32 results about "MRAS" patented technology

The invention discloses a rotary speed estimation method for a bearingless asynchronous motor, and provides a rotary speed detection system and method for the bearingless asynchronous motor and based on POPOV hyper-stability so as to solve the problem of inaccurate rotary speed identification of the current bearingless asynchronous motor. Two sets of rotor magnetic linkage voltage model observation values are obtained according to actually measured stator voltage and current signals through a magnetic linkage observer formed by a common integrator and a magnetic linkage observer formed based on an improved second-order generalized integrator; the observed rotor magnetic linkage is used as a reference value; and the rotor magnetic linkage is solved by a rotor magnetic linkage current model to be used as an adjustable value to form two sets of rotor magnetic linkage-based model reference adaptive systems (MRAS). Through a proper adaptive law, the rotary speed of the bearingless asynchronous motor is identified; then a proper rotary speed identification observer is controlled to be selected through a regulation and control module to obtain an accurate real-time rotary speed value; and the invention does not give unnecessary details on a suspension force control part of the bearingless asynchronous motor.

The invention discloses a fuzzy-control-improved permanent-magnet-motor speed-less speed measurement system. The fuzzy-control-improved permanent-magnet-motor speed-less speed measurement system comprises a PMSM module, a Clark conversion module, a Park conversion module, a voltage-and-current conversion module, an MRAS module, a first comparator module, a fuzzy controller module, a second comparator module, a first PI adjusting module, a third comparator module, a second PI adjusting module, a Park inverse conversion module, an SVPWM module and an inverter module; the fuzzy-control-improved permanent-magnet-motor speed-less speed measurement system is used for detecting the position and the speed of a motor; in the actual running process, model reference self-adaptive control is that the actual running condition of the motor serves as a reference model, a motor model containing parameters such as the to-be-estimated rotating speed and a current serves as an adjustable module, an equation free of an unknown parameter serves as a reference model, the adjustable module is adjusted through a difference value between an actual measurement current and an estimated current of the motor, the estimated value tracks the actual value, an output difference value of the two models tends to be zero, and therefore the aim of the rotor stably runs is achieved.

The invention discloses a position sensorless control method for a permanent magnet synchronous motor based on a simplified MRAS method, which belongs to the field of motor control systems and includes the following steps: S1: constructing a reference model of a permanent magnet synchronous motor position sensorless identification system based on the MRAS method and Adjustable model, S2: Constructing the IPMSM position identification system based on MRAS method, S3: Performing simulation analysis on the constructed IPMSM position identification system based on MRAS method, S4: Constructing an improved system with no position sensor algorithm after adding resistance identification, S5 : Simulate and analyze the improved system without position sensor algorithm after adding resistance identification. The position sensorless control method of permanent magnet synchronous motor based on the simplified MRAS method is more scientific and reasonable. On the premise of not affecting the control effect, the MRAS method is simplified and stator resistance identification is added, which makes the motor model more accurate and improves the rotor position identification. precision.