112results about How to "Suppression of speed fluctuations" patented technology

The invention belongs to generators, and particularly discloses an over-voltage suppression device for a generator unit, which is used for a small internal-combustion generator unit, wherein an alternating-current generator driven by an internal-combustion engine is connected with a plurality of loads. The over-voltage suppression device is characterized in that the alternating-current generator is connected with a voltage sensor, the voltage sensor is connected with a microcontroller through a signal processing unit, and the microcontroller is connected with a standby resistance load via an electronic switch. According to the invention, the voltage sensor is used for detecting the output voltage amplitude and the frequency of the generator in real time, in the case that the microcontroller judges that the load has a large-amplitude sharp reduction according to the fluctuation data of the output voltage amplitude and the frequency of the generator unit, the standby resistance load is instantaneously used via the electronic switch, and the microcontroller is used for supplementing a consecutive power reduction transition area according to the response characteristic of the mechanical governor of the internal-combustion engine, so as to stabilize the fluctuations of the output voltage amplitude and the frequency of the generator. The over-voltage suppression device disclosed by the invention is reasonable in structure, high in energy efficiency, and reliable in performance.

The invention discloses a dual-three-phase PMSG multi-phase open-circuit fault tolerant operation control method and system. The method and the system adopt a double-layer current control loop to control the current and the rotational speed of each phase of the dual-three-phase PMSG, wherein the inner layer current control loop is used for controlling the direct-axis voltage and the time-varying part of the quadrature-axis voltage, and the outer layer current control loop is used for controlling the direct-axis voltage and the non-time-varying part of the quadrature-axis voltage. Compared withthe asymmetric control method of the prior art, the double-layer current control loop control mode adopted by the invention has simple structure and flexible use, and can realize more complete decoupling of the direct-axis current and the quadrature-axis current of the double-three-phase PMSG under the asymmetric state operation, and better effect of restraining the fluctuation of the torque andthe rotational speed. In addition, the control structure in the double-layer current control loop adopted by the invention can be realized by using a common PI controller, the structure is simple, thecost is low, and the calculation amount is not obviously increased.

An image forming apparatus includes an image bearing member; a rotatable endless belt; a first driving member for driving the belt in contact to an inner surface of the belt; a second driving member for driving the belt in contact to an outer surface of the belt; a tension detecting unit for detecting a state of tension of the belt; and a controller for controlling a rotational speed of the second driving member. A driving force applied from the second driving member to the belt is smaller than a driving force applied from the first driving member to the belt. The controller controls, on the basis of a detection result of the tension detecting unit, the rotational speed of the second driving member so that the state of tension of the belt is a predetermined state.

The invention discloses a frequency modulation parameter optimization method for a pumped storage unit, and the method comprises the steps: constructing a simulation model of a to-be-modulated pumpedstorage unit, and the simulation model comprising a fractional order PID controller and a fuzzy inference module; applying preset frequency disturbance to the simulation model, and carrying out optimizing through a search algorithm to obtain an optimal frequency modulation parameter of the controller and an optimal membership function of the fuzzy inference module; calculating and controlling thefuzzy inference module to adopt an optimal membership function based on the unit frequency deviation and the differential of the unit frequency deviation under the optimal frequency modulation parameter to obtain the correction amount of the optimal frequency modulation parameter; and correcting the optimal frequency modulation parameter by adopting the correction amount to complete optimization of the frequency modulation parameter. According to the method, the fuzzy fractional order PID controller is introduced, the frequency modulation parameter can be obtained through optimization according to the frequency deviation adjusting algorithm, rotating speed fluctuation can be effectively and rapidly restrained, and the problem that the frequency modulation efficiency is low due to the factthat only the frequency modulation parameter obtained through algorithm optimization is adopted for frequency modulation control is solved.

The invention discloses a double-input and single-output constant-rotation-speed control system. The double-input and single-output constant-rotation-speed control system comprises a mechanical reversing device, a flywheel energy storage device and a pump-controlled motor speed regulating system which are all sequentially connected. The mechanical reversing device comprises a first clutch connected with an input shaft, a first gear meshed with the first clutch, and a second gear meshed with the first gear. The mechanical reversing device further comprises a second clutch connected with the flywheel energy storage device, and a third gear meshed with the second clutch. The first clutch and the second clutch are coaxially connected. The second gear and the third gear are coaxially connected, and a third clutch is arranged between the second gear and the third gear. The mechanical reversing device makes a transmission shaft output torque in the same direction under the conditions of forward rotation and reverse rotation, and therefore reliability is guaranteed under a high-power working condition. The flywheel energy storage device is used for storing and releasing energy so that the power interruption defect can be overcome, and the fluctuation of the rotation speed of a pump-controlled motor can be inhibited as well. Rotation speeds which change constantly are regulated into a stable rotation speed by the pump-controlled motor speed regulation system, and power generation quality is improved.

The invention discloses an air conditioner compressor rotating speed fluctuation suppression method. The method includes processes of controlling a compressor according to real-time angular velocity and moment. The process of controlling the compressor according to the real-time angular velocity includes the following steps: filtering axis errors to obtain an angular velocity compensation amount;obtaining a compensated angular velocity output amount according to the angular velocity compensation amount; and correcting the real-time angular velocity according to the compensated angular velocity output amount and controlling the compressor; The process of controlling the compressor according to the moment includes the following steps: calculating a difference between a target angular velocity fluctuation amount and the compensated angular velocity output amount to obtain a first angular velocity difference; filtering the first angular velocity difference to obtain filtered angular velocity; inputting the filter angular velocity into a speed loop regulator to obtain output moment; obtaining a moment compensation amount according to the first angular velocity difference; and obtainingcompensated output moment according to the moment compensation amount and the output and controlling the compressor. The effectiveness of compressor rotating speed fluctuation suppression can be improved by applying the air conditioner compressor rotating speed fluctuation suppression method.

The invention discloses a motor current compensation control method and device, a motor, a storage medium and a processor, and the method comprises the steps: determining a target DC bus voltage of the motor according to a given rotating speed of the motor; obtaining the actual DC bus voltage of the motor; determining whether the actual DC bus voltage is smaller than the target DC bus voltage; if the actual direct-current bus voltage is smaller than the target direct-current bus voltage, calculating compensation current according to a voltage difference value between the target direct-current bus voltage and the actual direct-current bus voltage; and taking the sum of the given current and the compensation current of the motor as the operation current of the motor, and controlling the motor to operate according to the operation current. According to the scheme, the running reliability of the motor is improved by inhibiting the direct-current bus voltage fluctuation phenomenon of a permanent magnet synchronous motor control system without an electrolytic capacitor.

The invention discloses a method and a device for controlling the rotational speed of a compressor. The method comprises the following steps: obtaining the axis error reflecting the bias of the actualposition and the constructive position of the rotor of the compressor; carrying out filtering processing on the axis error to obtain axis error compensation quantity after at least a part of axis error is filtered; taking the axis error compensation quantity as an input quantity to be put into a phase-locked loop adjuster in a phase-locked loop used for compressor control to obtain the output angular speed of the phase-locked loop adjuster; taking the output angular speed of the phase-locked loop adjuster as an input quantity to be put into a speed ring adjuster in a speed ring used for compressor control to obtain the output torque of the speed ring adjuster; using the output angular speed of the phase-locked loop adjuster to correct real-time angular speed used for compressor control, and controlling the compressor according to the corrected real-time angular speed and the output torque of the speed ring adjuster. By using the method, the rotational speed fluctuation inhibition effectiveness of the compressor can be improved.

The invention discloses a method for restraining rotating speed fluctuation of a single-rotor compressor. The method comprises the process of controlling the compressor according to the real-time angular speed and the step of controlling the compressor according to the force moment; the process of controlling the compressor according to the real-time angular speed comprises the steps that the axiserror is filtered, and the axis error compensation quantity is obtained; the axis error compensation quantity is input into a phase-locked loop adjuster, and the output angular speed of the phase-locked loop adjuster is obtained; the real-time angular speed is corrected through the output angular speed, and the compressor is controlled according to the corrected real-time angular speed; the process of controlling the compressor according to the force moment comprises the steps that the difference between the target angular speed fluctuation quantity and the output angular speed of the phase-locked loop adjuster is calculated, and a first angular speed difference value is obtained; the first angular speed difference value is filtered, and the filtered angular speed is obtained; the filtered angular speed is input into a speed loop adjuster, and the output force moment is obtained; and the compressor is controlled according to the output force moment. By applying the method, the effectiveness of restraining rotating speed fluctuation of the compressor can be improved.

The invention discloses a method for suppressing the speed fluctuation of an air conditioner compressor, comprising processes of controlling the compressor according to the real-time angular velocityand the torque. The process of controlling the compressor according to the real-time angular velocity comprises: filtering an axial error to obtain an angular velocity compensation amount; obtaining acompensated angular velocity output according to the angular velocity compensation amount; correcting the real-time angular velocity and controlling the compressor according to the compensated angular velocity output. The process of controlling the compressor according to the torque includes: calculating a difference between a target angular velocity fluctuation amount and a feedback angular velocity to obtain a first angular velocity difference; filtering the first angular velocity difference to obtain a filtered angular velocity; inputting the filtered angular velocity into a speed loop regulator to obtain an output torque; obtaining a torque compensation amount according to the first angular velocity difference; and obtaining the compensated output torque and controlling the compressor according to the torque compensation amount and the output torque. The method can improve the effectiveness of suppressing the speed fluctuation of the compressor.

The invention discloses a method and device of suppressing the rotating speed fluctuation of an air conditioner compressor. The method comprises the steps that an axis error which reflects the deviation between the practical position and the presumptive position of a compressor rotor is acquired; the axis error is subjected to filtering treatment, so that a corrected axis error which is formed after at least one part of the axis error fluctuation is filtered away and the angular speed compensation quantity which corresponds to the corrected axis error are obtained; the angular speed compensation quantity compensates for the output angular speed of a phase-locked loop regulator in a phase-locked loop of the compressor, so that the compensated angular speed output quantity is obtained; meanwhile, the direct-current portion of the angular speed compensation quantity is extracted, and the direct-current portion and the compensated angular speed output quantity are inputted into a speed loop regulator in a speed loop for compressor control by serving as the input quantities; and the real-time angular speed for compressor control is corrected according to the compensated angular speed output quantity, and the compressor is controlled according to the corrected real-time angular speed and the output torque of the speed loop regulator. By use of the method and device, the effectivenessof suppression of the rotating speed fluctuation of the compressor can be improved.