52results about How to "Fast torque response" patented technology

The invention relates to a controller of full-power alternative-direct converter used in wind generation, wherein the alternative-direct converter is formed by network converter and the convert of generator; the used generator is a permanent-magnetic generator; the rotor is in permanent-magnetic structure, without external magnetic activate power supply; two convert loops both uses the PWM converters operating in four quadrants, based on full-control element, which can improve the dynamic response, reduce cost and impact, realize bidirectional transmission of electricity, and realize generating via power factor sine wave current parallel network; and the invention uses improved direct torque technique to control the converter, to confirm the sine wave change of input current at the stator, with quick response, low vibration, torque dynamic control and wide speed adjust range.

A synchronous motor with low vibrations and an electric driving system using the motor. A field-coil synchronous motor comprises a stator and a rotor rotatably supported at the inner peripheral side of the stator with a gap left relative to the stator. The stator has a stator coil supplied with electric power while being controlled such that driving torque is reduced as a rotation speed of the rotor increases, and the rotor has a field coil supplied with a field current while being controlled such that the field current is reduced as the rotation speed of the rotor increases. The rotor is a tandem claw-pole rotor comprising plural pairs of N- and S-claw poles disposed side by side in an axial direction, and the plural pairs of claw poles of said tandem claw-pole rotor are relatively shifted from each other in a circumferential direction.

The invention provides an electric tractor. The electric tractor comprises a battery pack (10), an energy management system (12), a main controller (8), a motor controller I (4), a motor I (3), a speed reducer I (2), a power output shaft (1), a motor controller II (7), a motor II (5) and a speed reducer II (6). The main controller is used for receiving a motion signal and a working signal of a vehicle and transmitting a control instruction to the motor controller I and the motor controller II so as to carry out corresponding adjustments, like starting, accelerating, braking and the like on the motor I and the motor II; output torques of the motor I and the motor II are respectively used for driving the power output shaft and wheels by the speed reducer I and the speed reducer II so as to achieve multi-motor independent control. According to the invention, steering, downhill and braking energy can be recycled by using electric brake; requirements on different farmland operations, like rotary tillage, ploughing, transportation and the like can be satisfied; and the electric tractor provided by the invention has the advantages of light weight, flexibility, higher energy conversion rate, no waste gas emission and the like.

An NPC (neutral point clamped) three-level inverter vector control system based on a novel flux observer provides a simplified SVPWM (space vector pulse width modulation) algorithm. A three-level space vector is decomposed into a two-level space vector; a reference voltage vector is translated; a two-level SVPWM algorithm is used to obtain action time of each basic vector and to choose a right switching status; and the three-level inverter vector control calculation is reduced. Meanwhile, in the invention, the novel flux observer is employed to calculate the rotor flux, so that a current model and a voltage model are used respectively at a low speed and at a high speed; and when a rotation speed is between the low speed and the high speed, an invented hybrid flux observer is used to calculate the rotor flux.

The invention discloses a hill starting auxiliary control method for a vehicle directly driven by a motor. Serious hill slipping of the vehicle is avoided by superposition of an anti-slope torque without extra mechanical structures or sensors, hill starting auxiliary control of the vehicle can be realized according to an integral vehicle control strategy, and easiness in implementation is achieved. In addition, PI torque control is well adaptive to different gradients, quickness in torque response and high adaptability are realized, hill slipping risks are effectively reduced, and safety in hill starting is greatly improved.

The invention relates to a pure electric vehicle drive antiskid system and control method. The system comprises an MCU (micro-control unit) integrated drive controller, a drive motor and a wheel speeddetection device, wherein the wheel speed detection device is arranged on a wheel and in communication connection with the MCU integrated drive controller, the drive motor is in communication connection with the MCU integrated drive controller and used for driving the wheel, the wheel speed detection device is used for detecting the wheel speed and/or accelerated speed of the wheel and transmitting the speed to the MCU integrated drive controller, the MCU integrated drive controller receives the wheel speed and/or accelerated speed, calculates slip rate and triggers an drive antiskid functionwhen the slip rate or accelerated speed exceeds a threshold, and the torque of the drive motor is adjusted to ensure the overall dynamic property of a vehicle. control modules are fewer, reliabilityis high, a TCS (traction control system) function can be achieved without an ESP (electronic stability program) module, development period is short, and hardware and software cost is greatly reduced.

The invention discloses a direct torque control method suitable for a multi-motor system. Firstly, a torque and flux linkage evaluating function of the multi-motor system is established; a torque and flux linkage impact factor table is obtained through the discretization and equalization processing on the evaluating function; then, the torque reference value of a single motor is generated through a deviation coupling controller of the multi-motor system; lastly, a torque impact factor reference value p Tau* and a flux linkage impact factor reference value p Lambada* are calculated, an objective function is established, and an inverter voltage vector enabling the value of the objective function to be minimum is selected according to the torque and flux linkage impact factor table and is used for controlling the multi-motor system. According to the direct torque control method, fast torque responses of the multi-motor system can be achieved, and torque ripples in steady-state operation can be lowered; the impact degrees of different inverter voltage vectors on the electromagnetic torque and the motor stator flux linkage amplitude of the multi-motor system under the action of different duty ratios can be comprehensively, directly and finely reflected through the established torque and flux linkage impact factor table.

The invention relates to a full speed range control method and control device for a double-feed motor; the invention adopts a rotor side frequency conversion vector control method and carries out adjustment by a given rotating speed and an actual rotating speed, so as to realize the decoupling control of a torque current and a field current; besides, the invention also adopts a diode-clamp back-to-back double tri-level transducer which can lead a rotating difference power to be capable of flowing in double direction by the transducer within the full speed range, thus greatly improving the energy saving efficiency. The method can lead the effects of the device to an electric network to minimize and simultaneously obtain a fast motor torque response; in the whole control process, the voltage and the current aberration rates of the device of the electric network access point are low; the unit power factor operation of the stator side of the motor reduces the reactive impact of the electric network; the switching frequency of the transducer is low, thus reducing the heating of a system and improving the efficiency of the transducer. The method is simple; the device has the advantages of compact structure, being easy to assemble and being convenient to operate; which has board practicability in the technical field.

The invention discloses a PMSM (permanent magnet synchronous motor) load simulation system and a control method therefor, and the system comprises a load simulation PMSM, a load simulation motor drivecircuit, and a data collection control system. The load simulation PMSM is connected with the output end of the load simulation motor drive circuit, and the output shaft of a tested motor is connected with the output shaft of the load simulation PMSM through the shaft coupler. The data collection control system includes a microcontroller, and the input end of the microcontroller is connected witha three-phase current sampling circuit, a three-phase voltage sampling circuit, a speed sensor and a torque sensor. The load simulation motor drive circuit is connected with the output end of the microcontroller. The control method includes the steps: 1, data collection and transmission; 2, data preprocessing 3, the control of the load simulation PMSM in an SVPWM direct torque control mode. The system can accurately simulate a load under different working conditions, has simple method steps, is convenient to implement, and is convenient for popularization and use.

The invention relates to a PWM variable frequency speed control system based on the control of a DSP, and belongs to the technical field of intelligent electrical engineering and electric apparatuses. A motor and an inverter are seen as a whole. A space voltage vector analytical method is adopted for conducting flux linkage and torque calculation on a stator coordinate system, and the torque is directly controlled through a selection of different on-off states of the inverter. Direct torque control is adopted in a control method, and is another novel efficient variable frequency speed control technology after the vector control technology. The direct torque control technology is adopted in the stator coordinate system for calculating the flux linkage and the torque of the motor. Firstly, a dibit controller is adopted, two control signals are directly utilized in the PWM inverter to generate output voltage, and rotation transformation and current control are eliminated, so that the structure of the controller is simplified. Secondly, the stator flux linkage is selected as a controlled variable, so that the model calculating the flux linkage cannot be affected by rotor change, and robustness of the system is improved. Moreover, due to the fact that direct torque control is adopted, rapid torque response can be acquired in the speed-up, speed-down and load change dynamic processes, and variable frequency speed control can be simply and effectively conducted.

The invention discloses a variable-flow speed-change brushless non-reversing permanent magnet direct-current motor, and belongs to the field of direct current motors, aiming to solve the problems thatan existing motor is poor in speed regulation characteristic, large in power consumption and high in manufacturing cost. The variable-flow speed-change brushless non-reversing permanent magnet direct-current motor comprises a machine base, a permanent magnet inner rotor, a permanent magnet outer rotor, a coil inner stator and a coil outer stator, wherein a rotor shaft is arranged in the coil inner stator, a rotor shaft support bearing, and a permanent magnet magnetic suspension inner sleeve and a permanent magnet magnetic suspension outer sleeve that are in the same polarity are arranged at the right end of the rotor shaft, and the permanent magnet magnetic suspension inner sleeve is arranged in the permanent magnet magnetic suspension outer sleeve in a sleeved mode, a coil inner stator permanent magnet magnetic suspension inner sleeve is fastened in the outer diameter of the two ends of the coil inner stator in a sleeved mode, and the openings of the inner diameter of the two ends ofthe permanent magnet inner rotor are tightly sleeved with a coil inner stator permanent magnet magnetic suspension outer sleeve with the same polarity. The stator coil has the advantages of no iron core, no iron loss and high torque response, the utilization rate of the permanent magnetic energy is high, the power consumption is low, the variable speed is achieved through the variable flow, and the super-high speed operation can be achieved.