Technology hotspot application field
From the specific application of radio frequency identification technology in the field of electric motors, it mainly focuses on the following aspects:
First, the use of radio frequency wireless communication functions to transmit a variety of signals. For example, Dyson Technology Co., Ltd. of the United Kingdom submitted a patent application involving a motor control method in January 2005, which uses a radio frequency signal to send a motor angle correction factor to the controller to compensate for the desired input power and the measured input power. The difference is such that the phase winding is excited according to a predetermined advance angle curve. In May 2007, Lutron Electronics Corporation of the United States submitted a patent application for electric roller blinds involving radio frequency control, which uses radio frequency transmission to provide wireless communication between control devices, improving the shielding of RF signals by metal reels and the interior of the motor. The effects of source noise provide an antenna that allows reliable communication with the RF transceiver, ensuring reliable RF communication between the controller and other control devices within the metal spool of the motorized roller blind.
Second, the use of radio frequency identification technology to measure the internal discharge information of the motor. As mentioned earlier, Westinghouse Electric Company has filed a patent application for a method and apparatus for determining whether a motor is truly faulty by detecting a radio frequency signal in a motor, where the line voltage or current of the generator exceeds a specified threshold value. Then, when the second radio frequency signal exceeding the threshold value appears again within a prescribed time period, the generator is instructed to malfunction, and the false alarm of the generator failure is avoided. In March 2007, SKF Sweden submitted a patent application for indicating a method of discharge in a non-conducting medium between a race and a rolling element in a bearing of an electric drive system, which is transmitted by a telemetry electric drive system A radio frequency signal comprising a radio frequency signal associated with a discharge in a non-conductive medium, processing the detected radio frequency signal to predict a discharge, and indicating a predicted discharge. In July 2009, ABB Ltd. of Finland submitted a patent application for a new method and a new device for measuring the bearing current in a motor by detecting the RF signal caused by the discharge. The method generates a synchronization signal, which can be generated with the bearing current. Any signal associated with the source triggers the RF signal detecting device as a response to the synchronization signal, recording a radio frequency signal that matches the synchronization signal as a signal representative of the bearing current.
Third, the use of radio frequency identification technology for motor rotor position, temperature and other data detection. For example, in August 2009, Silicon Valley Micro M Co., Ltd. filed a patent application for a brushless DC motor based on radio frequency identification technology for rotor magnet position sensing. A plurality of magnets on the rotor of the motor are fixed with RFID tags. Each RFID tag stores a unique identification character for identifying the magnet. A plurality of RFID interrogation antennas are mounted in the stator teeth of the motor for providing an RF interrogation signal. The position and the magnet identification signal are received by the RFID reader, and the RFID reading is performed. This information is processed and sent to the motor controller and driver unit to provide information for the motor's power commutation control. In September 2011, General Electric Company of the United States filed a patent application for a real-time measurement system involving a rotor surface, which placed an RFID tag with an integrated sensor on the rotor to measure various operational data from the rotor.
Fourth, the use of radio frequency identification technology for turbine rotor blade calibration and monitoring. For example, in August 2009, the Vestas Wind Systems Group of Denmark filed a patent application for a calibration method using radio frequency identification tags to mark the angular position of a rotor blade of a wind turbine generator. The calibration method calibrates the rotor blade pitch by a contactless sensing position between the RFID tag disposed on the rotor blade and the sensor on the hub. In March 2010, General Electric Company of the United States submitted a patent application for a method and system for turbine blade monitoring. The method and system mainly solve the problem of state monitoring of turbine blade rotor blades during operation, and the method and system can be used to obtain turbine operation. At the same time, the precise way of monitoring and obtaining the robustness of the rotor blades is avoided to avoid catastrophic damage to the turbine engine caused by some blade failures.
