21 results about "Rotating reference frame" patented technology

Disclosed are systems and methods for motor control using optimal efficiency reference generation. An electronic controller may determine current values for a motor in a rotational reference frame. Each current value may be associated with a dimension of a set of dimensions of the rotational reference frame. The electronic controller may further determine, based on the current values, a flux linkage value for each of the set of dimensions of the rotational reference frame using an optimization cost function that considers motor speed, copper loss, and core loss. The electronic controller may further determine a target flux linkage value for each of the set of dimensions of the rotational reference frame. The electronic controller may then control a power switching network coupled between a power supply and the motor based on the flux linkage values and the target flux linkage values.

Disclosed are systems and methods for motor control using optimal efficiency reference generation. An electronic controller can determine current values of a motor in a rotating reference frame. Each current value can be associated with a dimension of a set of dimensions of the rotating reference frame. The electronic controller can further determine flux linkage values for each dimension of the set of dimensions of the rotating reference frame based on the current values using an optimization cost function that accounts for motor speed, copper loss, and core loss. The electronic controller can further determine target flux linkage values for each dimension of the set of dimensions of the rotating reference frame. The electronic controller can then control a power switch network coupled between a power source and the motor based on the flux linkage values and the target flux linkage values.

A discontinuous linear motor system comprises a mover and a motor. The system is controlled by obtaining a set of current values representing current flowing through coils of the motor, wherein a reaction plate of the mover is in a position relative to the coils, obtaining a set of voltage values representing voltage present over the coils, predicting a velocity, acceleration and / or position of the mover from the set of current values and the set of voltage values, and calculating input parameters for control of the motor to move the mover to a desired velocity, based on the prediction. The sets of current and voltage values may be in a rotating reference frame. The sets of current and voltage values may be three-phase values in a stationary reference frame. The step of predicting may comprise applying a trained machine learning model to the sets of current and voltage values, wherein the trained model is configured to output a velocity, acceleration, or position value of the mover.

Systems and methods are provided for controlling and simulating a motor. An electronic motor controller determines present motor information and a motor control parameter set based on the present motor information and a rotating reference frame of the motor. The rotating reference frame has independent input channels that decouple an intended output response in a stator D-axis component and a rotor field (R) component of a direct-quadrature-null-rotor (DQNR) reference frame. The electronic motor controller further controls the motor based on the motor control parameter set.

The invention discloses a permanent magnet synchronous motor harmonic suppression method based on an improved particle swarm algorithm, and relates to the technical field of PMSM harmonic suppression, and the method comprises the steps: S1, obtaining a harmonic current component through the electrical angle and three-phase current of a permanent magnet synchronous motor; s2, constructing an algorithm value function according to the harmonic current component; and S3, obtaining a harmonic suppression result of the permanent magnet synchronous motor based on an improved particle swarm algorithm according to the harmonic current component and the algorithm value function. According to the method, a current component under a rotating reference system is obtained by utilizing multiple synchronous rotating coordinate system transformation, and then a corresponding LPF is selected for filtering so as to extract current harmonics; according to the method, decoupling compensation of current harmonics is carried out by establishing a shift multi-reference system, and compared with other methods, the algorithm is simpler; according to the method, the amplitude and the phase of dead zone compensation by improving the particle swarm optimization are not affected by motor parameters, the iteration speed is high, and the method is not prone to falling into a local optimal solution.

A data communication method for a de-icing system for a turbine engine is disclosed. The turbine engine includes a fixed reference frame and a rotating reference frame. The system includes a non-contact rotating power transformer (RTU), the primary side of which is constrained by the fixed reference frame, and the secondary side of which is constrained by the rotating reference frame. The fixed reference frame includes an ice protection and control unit (IPC) and a power supply device (DC / AC) for supplying AC power to the primary side. The IPC transmits commands to the DC / AC to adjust the level of power supplied to the primary side. The rotating reference frame includes a propeller (1) and a switch, with a plurality of resistors fixed to the propeller. The switch is used to sequentially distribute the power supplied to the secondary side to the resistors. The protection and control unit (IPC) is programmed to transmit switching commands to the switch via the power supply unit (DC / AC) and the transformer (RTU) by issuing instructions (Ic1, Ic2, Ic3, Ic4, Ic5, Intl) to the power supply unit (DC / AC) to encode the voltage wave sequence (To) applied to the primary side. The switch is programmed to decode the voltage wave sequence (To) recovered on the secondary side.

A system for monitoring a three phase AC supply, e.g. in a ship, comprises an analogue to digital converter (ADC) 208 and a means 202 for calculating a direct component d and / or a quadrature component q in a rotating reference frame rotating at the fundamental AC supply frequency using a Park Transform 212a, 212b. The d or q value is then compared against a threshold to detect deviation of the AC waveform from a desired sinusoidal waveform. Electrical equipment may be disconnected if the waveform deviates beyond a predetermined level. The calculation may be performed by a Decoupled Double Synchronous Reference Frame Phase Locked Loop (DDSRF PLL) algorithm. The d or q value may be obtained from a positive sequence Park Transform. Deviation from the desired waveform may be detected by comparing against upper and lower thresholds. In addition, phase error and RMS voltage may be compared against thresholds to determine deviation.

Described is a method of aligning a stationary rotor of a polyphase synchronous motor having a permanent magnet rotor to a configured rotor angle (θ). The method includes determining corresponding polyphase drive voltages for the synchronous motor based on a user-specified value of a two-axis synchronously rotating reference frame vector voltage (V) for a selected one of two axis of the two-axis synchronously rotating reference frame. Then, determining corresponding polyphase drive voltages for the synchronous motor; and applying said polyphase drive voltages for a predetermined, selected, or calculated time period to rotate the stationary rotor to align said rotor with said configured rotor angle (θ).

Techniques for operating an augmented reality (AR) device using a robotic total station (RTS) are described. An RTS reference frame is correlated with an AR reference frame. A set of RTS measurements are received from the RTS including a distance and an angle from the RTS to a reflector of the AR device. An RTS point within the RTS reference frame is determined based on the distance and the angle. An AR point is determined within the AR reference frame based on a set of vision-based or inertia-based measurements. The RTS reference frame and / or the AR reference frame is shifted to align the RTS point with the AR point. The RTS reference frame and / or the AR reference frame is rotated to align an RTS vector formed using the RTS point with an AR vector formed using the AR point.

The application discloses a method for implanting a large deformation plastic element based on FDEM in a non-rotating reference system, which comprises the following steps: obtaining a deformation rate in a rotating configuration and a rotation matrix based on the node coordinates of a triangular element; obtaining the deformation rate in a non-rotating configuration based on the deformation rate in the rotating configuration and the rotation matrix; determining an elastic trial stress, determining a material state in combination with a yield function, obtaining a true stress, and performing rotation mapping of an original reference configuration to obtain a true Cauchy stress; according to FDEM calculation, calculating contact force and force caused by cohesive force elements, and then uniformly converting the contact force and the force into node force; updating the node velocity and the position in the current time step through Newton's second law; and entering the next time step. The application introduces the calculation of a stress tensor in a non-rotating reference system, rotates the stress tensor, maps the stress tensor to the original reference system, and realizes the accurate simulation of plastic behavior in the wired-discrete element in combination with a yield function and a plastic flow rule.

Power conversion systems and methods are provided that use a four-leg power converter and delta-sigma control. Each of the four phase legs includes an LC filter and power switching elements. A control system determines an electrical operational characteristic for each of the four phase legs and generates control reference targets in a stationary reference frame for each phase leg based on the electrical operational characteristics and a rotational reference frame. The rotational reference frame includes a direct axis (d-axis) component, a quadrature axis (q-axis) component, a delta axis (δ-axis) component, and a sigma axis (σ-axis) component. The delta axis component indicates a difference between a common mode and a neutral electrical characteristic, and the sigma axis component indicates a sum of the common mode and the neutral electrical characteristic. The control system drives the power switching elements of the four phase legs in accordance with the control reference targets.

A method of monitoring a three-phase alternating current (AC) signal includes carrying out analog to digital (A / D) conversion of each phase of the AC signal to produce respective digital voltage signals; calculating at least one of a direct component (d) value and a quadrature component (q) value in a rotating reference frame rotating at a fundamental frequency of the AC signal from the digital voltage signals using a Park Transform; comparing the at least one of a d value and a q value to one or more thresholds; and based on the result of the comparing, detecting deviation of the AC signal from a desired waveform.

Disclosed is a method for communicating data for a system for de-icing a turbomachine that comprises a fixed reference frame and a rotating reference frame, the system comprising a contactless rotating electrical transformer (RTU) a primary of which is tied to the fixed reference frame and a secondary of which is tied to the rotating reference frame, the fixed reference frame comprising an ice protection and control unit (IPC) and a power supply device (DC / AC) for supplying an AC current to the primary, the protection and control unit (IPC) transmitting instructions to the power supply device (DC / AC) to adjust a level of electric power delivered to the primary, the rotating reference frame comprising a propeller (1) to which resistors are secured, and a switch for sequentially distributing, to the resistors, electric power that is transmitted to the secondary. The protection and control unit (IPC) is programmed to transmit switching orders to the switch via the power supply device (DC / AC) and the transformer (RTU), by giving the power supply device (DC / AC) instructions (Ic1, Ic2, Ic3, Ic4, Ic5, Intl) to encode a train of voltage waves (To) applied to the primary, the switch being programmed to decode the train of voltage waves (To) recovered at the secondary.

This invention relates to the field of wind turbine maintenance, specifically to a de-icing jet control method and system for a rotating blade de-icing robot. The control method acquires the comprehensive external load vector in a rotating reference frame in real time and estimates the transient recoil vector of the pulsed jet, calculating the jet phase window that meets the fuselage adhesion torque margin requirements. During the de-icing operation within this window, the control fluid distribution component synchronously guides the high-pressure fluid to the first injection end for de-icing and to the second injection end, thereby generating transient aerodynamic downpressure within the omnidirectional convergent surface of the fuselage belly, achieving a dynamic balance between jet flow and recoil. This solution, through the coordinated control of aerodynamic stabilization and mechanical compensation, effectively mitigates the nose-up, overturning, and yaw tendencies caused by high-pressure pulses, significantly improving the adhesion reliability and operational accuracy of the lightweight robot under rotating variable load and variable curvature blade environments, without requiring additional fuselage mass.

The present invention discloses a frequency-locked loop and a power grid state tracking method based on a discrete three-phase second-order generalized integrator, including a Clark converter, two discrete second-order generalized integrator prefilters in parallel rotating reference axis directions, a discrete frequency-locked loop system with normalization, a positive and negative sequence calculator, and a Clark inverse converter. The present invention first performs discretized prefiltering in two directions perpendicular to the three-phase voltage rotating reference system through a discrete three-phase second-order generalized integrator frequency-locked loop to obtain two pairs of orthogonal fundamental component sequence signals, obtains a frequency estimation signal after processing through a discrete frequency-locked loop, and then transmits it to the prefilter to form a closed-loop system to estimate the frequency. The present invention not only tracks the fundamental frequency of the three-phase power grid more accurately, but also can obtain more accurate fundamental positive and negative sequence fundamental voltages in a stationary reference system, thereby observing whether the power grid has a fault or imbalance, and allowing energy storage to make a coordinated response to power grid systems in different states.

Systems and methods for motor control using segmented affine modeling are disclosed. The electronic controller may determine a current value of the electric machine in the rotating reference frame. Each current value may be associated with a dimension of a set of dimensions of the rotating reference frame. The electronic controller may further determine a flux linkage value for each of a set of dimensions of the rotating reference frame using a segmented affine mapping based on the current values. The electronic controller may further determine a target flux linkage value for each of a set of dimensions of the rotating reference frame. The electronic controller may further control a power switching network coupled between the power source and the electric machine based on the flux linkage value and the target flux linkage value.

Disclosed are systems and methods for motor control using piecewise affine modelling. An electronic controller may determine current values for a motor in a rotational reference frame. Each current value may be associated with a dimension of a set of dimensions of the rotational reference frame. The electronic controller may further determine, based on the current values, a flux linkage value for each of the set of dimensions of the rotational reference frame using a piecewise affine map. The electronic controller may further determine a target flux linkage value for each of the set of dimensions of the rotational reference frame. The electronic controller may then control a power switching network coupled between a power supply and the motor based on the flux linkage values and the target flux linkage values.

The present invention relates to a pitch-change mechanism for a turbine engine propeller, said turbine engine comprising a stator portion and a rotor portion, said pitch-change mechanism comprising an electrohydraulic actuator comprising: —a cylinder for actuating the propeller, comprising a first chamber and a second chamber; —a hydraulic pump suitable for selectively supplying the first chamber or the second chamber of the cylinder with pressurized hydraulic fluid; —a hydraulic fluid reservoir configured to store a pressurized hydraulic fluid; —a valve controlled between a first position in which the valve places the first chamber of the cylinder in fluid communication with the hydraulic pump, and a second position in which the valve places the first chamber of the cylinder in fluid communication with the hydraulic fluid reservoir.

In one embodiment, the method includes i) obtaining target data specifying desired operating parameters of a switched reluctance motor, ii) obtaining data indicative of a value of a measured drive current for each of the phase outputs of an associated inverter, iii) converting the measured drive current values from a stationary reference frame into reference current values in a rotating reference frame, iv) generating, based on the reference current values and the target data and the set of inductance values, updated reference voltage values in the rotating reference frame, v) converting the updated reference voltage values from the rotating reference frame into updated voltage values in the stationary reference frame, and vi) controlling the inverter to set the voltages of the phase outputs to the updated voltage values.

Disclosed are systems and methods for motor control using piecewise affine modelling. An electronic controller may determine current values for a motor in a rotational reference frame. Each current value may be associated with a dimension of a set of dimensions of the rotational reference frame. The electronic controller may further determine, based on the current values, a flux linkage value for each of the set of dimensions of the rotational reference frame using a piecewise affine map. The electronic controller may further determine a target flux linkage value for each of the set of dimensions of the rotational reference frame. The electronic controller may then control a power switching network coupled between a power supply and the motor based on the flux linkage values and the target flux linkage values.

A wind turbine comprising a hydraulic system having a hydraulic fluid supply system located in a stationary reference frame, and a hydraulic fluid using system located in a rotary reference frame. A rotary union module is provided for conveying hydraulic fluid between the stationary reference frame and the rotating reference frame. The rotary union module comprises: a rotary union module having a stationary component providing a stationary hydraulic coupling in communication with the hydraulic fluid supply system, and a rotatable component providing a rotatable hydraulic coupling communicating with the hydraulic fluid using system. An adapter is provided which is configured to join to the rotary union module at the rotatable component. The adapter comprises a module-side coupling configured to interface with the rotatable hydraulic coupling of the rotary union module and a pipe-side coupling configured to interface with at least a first hydraulic pipe, wherein the adapter is provided with a first conduit extending between the pipe-side coupling and the module-side coupling, and wherein the adapter further comprises a drain passage that extends from a tapping point at the first conduit. The drain passage may be configured to lead to a low-pressure drain area such as a tank or low-pressure side of a fluid pump.