64 results about "Asynchronous machines" patented technology

Regulation of the active and reactive power of an induction machine in a coordinate system fixed on the winding, wherein a first regulator output variable is generated using a first regulator as a function of a setpoint variable deviation of the active power and a second regulator output variable is generated using a second regulator as a function of a setpoint variable deviation of the reactive power, feedback variables are added to each of the first and second regulator output variables, which are functions of at least one chronologically changing system variable of the induction machine, and a voltage or a current of the induction machine is determined as a manipulated variable without further regulation at least from the first and second regulator output variables added to the feedback variables. The feedback variables may linearize the regulation path and then allow restriction to only two simple regulators, e.g., two PI regulators. The regulation may be used in double-fed asynchronous machines.

The invention relates to a method for the controlled application of a stator-current target value (ISnom) and a torque target value (Mnom) for a polyphase machine (4) that is supplied by an electronic power converter. According to the invention: current components (ISdnom, ISqnom) in a co-ordinate system (d, q) with a fixed rotor flux or rotating magnetic pole are calculated in accordance with a torque target value and in asynchronous machines in accordance with a rotor-flux target value (ψRnom), a calculated rotor-flux actual value (ψ<SB>R< / SB>) or a rotating magnetic-pole flux; a stator-circuit frequency (ω<SB>S< / SB>) is determined; a terminal-flux target value (ψKnom) is calculated in accordance with the values (ISnom, ISqnom, ψ<SB>R< / SB>, ω<SB>S< / SB>) by means of the machine parameters (L, R<SB>S< / SB>), said terminal-flux target value being subsequently projected onto a flux-course curve, selected from stored, off-line optimised flux-course curves. This permits the state of the stator current (I<SB>S< / SB>) to be regulated in relation to the rotor flux (ψ<SB>R< / SB>) or rotating magnetic-pole flux by means of momentary values, facilitating a stationary and dynamic precise control of motor currents (I1,I2,I3) and thus the torques (M) of a polyphase machine (4).

The invention provides an asynchronous machine stator flux estimation system based on a current model and a method. The system comprises a stator current sampling unit, a stator voltage sampling unit, a motor speed sampling unit, a coordinate conversion unit and a stator flux calculating unit, wherein the stator current sampling unit, the stator voltage sampling unit and the motor speed sampling unit are respectively used for sampling stator three-phase current, voltage and motor rotor speed of a three-phase motor; the coordinate conversion unit is used for converting the stator three-phase current and the stator three-phase voltage obtained through sampling into stator current and stator voltage of an axis alpha and an axis beta; and the stator flux calculating unit is used for calculating stator flux amplitude of the motor according to the stator current and the stator voltage of the axis alpha and the axis beta and the motor rotor speed. The invention also provides a corresponding method. The system obtains good stator flux estimation effect by decoupling cross coupling items estimated through stator flux of the axis alpha and the axis beta in a static coordinate system.

The invention relates to the asynchronous motor energy efficiency estimation method based on online monitoring; the method comprises the following steps: analyzing fixed eccentric harmonic wave signals gathered from the asynchronous motor stator current and identifying the signals to obtain the rotor rotating speed; secondarily, using the linear portion of the asynchronous motor machinery featuresand the rotating speed to obtain the motor rotor shaft electromagnetic torque; finally, using the electromagnetic torque and a motor synchronization angular velocity to solve the motor output power,thus identifying the motor operation energy efficiency. The method analyzes the fixed eccentric harmonic waves in the stator current so as to estimate the motor rotating speed, thus preventing photoelectric encoder installation, and realizing speedtransmitter-free rotating speed estimation; the method obtains the motor rotor shaft electromagnetic torque according to the linear portion of the asynchronous motor machinery features and the rotating speed, and solves the problems that the motor rotor shaft electromagnetic torque cannot be directly measured; the method is simple in operation, can reduce the system cost, and can fast obtain the motor operation energy efficiency.

The invention provides a power calculation based slip estimation system. The power calculation based slip estimation system comprises a current sampling unit, a current conversion unit, a current regulation unit and a slip calculation unit, wherein the current sampling unit is used for sampling three-phase current of an asynchronous motor, the current conversion unit is used for obtaining feedback current D-axis component and Q-axis component, the current regulation unit is used for obtaining D-axis stator voltage and Q-axis stator voltage, and the slip calculation unit is used for obtaining slip according to the D-axis stator voltage, the Q-axis stator voltage, the feedback current D-axis component, the Q-axis component and a rotor time constant. The invention further provides a corresponding method. The system and the method have the advantages that the slip is estimated according to the ratio of active power to reactive power to enable rotor field orientation error caused by the rotor time constant Tr during speed regulation to become smaller, so that rotor field orientation effect of the asynchronous motor is improved effectively, and torque control precision is improved.

The invention provides a hub motor with external spline shaft. Based on a traditional motor with three asynchronous machines and through the design change of shape and structure, the invention is allowed to be a hub motor with reliable performance, simple structure and strong practicality. Two sides of a motor shell are provided with motor pedestals perpendicular to motor shafts so as to continent for connecting with a suspension of an electric vehicle; the external end of the motor shafts are provided with the external spline and a wheel connector; a wheel and a brake drum or a brake disk are arranged on the wheel connector on the external end of the motor shaft by a wheel bolt. A brake floor and a brake clamp support are arranged on an external side end cover of the hub motor. The internal end of the motor shaft is provided with a gap-adjusting nun used for adjusting the gaps of the bearing, namely, used for adjusting the gaps of the wheels in real usage. The invention is applicable to the manufacture of small-sized electric vehicle.

The invention relates to an asynchronous machine (1) as can be used particularly in electric vehicles or hybrid vehicles. The asynchronous machine (1) has a rotor (5) and a stator (3). The asynchronous machine is designed and controlled in such a manner that it has a pole pair number p of p=3. Because of the reduced yoke saturation that can consequently be achieved, the stator yoke (9) can be designed with a lesser height hy1, such that a ratio of the outer rotor diameter D2a to the outer stator diameter D1a can assume values between 0.7 and 0.8. As a result, enlarged rotor teeth (19) and correspondingly enlarged rotor grooves (21) can be formed in the rotor (5), such that electrical losses in the material in the rotor grooves (21) acting as the rotor coil element (23) are smaller in comparison to conventional asynchronous machines. The electrical losses occurring to a greater extent in the stator (3) compensating for this lead to a lesser warming of the stator (3) than would be the case with the rotor (5) as the stator (3) can be cooled by simple means. Overall, a higher continuous torque can thus be achieved with the asynchronous machine (1) according to the invention.

The invention discloses an asynchronous electromechanical mixing spring-free antitheft alarming lock. A connection body of the asynchronous electromechanical mixing spring-free antitheft alarming lock is hidden in a hidden hole and is separated from a rear lock cylinder; an expansion sheet locks a front lock cylinder; the front lock cylinder and the rear lock cylinder are completely separated and asynchronously rotate to realize alarming; an electronic remote control device is mounted in a power supply circuit of an electromagnet in a hiding manner; electromechanical interlocking hiding, mechanical interlocking, connection hiding of the front lock cylinder and the rear lock cylinder and asynchronous alarming are integrated, so that a thieve cannot open an interlocking device and rotate the rear lock cylinder; even if an external expanded lock and the connection body part are damaged by a savage way, the thieve can only rotate the front lock cylinder, and the rear lock cylinder cannot be rotated; even if the thieve drills off the front cylinder lock and the rear cylinder lock with an electric hand drill and rotates a connection tongue with a tool such as a clamp, a rotating contact is not in contact with a fixed contact, so that the power supply circuit of the electromagnet cannot be conducted; furthermore, the electronic remote control device interrupts the power supply circuit of the electromagnet, so that the thieve cannot open an insurance lock lever, and a complete and thorough burglary prevention effect is achieved.

The invention provides an asynchronous machine stator flux estimation system based on a current model and a method. The system comprises a stator current sampling unit, a stator voltage sampling unit, a motor speed sampling unit, a coordinate conversion unit and a stator flux calculating unit, wherein the stator current sampling unit, the stator voltage sampling unit and the motor speed sampling unit are respectively used for sampling stator three-phase current, voltage and motor rotor speed of a three-phase motor; the coordinate conversion unit is used for converting the stator three-phase current and the stator three-phase voltage obtained through sampling into stator current and stator voltage of an axis alpha and an axis beta; and the stator flux calculating unit is used for calculating stator flux amplitude of the motor according to the stator current and the stator voltage of the axis alpha and the axis beta and the motor rotor speed. The invention also provides a corresponding method. The system obtains good stator flux estimation effect by decoupling cross coupling items estimated through stator flux of the axis alpha and the axis beta in a static coordinate system.

The invention relates to the technical field of pipeline connection, in particular to a pipeline flange connecting device and fluid equipment using the same. A pipeline flange connecting device comprises a first supporting part, a second supporting part, a clamping part, a ratchet mechanism, a transmission mechanism and an adjusting mechanism. The first supporting part comprises a first supporting ring frame and a first threaded ring, and the second supporting part and the first supporting part are the same in structure, are oppositely arranged and comprise a second supporting ring frame and a second threaded ring. The clamping part comprises a plurality of clamping plates arranged on the two sides of the flanges of the two pipelines. The adjusting mechanism comprises a plurality of bevel gears, a plurality of handles, an asynchronous mechanism and a switching part. According to the pipeline flange connecting device, the first threaded ring and the second threaded ring are firstly driven to rotate synchronously, so that the two flanges are close to each other, and the first pipeline and the second pipeline are connected. And then one threaded ring is fixed, and the other threaded ring is rotated, so that the flange is clamped more tightly. The fluid equipment using the connecting device is not prone to liquid leakage.

The invention provides a machining process for solving waste discharging and material saving. Punching and compounding are conducted through a single production line, finished products are output, the machining cost is reduced, and the machining precision is high. A roll material advances along a roller way by a jumping distance A, double-faced adhesive tape advances by a jumping distance B through an asynchronous machine after a lower release film of the double-faced adhesive tape is peeled off, the portions, with the first area shapes, of the double-faced adhesive tape are punched by knives A to be compounded on the upper surface layer of the roll material, A is larger than B, and then the roll material carries the double-faced adhesive tape with the first area shapes arranged at intervals to advance step by step. Upper release films on the portions, corresponding to the first area shapes, of the double-faced adhesive tape are rolled up through box sealing adhesive tape, then a complete PET film is compounded on the upper surface formed by the double-faced adhesive tape and the roll material, the portions, with the first area shapes, of the double-faced adhesive tape are punched again through knives B, then waste is discharged through the PET film, and the residual PET film connected to the upper surface of the double-faced adhesive tape is rolled up through the box sealing adhesive tape again. Then, injection-molded parts are attached to the double-faced adhesive tape in the set shape one by one, and finally a finished product is obtained through roll material rolling.

The invention discloses a fault detection method of an asynchronous traction motor, which belongs to the technical field of fault diagnosis, so that the fault detection method of the asynchronous traction motor of a high-speed railway train can still be accurately detected when the constructed model has uncertainty break down. The detection method of the asynchronous traction motor includes: building a model step: constructing a discrete state space model of the asynchronous traction motor; collecting data step: collecting output current data and input voltage data of the asynchronous traction motor at the current moment; fault detection step : Obtain the pre-stored state range of the asynchronous traction motor at the current moment, combine the output current data and the input voltage data, and use the discrete state space model to detect whether there is a fault in the asynchronous traction motor. This method is suitable for asynchronous traction motors of high-speed railway trains.