240results about How to "Good speed regulation performance" patented technology

The invention discloses a starting power generation system for an electric automobile, which comprises a double salient pole starting power generator, a starting power generation controller and controller working power; the starting power generation controller comprises a bidirectional power conversion circuit, an exciting current detection unit, an output current detection unit, an output voltage detection unit, a position rotation speed detection unit, an armature current detection unit, an exciting main circuit and a digital signal processor, wherein the exciting main circuit includes an exciting relay, a rectification filter unit and a chopper circuit which are connected in series in turn; and the digital signal processor is connected with the exciting current detection unit, the output current detection unit, the output voltage detection unit, the armature current detection unit, the position rotation speed detection unit, and the control ends of the bidirectional power conversion circuit, the exciting relay and the rectification filter unit by signals respectively. The invention also discloses an electric automobile and a control method thereof. Compared with the prior art, the starting power generation system is simple in structure, low in cost and flexible to control.

The invention discloses an automatic thickness control system and method of a blown film. The automatic thickness control system of the blown film comprises a film thickness detection module, a film thickness control module, a film cooling and forming mold with a plurality of brushless direct-current motors as well as a control panel. According to the invention, an FPGA (field programmable gate array) control chip of a programmable logic device is utilized to achieve a fuzzy control algorithm so as to obtain the speed control quantity of the brushless direct-current motors; by combining a double-closed-ring control algorithm for the brushless direct-current motors a control signal output by the FPGA control chip is changed and adjusted correspondingly when the thickness of the film is changed; the thickness uniformity of the films at different circumferential parts can be controlled by acquiring horizontal thicknesses of the films at controlled subzones and the positions of air flue openings corresponding to the films via transmission and decoupling control, so that the control requirement on horizontal thickness uniformity of the films can be met; the automatic thickness control system and method of the blown film are high in integrity, small in volume, good in robust performance, stable and reliable in operation, high in expansibility, high in control precision, low in accumulative error, and high in adaptability.

The invention discloses an electromobile driving system vector control method using double inverters. The electromobile driving system vector control method includes the following steps: collecting three-phase stator current, rotor position and rotating speed in an unwinding permanent magnetic synchronous motor, wherein the three-phase current is subjected to 3S / 2R conversion to acquire current under a two-phase rotating coordinate system. A system adopts the vector control method with id equal to 0, a stator voltage instruction under the two-phase rotating coordinate system is acquired through double closed-ring control of a rotating speed outer ring and a current inner ring, stator voltage under the two-phase static coordinate system is acquired through 2R / 2S coordinate conversion, control pulse of the double inverters is acquired through a single-power-source double-inverter SVPWM (space vector pulse width modulation) module, and switch devices of the double inverters are triggered to realize vector control of double-inverter SVPWM of the unwinding permanent magnetic synchronous motor. The electromobile driving system vector control method has the advantages that the unwinding permanent magnetic synchronous motor is quick to start, high in overload capability and good in speed adjusting performance; due to the single-power-source double-inverter SVPWM, voltage level of the system is increased, and safety and reliability of the system are guaranteed.

The invention discloses a permanent magnet synchronous motor parameter identification system based on an improved least-squares method. The real-time resistance value, the real-time inductance value and the real-time permanent magnet magnetic chain value of a permanent magnet synchronous motor are identified through a permanent magnet synchronous motor parameter collecting system and a control system by using a parameter identification algorithm based on the improved least-squares method. The identification system comprises a permanent magnet synchronous motor parameter collection system, a permanent magnet synchronous motor control system and a parameter identification algorithm, wherein the permanent magnet synchronous motor parameter collection system comprises a voltage collector, a current collector and a rotating speed collector; the voltage collector, the current collector and the rotating speed collector are connected with a tested permanent magnet synchronous motor through data transmission wires; the permanent magnet synchronous motor control system uses a sine wave vector control system with the direct axis current id being 0; and the parameter identification algorithm uses the permanent magnet synchronous motor parameter identification method based on the improved least-squares method. The permanent magnet synchronous motor parameter identification efficiency can be improved; the identification speed is accelerated; and the parameter identification accuracy can be ensured.

The invention discloses a motor and AMT (automated mechanical transmission) integration-based electric vehicle driving system and a motor and AMT integration-based electric vehicle driving method. The driving system comprises a driving motor, a motor controller, a transmission drive assembly, a gear selection and shifting execution mechanism and a controller for the gear selection and shifting execution mechanism, wherein the transmission drive assembly comprises driving and driven gears of four gears, two splined hubs, two jointing sleeves and an output sensor; the driving motor is a direct current brushless motor; an output shaft of the driving motor is provided with an internal spline; a shell of the driving motor is integrally and directly connected with a transmission case through fine thread screws after being positioned through fixing pins; the output shaft, with the internal spline, of the motor is positioned in the motor; an input shaft of a transmission is directly inserted into the motor to be connected with the output shaft, with the internal spline, of the motor. According to the system, a clutch is eliminated, so that power interruption time during gear shifting is reduced, and the cost is also lowered; the jointing sleeves and the gears of a target gear can be synchronized during gear shifting by actively regulating the speed of the driving motor, and a synchronizer with high requirements on materials is eliminated from the transmission, so that the cost is further lowered.

The invention discloses an FPGA-based thin film rolling tension control system and method. The system comprises a tension signal collection module, a thin film rolling tension control module, a thin film rolling module and an upper computer operation panel. A programmable logic device FPGA controls a chip to achieve a fuzzy PID control algorithm, the speed controlled quantity of a brushless direct current motor is obtained, a double closed-loop control algorithm of the brushless direct current motor is combined, then signals are controlled to be correspondingly changed and adjusted when tension changes in the rolling process of a thin film, and constant control over the tension in the rolling process of the thin film can be achieved through real-time collection of tension of the thin film by utilization of the fuzzy PID control algorithm; the development cost is low, the integration level of the system is high, the steady state performance is good, the response speed is high, the control precision is high, and adaptability is high.

The invention discloses a two-speed automatic gear shifting rear axle driving system for pure electric vehicles, comprising a motor and a driving axle device, wherein the driving axle device comprises a driving axle shell, a driving axle input large gear which is fixedly arranged outside the driving axle shell, a main reducing gear differential assembly which is arranged in the driving axle shell and two half axles which are respectively used for driving wheels; and transmission is carried out between the motor and the driving axle device through a two-speed automatic transmission. As integrated improvement is carried out on the basis of a traditional rear axle, the system has gear shifting function and good succession; by means of the gear shifting function, the requirement for the motor can be reduced so as to reduce the manufacturing cost, and at the same time, the operating efficiency of the motor can be effectively improved so as to improve the power performance and the economical efficiency of the pure electric vehicles; and moreover, by adopting the two-speed transmission, the mass center of the whole rear axle driving system is conveniently controlled in the vicinity of the longitudinal axis of a vehicle, so that the influence caused by motor offset to vehicle maneuverability is avoided.

The invention discloses equipment, a system and a method for controlling the slewing speed regulation of a tower crane, as well as the tower crane, wherein the tower crane slewing speed regulation control equipment comprises a receiving device for receiving an actual speed signal of a motor; a processing device for comparing the actual speed of the motor with a target speed, calculating a signal value to be regulated corresponding to a deviation when an absolute value of the deviation between the actual speed of the motor and the target speed is within the range of a speed deviation, and controlling a frequency of a transducer or a current of a vortex device depending on the signal value to the regulated, so that a speed of the motor is regulated. By adoption of the tower crane slewing speed regulation control equipment, the speed of the motor is stably and precisely regulated to a target value, thereby a speed control performance is improved.

The invention relates to an electric excitation permanent magnet switch, a reluctance motor for the electric excitation permanent magnet switch and an electric excitation method. In the electric excitation permanent magnet switch, two magnetic poles of a permanent magnet are respectively connected with both ends of an iron core on which magnet exciting coils are wound by two soft magnets; and salient poles are arranged on the soft magnets. In the reluctance motor, the switch is used as basic components of a stator and a rotor, and the two magnetic salient poles of each component are arranged in an axial direction; the salient poles of the stator component and the rotor component are arranged oppositely, and air gaps are reserved between the salient poles; and the magnet exciting coils of the stator component and the rotor component at the axial symmetrical position are connected in series or in parallel and then are used as a phase line respectively to be connected to an excitation control power supply. The invention also provides a combination motor formed by connecting motor monomers by using a shaft in a rotary and dislocation mode and a method for the simultaneous diphase electric excitation of the stator component. The switch and the motor save energy, and have low magnetic loss and high magnetic efficiency; and the combination motor with the diphase electric excitation realizes the subdivision of stepper angles, and improves running stability, control accuracy and output power.

The invention discloses a vector control method for a multi-unit drive system based on an indirect matrix converter, and belongs to the field of converters of power electronics and electric drive control. The vector control method uses one indirect matrix converter to drive a plurality of asynchronous motors to perform speed governing operation by means of parallelly extending parallel extension of an inverter circuit of the indirect matrix converter. When the multi-unit drive system is under regular operation, a rectifying circuit and the inverter circuit both adopt a space vector pulse width modulation (SVPWM) method, all the inverter circuits of the system adopt a semi-symmetric pulse width distribution mode of nine section PWM, therefore output waveform quality and speed governing performance of the system are improved, and current conversion of switching elements is safe and convenient. The vector control method is adopted to achieve high-performance speed governing for the asynchronous motors. According to the vector control method, one matrix converter is used for driving the plurality of motors to operate, redundance of the drive system is increased, and power density of the speed governing system of the asynchronous motors driven by the matrix converter.

The invention discloses an automatic steel rail duplex rust removing machine. The automatic steel rail duplex rust removing machine comprises a rack, engines and wheels connected to the lower portion of the rack, and is characterized in that the two engines are adopted and distributed on steel rails on the two sides respectively, the automatic steel rail duplex rust removing machine further comprises two soft shafts and two steering gears, one ends of the soft shafts are connected with rotating shafts of the engines through couplers, the other ends of the soft shafts are connected with input shafts of the steering gears, output shafts of the steering gears are connected with blade grinding wheels, the rack is fixedly connected with two connecting pieces, vertical adjusting pieces are arranged above the steering gears and elastically connected with the steering gears, connecting rods of the connecting pieces are connected with the vertical adjusting pieces, a transverse spring pull rod is connected between the vertical adjusting pieces of the steel rails on the two sides, and the rack is connected with a drive component. The kinetic energy of the engines is directly transmitted to the blade grinding wheels through the soft shafts, a duplex structure is adopted, synchronous automatic constant-speed rust removing can be carried out on pedal faces of the two steel rails at the same time, and the rust removing quality and efficiency are greatly improved.

The invention discloses a drive control method and device for an electric fork truck, and the electric fork truck. The method comprises the steps: measuring the rotating speed of a motor of the electric fork truck, obtaining a speed error value according to the rotating speed of the motor and a given speed of an accelerator, and determining a corresponding child fuzzy PI controller according to the speed error value; generating a current torque component given value according to the speed error value, the change rate of the speed error value and the corresponding child fuzzy PI controller; respectively generating a current excitation component difference value and a current torque component difference value according to a current excitation component given value, a current torque component given value, a current excitation component actual value and a current torque component actual value; generating a first stator voltage given value and a second stator voltage given value in a stationary two-phase coordinate system according to the two component difference values; generating multipath PWM output according to the two given values in the stationary two-phase coordinate system, and controlling an inverter to output a three-phase voltage value, so as to control the output torque of the motor.

The invention provides a servo direct-driven power head for a press machine. A pair of switch magnetic flow permanent magnet motors is mounted on the two sides of a frame symmetrically; a hollow eccentric shaft mechanism is mounted inside the frame; the shaft ends on the two sides of the hollow eccentric shaft mechanism are inserted into the switch magnetic flow permanent magnet motors, and are connected through the pressing force; a link mechanism is mounted on an eccentric shaft section of the middle part of the hollow eccentric shaft mechanism; a sliding block mechanism is positioned below the link mechanism; a guiding mechanism is mounted on the frame below the link mechanism; the sliding block mechanism slides up and down inside the guiding mechanism; the link mechanism and the guiding mechanism convert the rotation of the hollow eccentric shaft mechanism into the rectilinear motion of the sliding block mechanism; an auxiliary pipeline mechanism is arranged outside the switch magnetic flow permanent magnet motors; and hollow shafts of the switch magnetic flow permanent magnet motors are connected with the hollow eccentric shaft mechanism to form a fluid flow passage. According to the invention, the motors have simple structure, high reliability, and excellent speed governing and heat dissipation performance; the power head adopts the servo direct-driven technology, has a concise structure, high transmission efficiency, and quick action, and the cost is comparatively low.

The invention provides a two-gear mechanical automatic gearbox for an electric vehicle, and belongs to the technical field of electric vehicle transmission. The transmission comprises a transmission control system, a double-stage driving variable transmission mechanism and a gear shift control mechanism, wherein the gear shift control mechanism comprises a centrifugation gear shift control mechanism and a synchronizer gear shift mechanism; and the centrifugation gear shift control mechanism adopts a mechanical structure, detects vehicle speed through gear drive, and generates centrifugal force to be combined with returning force of a spring to realize the mechanical automatic speed change. The automatic gearbox adopts two gears to realize automatic speed change, combines with a driving motor with an excellent speed regulation property, reduces performance requirements of the driving system on the driving motor, and improves the efficiency of the driving motor as well as dynamic property and economy of a whole vehicle; and compared with a conventional electronic-controlled automatic transmission, the manufacturing inheritance is good, and an electrical control operation gear shift mechanism is omitted and replaced with the mechanical gear shift mechanism, so that the manufacturing cost is lowered, and the system stability is improved.

The invention discloses a belt conveyor intelligent control system and method based on machine vision. The belt conveyor intelligent control system can comprise a coal quantity detection device and acontrol device, the coal quantity detection device comprises a structure light source and an image acquisition device, the structure light source is used for projecting structure light to detected coal on a conveyor belt, and the image acquisition device is used for acquiring real-time images of the detected coal under the structure light; and the control device is connected with the coal quantitydetection device and a belt conveyor control box so as to obtain the real-time images and real-time power of the conveyor belt of the belt conveyor, obtain a first predicted coal quantity according to the real-time images, obtain a second predicted coal quantity according to the real-time power of the conveyor belt, analyze according to the first predicted coal quantity and the second predicted coal quantity to calculate the actual mass of the detected coal, and adjust the running speed of the belt conveyor according to the actual mass. The control system can accurately adjust the running speed of the belt conveyor, so that the belt conveyor runs stably and safely.

The invention discloses a low-cost open-winding permanent magnet synchronous motor drive system. A three-phase nine-switch converter comprises three phase bridge arms, which are connected with one another in parallel, wherein each phase bridge arm comprises an upper tube, a middle tube and a lower tube, which are sequentially connected with one another; the upper tubes and the middle tubes form an upper three-phase power output port; the middle tubes and the lower tubes form a lower three-phase power output port; a DC side of the three-phase nine-switch converter is connected with a DC power supply in parallel; the upper three-phase power output port and the lower three-phase power output port are connected with two ends of three phase windings A, B, C of an open-winding permanent magnet synchronous motor respectively; two ends of any phase winding of the open-winding permanent magnet synchronous motor are connected with different bridge arms; a current signal and a voltage signal of the open-winding permanent magnet synchronous motor are collected respectively and transmitted into a control module to achieve rotating speed current double closed-loop control; and a drive module outputs a PWM signal to achieve control on the three-phase nine-switch converter. The system is low in cost and good in speed control performance. The invention further discloses a control method for the low-cost open-winding permanent magnet synchronous motor drive system.

The invention discloses a system and method for controlling hydrological winch. The system comprises a programmable logic controller (PLC) control unit, a human machine interface (HMI) display setting unit, an emergency control contact unit, a rotary encoder, a frequency converter, a frequency conversion brake motor, a rotary drum speed reducer and an angle sensor. The HMI display setting unit is connected with the PLC control unit, the PLC control unit controls the emergency control contact unit and the frequency converter, the emergency control contact unit and the frequency converter are connected with the frequency conversion brake motor, the frequency conversion brake motor is connected with the speed reducer to drive the speed reducer to drive a rotary drum to work, the rotary encoder detects a state signal of the rotary drum speed reducer and transfers the state signal to the PLC control unit and the frequency converter, and the angle sensor transfers an angle signal to the PLC control unit. The system can accurately measure and calculate the length, the speed and relative water depth of a winding and releasing steel wire rope and accurately and stably delivers a device to a designated position to finish surveying and mapping operation.

The invention discloses a variable idling start test bed for an electric car transmission system, and the test bed comprises a control power supply, a DC motor, a shaft coupler, a rotation speed and torque sensor, a clutch, a spline shaft, a brake disc, mechanical braking devices, a DC generator, and a resistor box. The control power supply is connected to the DC motor, and the rotation speed and torque sensor is connected with the DC motor through the shaft coupler. An output shaft of the rotation speed and torque sensor is connected with a driving disc of the clutch, and a driven disc of the clutch is connected to a side of the spline shaft, wherein the other side of the spline shaft is in series connection with the brake disc. The mechanical braking devices are disposed at two sides of the brake disc. The DC generator is connected with the shaft coupler, and is connected to a test bed transmission system. The resistor box is connected to an armature loop of the DC generator in a series manner through a wire. The clutch is disposed in a transmission shaft system in fixed connection with a conventional electric car test bed, thereby forming a flexible connection mode of a transmission system. Moreover, the idle speed can be adjusted, the loading is flexible, the operation and control are simple, and an impact-type load is easy to simulate on the test bed, and the test bed is suitable for actual driving and road conditions.

The invention discloses a flux-weakening control device and method for a DC offset sinusoidal current motor. The device comprises a speed regulator, a current distributor, a d-axis current regulator,a q-axis current regulator, a 0-axis current regulator, a first given voltage phase shift module, a second given voltage phase shift module, a first pulse width regulator, a second pulse width regulator, a converter, the DC offset sinusoidal current motor, a speed sensor and a rotating coordinate transformation module. Composite counter electromotive force of the motor is kept constant at a maximum value of terminal voltage of the motor according to a given value of armature current and a rotating speed feedback value of the motor; and meanwhile, a composite value of the armature current of the motor is smaller than or equal to a rated value, and the composite value of the armature current is kept constant at the maximum value of the armature current of the motor, thereby obtaining the given values of d-axis current, q-axis current and 0-axis current. Therefore, the torque output capability of the DC offset sinusoidal current motor in a flux-weakening range is effectively improved, andthe target of high-speed and wide-range operation of the DC offset sinusoidal current motor is achieved.

The invention relates to a power distributed type electric logistic vehicle. The electric logistic vehicle comprises a first carriage with a steering drive module, and a plurality of connection carriages with power-driven modules, wherein the first carriage is connected with the connection carriages through one electromagnetic force hook, and the adjacent two connection carriages are connected with the electromagnetic force hooks; the corresponding connection surface between the first carriage and the connection carriages, and the corresponding connection surfaces between the adjacent connection carriages separately adopt an arc surface structure. The electric logistic vehicle disclosed by the invention is simple in structure, high in transporting efficiency, large in pulling force and flexible to organize and steer, resources are saved, and the number of the connection carriages can be selected according to the quantity of the goods; besides, distributed type drive is adopted, so that the drive of each of the carriages is mutually independent, and interactive independent control is adopted.

The invention relates to a deep-sea cobalt crust mining truck, which comprises a double-truck body frame type truck body and a cutting device and a connecting and suction device which are arranged at the front of the truck body, a separation bin, an ore storage bin and a drive mechanism which are sequentially arranged on the truck body, wherein the collecting and suction device is positioned above the cutting device. When the deep-sea cobalt crust mining truck provided by the invention operates, the cobalt crust in a mining area is crushed and collected, mineral particles and mud are separated in the separation bin after being transported by a hose, and collected and stored in the ore storage bin, and then finally transported to a surface mother ship through an absorption pipe, and recycled by a cable and an absorption pipe after the operation is finished; and the deep-sea cobalt crust mining truck has the characteristics of high universality, low dilution rate, high terrain adaptability, safety and reliability, relatively low cost and the like.

The invention relates to a pressure control circuit and control method for blood pressure measurement. The control circuit comprises a pressure sensor, a signal processing circuit, a microcontroller, a PWM (pulse-width modulation) controller and a peristaltic pump. The pressure sensor is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the microcontroller, the output end of the microcontroller is connected with the input end of the PWM controller, and the output end of the PWM controller is connected with the peristaltic pump; the pressure sensor collects mixed signals of pressure and pulse waves, the signal processing circuit receives the mixed signals and has the same processed to acquire pressure feedback signals and pulse wave signals, the pressure feedback signals and the pulse wave signals are sent to the microcontroller, and the microcontroller sends control signals to the PWM controller after being subjected to comparison and PI adjustment, the PWM controllers sends out the PWM signals with the corresponding pulse width to complete control of the peristaltic pump. Compared with the prior art, the pressure control circuit and control method has the advantages that the pressure can be effectively controlled to change uniformly during measurement, and measurement precision is improved.

The invention provides a test system for testing comprehensive performance of an eddy current retarder and a test method thereof. The test system comprises the components of a personal computer, a dynamometer system, a torque and rotating speed sensor, an eddy current retarder, an electric controller and a power analyzer. The test system can continuously measure the indexes such as moment characteristic, heat fade characteristic, zero-load wind resistance and power loss of the eddy current retarder at each speed. The test system has advantages of relatively complete function, complete data acquisition, high speed regulation performance and wide test range.

The invention relates to a dimming actuator for headlamps of a vehicle, characterized in that a dimming screw, arranged in a housing, slidably connected with the housing, connected with a circuit board assembly, is connected with the output shaft of a DC motor through a transmission mechanism, the circuit board assembly is electrically connected with the input terminal of the DC motor. The invention has the advantages of compact structure, stable transmission, convenient control, good speed-adjusting performance, quick response speed, and the like.

Disclosed in the invention is an intelligent control method of an electrically-driven motor. According to the control method, with two sets of windings of the motor, the load is driven to be operated by the motor state by using a PI controller, an integral limiter, a prediction controller and an inverter; and the speed adjustment performance is good. The prediction controller is used for replacing the traditional current PI controller, so that the defect of the hysteresis characteristic of the current PI controller is overcome and the band width and dynamic performances of the system are improved. Besides, functions of redundancy communication, fault diagnosis, position signal fault detection and calibration are added and thus the winding open-circuit and short-circuit existence at the control system or position signal faults can be diagnosed and processed respectively. According to the invention, the method has characteristics of simpleness, easy implement, and high intelligence and reliability and the like; fault-tolerant control of the system open circuit, short circuit or position signal fault can be realized well; and the method is suitable for power driven occasions with high requirements of the dynamic performance and reliability.

The invention provides a speed adjusting gear for a double pulse hydromechanical diesel engine, comprising a speed regulator and a load regulator, which is characterized in that a hydraulic servomotor piston with a pilot valve is arranged in a hole of a casing of the speed regulator; a main spring is arranged at one end of the pilot valve fixed on a support unit at the other end; a fly hammer is propped against the support unit; two slots are arranged on the pilot valve, and a sliding block connected with a lever is arranged in the slots; the load regulator being composed of a differential electromagnet, a slide valve and a servo motor controlling momentum feedback is arranged on the speed regulator. The speed adjusting gear for a double pulse hydromechanical diesel engine has the advantages of adaptability and versatility for different sets as well as stable and reliable speed regulation; for example, when the load regulator fails, the speed adjusting gear is able to separately regulate the rotational speed of the diesel engine with excellent stability in the regulating process; a reaction rate of the speed adjusting gear is improved with the fast load regulator, transient overshoot is reduced, and the speed regulation performance of the speed governor is improved.

The invention provides an efficient energy-saving dual salient pole synchronous reluctance motor, comprising a motor mechanical body and a motor control part; wherein, the motor mechanical body comprises a motor shell, a stator which is arranged on the internal wall of the motor shell and a rotor which is arranged at the center in the motor shell; the rotor is arranged on a motor shaft; the motor mechanical body also comprises a motor end cover which is arranged at the two ends of the motor shell; the motor shaft is connected with the motor end cover by a bearing; a shaft sleeve and an oil seal are arranged between the internal end surface of the bearing and the rotor; wherein, the rotor is provided with 8 salient poles; the stator is provided with 12 salient poles and 12 winding coils which are corresponding to the 12 salient poles.

The invention provides a real-time constant-power control method for a diesel electric locomotive, and the method comprises the following steps: firstly setting corresponding relation between the speed and output power of a diesel engine and the standard value of the oil motor resistance; then detecting real-time values of the diesel engine speed, the output voltages and currents of main and auxiliary generators and the oil motor resistance, calculating real-time values of the output powers of the main and auxiliary generators and the diesel engine, determining the real-time standard value ofthe oil motor resistance, comparing the real-time value of the oil motor resistance with the real-time standard value, and correcting the output power set value of the current main generator. According to the invention, the startup and speed regulation performances of the locomotive can be greatly improved and the control can be more accurate, thus avoiding the speed reduction or speed oscillation and haunting caused by overload or abrupt load change of the diesel engine.

This invention discloses a frequency conversion control device of a brushless DC motor including: a test resistor with the resistor serial on a DC bus for getting the bus current test signal and outputting it, an intelligent conversion module including an inverter composed of large power electronic switch components receiving control of switch signals to alter the logic state of the switch controlled by the switch signal and invert DC bus voltage to three-phase drive current to drive rotation of the motor, a control unit used in receiving test signals output by the test resistor to compute and get three-phase input current of the motor based on said test signal and the switch logic state of the large power electronic switch components in the conversion module and to get the position of the rotor based on the current to generate said switch signal and output it based on the position and the expected rev of the motor.

The invention discloses a disc type unit lamination coreless DC motor. The disc type unit lamination coreless DC motor comprises a main shaft, the main shaft is successively sleeved by a first bearing, a first stator disc, at least one third stator disc, a second stator disc and a second bearing, the first bearing is sleeved by a first rotor disc, the second bearing is sleeved by a second rotor disc, at least two third rotor discs are clamped between the first rotor disc and the second rotor disc, adjacent third rotor discs are connected through a ferrule, the inner side of the first rotor disc and the inner side of the second rotor disc are each provided with a first groove, the first grooves are internally provided with first permanent magnets, the outer side of the first rotor disc is provided with a solar gear ring used for transmitting torque, the two sides of each third rotor disc are each provided with a second groove, the second grooves are internally provided with second permanent magnets, coils are embedded in the stator discs, and the coils are fixed on the stator discs through limiting devices. The disc type unit lamination coreless DC motor is small in zero-load currents, wide in efficiency interval and large in output torque and is free from hysteresis resistance.