1048results about "Speed/accelaration control using electric means" patented technology

The present invention provides a method for controlling the output power of a permanent magnet electric motor (102) using a control means (106). The control means (106) includes a means (134) for measuring motor speed (134) and motor phase current (134), and a means for controlling motor phase current (110) to a desired level. A known relationship between motor phase current and motor torque is then employed by a torque controller so that motor shaft torque can be controlled. A power limiting means (128) then limits the output mechanical power of the motor by dividing a limit value of power by the motor speed to produce a maximum allowable torque setting for that speed.

A method, computer system, and computer readable medium for prioritizing a plurality of variable speed devices. The method includes: determining, for a first variable speed device, a cost dependent on an operating cost of the first variable speed device operating at part loads for a specified period of time, determining, for a second variable speed device, a second cost dependent on an operating cost of the second variable speed device operating at part loads for the specified period of time, and displaying on a graphical interface screen a listing of the first variable speed device and the second variable speed device in a priority order based on the cost and the second cost.

The invention relates to an improved active-disturbance-rejection and PID cascade control method. Regarding to the problem of large turning errors in position turning, the improved active-disturbance-rejection and PID cascade control method formed by applying active-disturbance rejection control to a speed loop of a precision servo system is provided, the control law of active-disturbance rejection is improved, and the essence of the improvement is as follows: the traditional control law of active-disturbance rejection is designed into PID. Since the design of a conventional non-linear active-disturbance-rejection controller is complicated, the parameters are large in number and difficult to adjust, the improved active-disturbance-rejection and PID cascade control method greatly reduces the number of parameters to be adjusted by adopting a linear active-disturbance-rejection structure, has the advantages of simple structure and easily adjusted parameters, can reduce position tracking errors, and improves the tracking accuracy of the system.

The invention discloses a rolling compaction quality monitor for a road roller. The rolling compaction quality monitor comprises a sensor unit used for detecting the rolling compaction operation quality conditions of the road roller, a master control unit used for analyzing and processing the signal detected by the sensor and obtaining the detection result, and an execution unit used for executing the instruction transmitted by the master control unit, wherein the sensor unit, the master control unit and the execution unit are sequentially connected. The rolling compaction quality monitor for the road roller is simple in structure, reasonable in design, convenient to implement, high in intelligent degree, convenient to use and operate, complete in functions, high in operating reliability and high in engineering practical value; moreover, the system conditions of the road roller can be monitored in real time, and an operator conveniently and timely changes the operating state of the machine according to the needs.

A system is provided for determining a quality of a location estimation of a powered system at a location. The system includes a first sensor configured to measure a first parameter of the powered system at the location. The system further includes a second sensor configured to measure a second parameter of the powered system at the location. The system further includes a second controller configured to determine the location estimation of the powered system and the quality of the location estimation, based upon a first location of the powered system based on the first parameter, and a second location of the powered system based on the second parameter of the powered system. A method is also provided for determining a quality of a location estimation of a powered system at a location.

In order to simultaneously realize an improvement in disturbance suppression force of an electric motor control apparatus and vibration suppression of a load machine, a velocity control circuit receives a velocity command signal as a target value of velocity of an electric motor and a corrected velocity signal, obtained by correcting a velocity signal with a velocity correction signal, and outputs a torque command signal specifying target torque of the electric motor driving the load machine. A vibration suppression circuit outputs a velocity correction signal, based on an acceleration signal, indicating acceleration of the load machine. A transfer function from the acceleration signal to the torque command signal is obtained by multiplying a transfer function from a position signal, indicating position of the electric motor to the torque command signal, by a proportion characteristic having a specified gain and integration characteristic.

A traction control system and method are provided for an aircraft equipped with a ground travel drive system with drive wheels powered by onboard wheel drive means that are capable of translating torque through the aircraft drive wheels and that are automatically controllable to control traction without reliance on the aircraft's brakes to keep the aircraft moving efficiently and autonomously on the ground under a range of environmental conditions.

Embodiments of the invention relate to the technical field of aircrafts, and disclose a method and device for estimating angle and angular velocity of a holder motor, a holder, a photographing assembly, and an aircraft. The holder is used for carrying a photographing device. The holder includes a base and a motor. The photographing device is connected with the base through the motor. The photographing device is provided with a first inertia measurement unit, and the base is provided with a second inertia measurement unit. The method includes the steps: acquiring a first angular velocity measurement value collected by the first inertia measurement unit, and acquiring a second angular velocity measurement value collected by the second inertia measurement unit; determining the angle of the motor according to the first angular velocity measurement value and the second angular velocity measurement value; determining the angular velocity of the motor based on the angle of the motor, the first angular velocity measurement value, and the second angular velocity measurement value. The method can reduce the cost in obtaining the angle and angular velocity of the holder motor, and effectivelyimproves the estimation accuracy of the angle and angular velocity of the holder motor.

This application discloses a control device for controlling a motor configured to drive an oscillatory cyclo-speed reducer including an oscillatory gear portion formed with at least one hole at an eccentric position. The control device includes an angle acquirer for acquiring input information about an input rotational angle indicating a rotational angle of the motor, an estimator for estimating an angular error between the input rotational angle and an output rotational angle indicating a rotational angle of the oscillatory cyclo-speed reducer based on a quantity of the hole(s) and a corrector for determining a compensation current value in correspondence to the angular error and setting a magnitude of a current to be supplied to the motor by correcting a command current value using the compensation current value.

The present invention discloses a range hood rotating speed control method and device, wherein the method comprises a step A of obtaining the current operation rotating speed of a DC motor in a range hood under the driving of a current pulse width modulation signal; a step B of calculating the difference value of the current rotating speed of the DC motor and a preset target rotating speed; a step C of determining whether the difference value is within a preset threshold value range; a step D of when the difference value is outside the preset threshold value range, adjusting the current pulse width modulation signal according to a preset rule and driving the DC motor to operate with the adjusted pulse width modulation signal; a step E of when the difference value is within the preset threshold value range, determining a calibration value of the range hood according to the current pulse width modulation signal, and exiting a calibration mode. According to the present invention, the technical problem in the prior art that the rotating speed deviation of the range hood is large on the same working condition, so that the performance index consistency of the range hood can not be guaranteed, is solved.

The invention discloses a feed-forward control method for a robot servo system. The method comprises following steps: analyzing the robot kinematics and dynamics; deducing a mathematical expression of a load equivalent inertia J([theta]) of the robot based on the assumption that kinetic energies before and after equivalence are equal to each other; by use of the relation between the equivalent inertia change and positions, the load equivalent inertia J([theta]) which is calculated in real time with a position value[theta] is converted with a transmission ratio and then is accumulated with a rotational inertia JM of an electrical motor to obtain a total rotational inertia J of a motor shaft; finally, adjusting a current feed-forward coefficient [alpha] by use of the total rotational inertia J of the motor shaft to change the feed-forward value and therefore the servo control effect is increased. By use of the method, there is no need to identify the rotational inertia of the robot load; feed-forward control is adopted to eliminate the influence of inertia change on system dynamic performance; the method is simple and convenient to apply.

The invention relates to an electronic speed-regulating method and a speed-regulating device thereof. The method comprises the following steps of: 1) setting an electronic speed regulator comprising a control box, an executing mechanism, a rotating speed sensor and a power supply, installing the rotating speed sensor at the part of a turning gear ring of a diesel engine, respectively connecting the input end of the control box with the output end of a driver controller and an auxiliary device of the diesel engine, and respectively connecting the output end of the control box with the input end of the executing mechanism and the input end of an exciting coil on a main generator; 2) presetting rotating speed amount of the diesel engine; 3) collecting feedback rotating speed amount of the diesel engine; 4) calculating the difference between the preset rotating speed amount of the diesel engine and practical rotating speed amount of the diesel engine; 5) using an IPD rotating speed control method to calculate expected displacement amount of the rack of an oil-spraying pump of the diesel engine; 6) collecting feedback displacement amount of the rack; 7) calculating the difference between the expected displacement amount and the practical displacement amount of the rack; and 8) using a PID rack control method to generate a PWM signal transmitted to the executing mechanism and a PWM signal for controlling the exciting coil to output exciting current. Based on position control, the invention is not influenced by rotating speed of the diesel engine and has wide application range.

The invention relates to engineering machine hydraulic motor heat elimination system temperature data acquisition and control system. Its features are that using constant displacement motor to drive fan; setting temperature sensor at the outlet of the heat elimination assembly; using its transmitted signal to control proportion electromagnetism pressure reducing valve and adjust the fan; setting the temperature sensor at its inlet to process synchronous acquisition for the outlet and inlet temperature; using electronic control unit to control the acquired signal to generate corresponding drive current and drive proportion electromagnetism pressure reducing valve. Its advantages are that it can control machine working temperature range by controlling fan rotate speed, record each heat radiator inlet and outlet temperature and proportion electromagnet drive current data, estimate the match and performance of the radiator according to the data; it has high utilization factor for engine power; and it can save fuel.

The invention discloses an energy-saving control method for paver. Presetting paving thickness, paving width, and paving velocity in paving work are inputted into the collocating cell of engine working point in controller. According to it presetting rotating speed value of engine is obtained. The controller adjusts the engine of paver so that the actual rotating speed of paver is equal to the rotating speed of engine according to the presetting rotating speed value of engine obtained. The method in invention is provided with simple operation, high automaticity. It can adjust the rotating speed of engine according to the change of actual working condition so that not only the whole efficiency is improved but also it is provided with the energy saving under the presence of ensuring working performance.

Systems and methods are provided for a variable cooling capacity cryocooler for a superconducting magnetic resonance imaging device having a liquid cryogen pressure vessel to provide cryogenic temperatures to a magnet assembly, a vacuum vessel surrounding the pressure vessel and a radiation shield spaced from the cryogen pressure vessel, and a pressure sensor positioned inside the cryogen pressure vessel pressure boundary for sensing pressure variations. A controller for varying the heat removal rate of the cryocooler based on the pressure variations in the cryogen pressure vessel and where the cooling capacity of the cryocooler is adjusted by modifying the speed of the electric power drive (DC or AC motors) or by changing the mechanical transmission ratio between the constant speed electric power drive and the cryocooler displacer/piston to adjust the cooler oscillating frequency of the gas flow. The invention can be adapted to magnets or non magnets systems using Stirling, Gifford-McMahon (“GM”) and Pulse Tube (“PT”) cooler systems. The system will extend component end of life and provide a controllable constant pressure improving image quality for superconducting MRI magnets.

The invention provides a control system of a dual-frequency converting type wire drawing machine, which is composed of a plurality of main components, such as a wire drawing machine, a motor, a transducer, a cone pulley, a sensor and a pull traction frame. The system makes use of the dual-frequency converting controller to take the high speed pulse as the speed signal of the transducer; the two transducers are respectively connected with the wire putting and the wire collecting motor, and are used to realize the operation of the wire putting and the wire collecting from the wire drawing machine; the dual-frequency converting controller receives the main engine speed signal, the wire collecting speed signal and the tension control signal by two sensors; the two sensors use the proximity switch. Adopting the proposal, the invention improves the automatization control programme, and reduces the workload of the workers; the sensor uses the proximity switch to control the speed and tension, thus the reliability of the device is improved.

Provided is a control circuit for realizing S curve acceleration and deceleration of a motion control system. A CPU bus interface circuit writes the accelerated acceleration, the average speed, the initial speed, the termination speed and instruction displacement parameters into corresponding registers in an instruction parameter register and sends out the working state of the circuit in response to an external request; an initialization circuit reads instruction parameters in the instruction parameter register, calculates the total speed change and reasonably plans the speed change of each section; an accelerated acceleration integral circuit and an acceleration integral circuit execute integral operation and writes the integral operation into corresponding registers in an execution register; a drive pulse inter-pulse calculation circuit reads a speed register and calculates the inter-pulse count value of drive pulses; a pulse generating circuit uses the inter-pulse count value to count a reference clock so as to achieve the required drive pulses; a displacement control circuit counts the output drive pulses, calculates the output displacement and writes the output displacement into a displacement register; and a state transfer and control circuit causes the S curve acceleration and deceleration control circuit to act in an orderly and coordinated mode in response to the reference clock.

In an electrically rotated shovel (construction machine), to stop a rotating body (4), a control system changing means (150) provided in a rotation control device (100) switches a control rule from speed control to position control at the time point at which a target speed is determined to be lower than a speed threshold value. Switching to the position control enables braking torque greater than that in the speed control to be outputted to an electric motor (5), and as a result, the rotating body (4) can be reliably maintained stationary.