2 results about "Stator voltage" patented technology

The invention relates to a detection method capable of monitoring an incipient failure of an asynchronous motor rotor in an on-line way by a non-intrusive mode, and belongs to the technical field of detection. In order to achieve effective detection of the incipient failure of the asynchronous motor rotor and improve the safety, the reliability and the operation and maintenance efficiency of a motor system, the invention discloses a non-intrusive incipient failure detection method of the asynchronous motor rotor. According to the method, a motor stator voltage / current is used as an informationsource of failure detection, the information source is sent to an upper computer software operation system taking Labvie as a core for analysis after acquisition of a data acquisition card, and the functions o real-time acquisition of a voltage / current signal, failure detection and identification, remote and on-line monitoring and the like can be achieved. By the method, the problem of a traditional rotor fault detection method is solved, and meanwhile, a failure detection technology is also pushed to be developed in an intelligent detection direction with real-time, on-lime and remote-movingway.

The invention discloses a position sensorless control method, device and system for a permanent magnet synchronous motor with an LC filter, and the method comprises the steps: obtaining the observation values of the alpha-axis component and the beta-axis component of the stator voltage of the permanent magnet synchronous motor in the kth sampling period according to the alpha-axis component and the beta-axis component of the inverter side voltage in the (k-1) th sampling period and the (k-2) th sampling period; obtaining the stator current of the permanent magnet synchronous motor according to the inverter side current and the LC filter capacitor fundamental wave current; observation values of alpha-axis and beta-axis components of stator voltage of the permanent magnet synchronous motor and stator current of the permanent magnet synchronous motor in the kth sampling period are calculated, and an estimated value of extended counter electromotive force of the permanent magnet synchronous motor is observed; and according to the estimated value of the extended counter electromotive force of the permanent magnet synchronous motor, obtaining the estimated electrical angular velocity and electrical angle of the permanent magnet synchronous motor. According to the invention, the long-line effect influence caused by high frequency of power electronics is effectively solved through the LC filter, position-sensorless control can be realized, the cost of the control system is effectively reduced, and the reliability of the system is improved.