sets of the floating coils are respectively wound on the fault-tolerance teeth of the X axlix direction and the Y axis direction. The stator permanent magnetic flux-switching bearing-free motor with the E-shaped teeth is simple in structure like a bearing-free switch reluctance motor and has high efficiency and high power density like a bearing-free rotor permanent magnetic motor.

The invention discloses a rotor-position sensor doubly salient motor system and a control method thereof, belonging to the field of doubly salient motor systems and the control method thereof. The system consists of a doubly salient motor, an excitation winding, a main power circuit and a control circuit, wherein, the main power circuit comprises a power supply and an IPM; and the control circuit comprises an isolation circuit, a failure detection circuit, a three-phase current sampling circuit, an excitation current sampling circuit, a PWM control circuit, an over-current and over-voltage protection circuit, an ADC module, a position detecting circuit, a rotation speed calculation circuit, a logic control circuit, a capture unit, a speed loop, a current loop, a hysteresis comparator and a PI regulator. The control method indirectly controls the current of the doubly salient motor by adopting a dual-loop control type of internal loop for current and external loop for rotation speed and comparing the given rotation speed for reference with the fed practical rotation speed. The method has simple system, firmer structure, reliable operation and high efficiency.

The invention discloses a stator surface mounted doubly salient pole permanent magnet motor which has simple and firm structure, stronger torque output capacity and higher power density, comprises a stator (1) and a rotor (4), and is characterized in that the rotor (4) is positioned in the stator (1); the stator (1) and the rotor (4) are both in doubly salient pole structure; the stator (1) is provided with a concentrated winding (3) and a permanent magnet (2), wherein, each concentrated winding coil of any phase of the concentrated winding (3) is positioned in an iron-core groove of the stator (1), and each phase concentrated winding coil is in series connection or in parallel connection; the permanent magnet (2) is positioned on the top part of tooth of the stator (1). The motor has no-load counter-electromotive force of a high degree approximate square wave (a straight flute rotor) or a sinusoidal wave (a tapered slot rotor), stronger torque output capacity, higher power density andstronger anti-demagnetizing capacity, and is especially suitable for being used as a driving element of an alternating current governor system.

The invention relates to a stator permanent magnetic flux-switching bearing-free motor with U-shaped teeth. The stator permanent magnetic flux-switching bearing-free motor with the U-shaped teeth is simple in structure, fastened in rotor and high in power, efficiency and reliability. The stator permanent magnetic flux-switching bearing-free motor with the U-shaped teeth comprises a stator and a rotor. The rotor is arranged inside or outside the stator. The rotor and the stator are of doubly-salient structures. Multiple-phase armature windings which are symmetrically arranged, floating windings which respectively control an X axis direction and a Y axis direction and a permanent magnet are arranged on the stator. The armature windings and the floating windings are composed of concentrated coils. Each coil spans in grooves of two sides of a stator iron core unit which is composed of two U-shaped permeance iron cores and a permanent magnet in between. The floating windings are only wound on the stator iron core unit wound by a coil of an A-phase armature winding. According to the stator permanent magnetic flux-switching bearing-free motor with the U-shaped teeth, based on advantages of a traditional flux-switching permanent magnetic motor, the stator permanent magnetic flux-switching bearing-free motor is simple in structure like a bearing-free switch reluctance motor and has high efficiency and high power density like a bearing-free rotor permanent magnetic motor and high theoretic and practical value.

A variable speed rotary motor has the functions of electric feedback, power generation feedback and electromagnetic brake. The variable speed rotary motor is a variable reluctance doubly salient pole motor which comprises a stator and a rotor. An exciting winding is arranged on a salient pole of the stator. The windings with the same phase have opposite winding directions on the neighboring salient poles. Windings on every pole are connected with each other in series. Simultaneously, when the electromagnetic brake is realized to lead the winding to be electrified continuously, the total pole arc edge distance got by adding every pole arc of the salient poles on the circumference of the stator and rotor is between 60 degrees to 200 degrees, wherein, every pole arcs coincide by attracting each other. Furthermore, the coincidental pole arcs are symmetrically distributed on the circumference. The tooth width of the rotor salient pole is bigger than the groove width. The invention provides the variable speed rotary motor which has the functions of the electric feedback, the power generation feedback and the electromagnetic brake.

The invention provides a method for starting a doubly salient motor without position sensor control, which is characterized in that the method includes the following steps: applying a pulse voltage of the same time and equal amplitude to each stator winding combination through an inverter , the corresponding current value is detected at the end of each voltage, and the corresponding current value is a function of the equivalent inductance of each combination mode. There is a corresponding relationship between the inductance and the rotor position, and the initial position of the rotor can be obtained indirectly by comparing the current value; according to Turning to the corresponding switch of the conduction inverter, so that the stator magnetic potential generated by the corresponding stator winding current is ahead of the initial position by a certain angle range, ensuring that the synthetic magnetic potential generated by the stator winding current interacts with the permanent magnetic field to obtain the maximum average electromagnetic torque , to make the motor rotate towards a given direction. The present invention does not need a position sensor, and does not need to obtain motor parameters in advance, and the change of the motor parameters does not affect the realization of the method.

The present invention relates to a doubly salient permanent magnet electric machine that has a winding structure in which series-connected windings are included in the phase windings of a mover, and that has a stator implemented as an iron core having a plurality of permanent magnets and a plurality of stator salient poles neighboring the permanent magnets, thus reducing the number of permanent magnets by half. An electric machine is configured such that a mover moves while facing a stator and includes an N (a number of power phases) multiple number of teeth and phase windings wound around the teeth, and one or more pairs of phase windings of the mover mutually having a phase difference of 180° are connected in series, and the stator includes permanent magnets in depressions between individual stator salient poles of an iron core in which the stator salient poles are formed.

The invention discloses a driving system for a fault-tolerant converter of a doubly salient motor and a control method of the driving system. The driving system is applicable to a single-tube open-short fault of a full-bridge converter or a double-tube open-short fault of the same bridge arm and an outgoing end open-short fault of a single-phase armature winding of the motor, and belongs to the technical field of motor control. The main body of the fault-tolerant converter comprises a four-phase full-bridge inverter, a four-phase armature winding of a doubly salient electro-magnetic motor (DSEM) and a bidirectional switch. When the doubly salient motor driving system normally runs, the bidirectional switch is switched off, the fault-tolerant converter outputs four phase symmetric rectangular wave currents with a different electrical angle of 90 degrees, the four phase symmetric rectangular wave currents are sequentially flown through the four-phase armature winding of the motor, and the motor is driven to run; and after an open-circuit fault is detected, fault-tolerant control is carried out, the fault-tolerant converter is switched to a fault-tolerant state from a fault state, and the motor is driven to stably run with the fault.

The invention discloses an electromagnetic no-bearing doubly salient motor and a control method, and belongs to the no-bearing motor technology field. The motor comprises a stator iron core, a rotor iron core, an armature winding, an excitation winding and a suspension winding. The rotor iron core comprises a plurality of rotor tooth electrodes. The stator iron core comprises a plurality of stator electrodes composed of several stator tooth electrodes. A gap between adjacent stator electrodes forms a stator groove. Armature coils wound on the stator tooth electrodes are connected according to a principle which is the same as the turn chain magnetic flux change rule and the armature winding is formed. An excitation coil and a suspension coil wound on the stator electrode are embedded in each stator groove. The excitation coils wound on the stator electrodes are connected in order and form the excitation winding. The suspension coils in spatial radial relative positions are connected and form an alpha-axis direction suspension winding and a beta-axis direction suspension winding which generating an orthogonal suspension magnetic field respectively. The independent suspension winding is employed to control the suspension force and the non-linear coupling problem is avoided. A suspension current and an excitation current are controlled individually to achieve mutual coupling between motor output and suspension.

The invention discloses an excitation-loss fault tolerance power generation method for a four-phase electric-excitation doubly-salient motor. Whether a system excitation part is in fault or not by detecting the value of an excitation current; if a fault does not occur, the four-phase electric-excitation doubly-salient motor performs uncontrollable rectifying power generation for a load through a full bridge converter, and output voltage closed-loop control is realized by regulating the excitation current; if a fault occurs, a fifth bridge arm is enabled and an excitation angle is set, and four-phase windings are pumped with forward and backward excitation currents through a four-phase five-bridge-arm converter, and excitation-loss fault tolerance power generation is realized based on magnetic resistance electric potential; and the closed loop control of the system power generation output voltage can be realized by regulating the excitation angle. By adding a redundant bridge arm on the conventional full-bridge converter, the excitation-loss fault tolerance power generation of the electric-excitation doubly-salient motor is realized; and the power generation method is simple in control and flexible and effective, and the reliability of the electric-excitation doubly-salient motor is improved, so that the power generation method has wide application prospects in the fields of aviation starting power generation, wind power generation and the like.

The invention discloses a combined brushless direct-current starter generator system and belongs to the field of starter power generation technologies. A brushless direct-current starter generator comprises an electrically-excited doubly-salient motor and a permanent magnet motor, wherein the motors are coaxially connected. An armature winding of the electrically-excited doubly-salient motor is connected with a bridge rectifier circuit to serve as a generation output end of the starter generator system. An armature winding of the permanent magnet motor is connected with a bidirectional bridge power conversion circuit and an asymmetric half-bridge circuit. An exciting winding is connected with a midpoint of the asymmetric half-bridge circuit. During starting, the permanent magnet motor drives an engine to start; after starting, the permanent magnet motor serves as the electrically-excited doubly-salient motor exciter providing the exiting winding with exciting current. The invention further discloses a control method of the combined brushless direct-current starter generator system. Starting torque is stable; power generation control is simple; the problem that starting source voltage and generation output voltage are unbalanced is solved; starting and generating functional decoupling control is achieved; starting and power generation switching is simple and reliable to control.

The invention discloses a five-phase doubly-salient motor. The motor comprises a rotor iron core, a shaft, a stator iron core, magnet exciting coils, armature coils and a motor shell, wherein the stator iron core and the rotor iron core adopt a salient pole type structure respectively, the number of poles of the stator of the stator iron is 10i, and the pole-arc coefficient is 0.333; the number of poles of the rotor of the rotor iron is 12i, and the pole-arc coefficient is 0.4 or 0.5, and i is an integral multiple of 2 or 3; the armature coils are wound on the stator poles of the stator iron core by adopting an integrated winding way, a one-phase armature winding is formed by serially connecting the synchronous armature coils, and the phase positions of all phases of armature windings differ at the electrical degree of 72 degrees; the magnet exciting coils are uniformly wound on the stator poles of the stator iron core, the winding directions consist with the magnetic fields of the linked armature coils, and the directions of the magnetic fields generated by the adjacent magnet exciting coils are opposite. The motor is provided with five-phase windings, so that fault freedom is good; furthermore, the electrodynamic potential amplitudes of all phases are equal, so that share output can be realized; and the number of the rotor poles of the motor is large, so that the motor is specifically applicable to generators with higher reliability requirements.

The invention discloses a topological structure for driving a fault-tolerant power converter of a four-phase electrical excitation doubly salient motor and a fault-tolerant control method. In the topological structure, A and C phase windings with 180 degrees phase differences are connected in series in an opposite way, and B and D phase windings are in the same way; two bidirectional thyristors are added on the base of a four-phase full bridge converter in the prior art; a bidirectional thyristors TR1 is connected between the input ends of the A and B phase windings, and a TR2 is connected between the input ends of the C and D phase windings. When the driving system is running normally, the thyristors TR1 and TR2 are turned off, the control mode adopts four-phase four-state control, trapezoidal wave current with 90 degrees phase difference is put into motor four phase windings in sequence, and the motor four phase windings contribute externally; when single-phase open circuit fault of the converter is detected, the fault-tolerant control method is adopted, the converter is in a fault-tolerant operating state and can output trapezoidal wave current with 90 degrees phase difference to phases of the motor, and the motor has four phase windings to contribute externally and cannot be influenced by a power tube open circuit.

The invention relates to a novel doubly-salient memory electrical machine comprising an outer rotor with tooth and an inner stator with tooth, wherein permanent magnets are arranged on the inner stator. The number of tooth Nr of the outer rotor, the number of tooth Ns of the inner stator and the number Np of the permanent magnets should satisfy the relational expression: (m+k1)*Np=Ns=mk2 and 360Nr/Ns=360k3+/-alpha, wherein m is a phase number and is bigger than or equal to 3, alpha is a slot pitch angle the span of which is 0-360 degrees, k1 belongs to an integer from 1 to 1-m, and k2 and k3 are respectively a random positive integer. AlNiCo is adopted as the permanent magnets, and current pulses with different sizes and polarities are charged to a plurality of separated direct current windings to realize on-line magnetism charge demagnetization, thereby realizing multiple functions. Due to the fact that the duration of the current pulse is short, and the induced loss almost can be neglected, as an electromotor, the electrical machine can realize on-line magnetism modulation in the real sense while in running, and as a generator, the electrical machine can realize high-efficiency constant-voltage output while in running.

The invention discloses an electrical excitation doubly salient two-speed wind-driven generator system and a control method thereof, wherein the system is provided with a wind turbine, a rotary speed sensor, a first electrical excitation doubly salient generator, a second electrical excitation doubly salient generator and a bridge rectifier from left to right in turn, and further comprises an excitation circuit, a first excitation winding, a second excitation winding, a wind turbine rotary speed detecting circuit, a main control unit, a driving circuit, a compressor governor main circuit, a comprehensive protection circuit, a sampling conditioning circuit, an excitation power supply, a voltage sensor, a current sensor, an output voltage detecting circuit and an output current detecting circuit. The control method of the invention comprises two working modes, and can convert the working modes through feeding back the rotary speed. The invention has simple structure, convenient control, excellent practicability and feasibility.

The invention discloses a line voltage detection-based doubly salient electro-magnetic motor position-less control method. The method includes the following steps that: firstly, line voltage U AB, U BC and U CA of a doubly salient electro-magnetic motor is detected; secondly, the value of line voltage difference is calculated according to current conducted phases; and thirdly, phase commutation is performed according to a principle that the line voltage difference abruptly changes and is increased in phase commutation, the value of the line voltage difference is compared with a preset phase commutation threshold value, if the value of the line voltage difference is greater than the threshold value, phase commutation is performed, if the value of the line voltage difference is smaller than or equal to the set threshold value, the current conducted phases are maintained continuously. The line voltage detection-based doubly salient electro-magnetic motor position-less control method of the invention is simple in realization. With the line voltage detection-based doubly salient electro-magnetic motor position-less control method adopted, influence of neutral point voltage fluctuation, on the position-less control algorithm, can be effectively eliminated, and an additional hardware circuit is not required to be additionally adopted.

The invention discloses a controllable single-phase bridge rectifying generating system with a doubly salient electromagnetic motor, belonging to special type generating systems. The generating system is composed of three main parts, namely a doubly salient electromagnetic motor, a single-phase bridge controllable rectifying circuit and a generator controller, wherein the armature windings of the doubly salient electromagnetic motor are not in star connection but are respectively connected with the bridge type controllable rectifying circuit and independently rectified and output; the controller of the generating system can generate a driving signal of a bridge circuit controllable switch device according to the received generator rotor position signal and three-phase armature current signal to control the magnitude of the armature current, thereby realizing power-factor correction of the doubly salient generator by the bridge circuit; and according to the direct-current side voltage signal feedback quantity, the exciting current value can be changed to regulate the magnetic field intensity, thereby realizing excitation voltage regulation of the doubly salient electromagnetic motor, and forming a phase parallel mode and a phase series mode during power supply for a load to adapt to different load requirements.