4 results about "Stationary Reference Frame" patented technology

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.

This invention proposes a sensorless multi-vector predictive control method and system for permanent magnet synchronous motors (PMSMs), belonging to the field of measurement and predictive control technology for PMSMs. The method includes: obtaining a current prediction equation based on the discrete-domain voltage response equation of the motor; approximating a reference voltage vector using two adjacent commutation vectors and assigning them respective application times, designated as the first application time and the second application time; constructing a quadratic cost function and solving for the optimal application time; defining the injected high-frequency voltage signal, obtaining the injected signal representation in the stationary reference frame, determining the sector where the injected signal is located, and determining the application times of two adjacent vectors within that sector; obtaining the generated high-frequency current response representation after the voltage signal is injected, and obtaining the rotor position error based on the high-frequency current response representation; and using coherent demodulation technology to extract the observation error.

Various examples are provided related to fault detection of power converters. In one example, a method includes sensing phase currents of a three-phase transformer; determining a centroid vector in an alpha-beta stationary reference frame based upon averaged values of the sensed phase currents; identifying a fault on a side of the transformer based upon a location of the centroid vector within the alpha-beta stationary reference frame, the location defined by a magnitude and an angle of the centroid vector; and adjusting operation of the power converter in response to the identified fault. In another example, a power converter includes a three-phase transformer connected between primary and secondary side three-phase bridges and control circuitry that can determine a centroid vector based upon sensed phase currents; identify a fault on a side of the three-phase transformer; and adjust operation of the power converter in response to the identified fault.

The invention discloses a non-contact dynamic weighing system and method based on magnetic sensing, the system comprises a bearing unit, an elastic deformation unit, a magnetic field generation unit, a magnetic sensing array unit and a signal processing and control unit, the bearing unit is used for contacting with a measured object and bearing the load of the measured object; the elastic deformation unit is connected between the bearing unit and an external static reference frame; and the magnetic field generating unit is fixed on a component which moves along with the bearing unit and is used for generating a stable magnetic field. According to the non-contact dynamic weighing system and method based on magnetic sensing disclosed by the invention, the problems that the existing dynamic weighing technology is easily interfered by the environment, the service life of a sensor is short, the installation and maintenance cost is high, the measurement precision is low and the anti-interference capability is poor are solved, non-contact dynamic weighing is realized, and the stability, repeatability and intelligent level of the weighing system are improved.