6 results about "Rotating reference frame" patented technology

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 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.

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).

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.

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.