Wolong Electric Group Co. Ltd.

Great Lakes Electric, LLC

Ze Jiang

Zheng Zhang

Radu Bojoi

Yifeng Yu

Steve J Cook

Systems and methods for robust control of a sensorless interior permanent magnet synchronous motor during severe operating conditions that causes motor parameter variation. A multi-model flux observer and a dynamic direct flux motor controller act in concert to generate driving commands. The flux observer transitions between providing flux-based rotor characteristic estimates based on different motor models. DHFI filtered currents can be utilized to obtain flux-based characteristic estimates using a motor magnetic model that are unaffected by motor parameter variations. The multi-model flux observer can be configured to transition between suitable estimation methods to reduce, minimize, or eliminate the effects of motor parameter variations.

Systems and methods for interior permanent magnet synchronous motor control

A robust starting system and method for an interior permanent magnet synchronous motor, suitable for commercial fan and blower drive applications. A comprehensive starting control process is provided that utilizes control flags to implement closed-loop control accounting for any pre-existing rotor movement, controlling the motor speed from an initial speed to a destination speed. A universal dqController provides selective configurability for collecting information regarding the initial state of the motor, as well as starting and operational motor control. Dynamic high frequency injection enables the use of HFI outside the normal standstill motor speeds by intelligently decoupling the high frequency and rotor movement portions of the stator current response.

Robust starting system and method for interior permanent magnet synchronous motor control

A system and method for robust control of a sensorless interior permanent magnet synchronous motor. The system and method includes rotor characteristic detection to detect or estimate rotor position, rotor speed, and rotor magnetic polarity based on rotor magnetic anisotropy or saliency. Detecting rotor magnetic polarity allows determination of orientation of the rotor and, for a rotor in motion, direction of travel. A high frequency injection enables rotor position detection and an alternating carrier method enables detection of rotor magnetic polarity. The system and method can also include closed loop startup control from a standstill condition following detection of rotor characteristics.

System and method for interior permanent magnet synchronous motor control from zero or low speed

Systems and method for retrofitting heating, ventilation and air-conditioning (HVAC) systems with a variable speed electronically commutated motor (ECM) are provided. A speed setting controller is adapted to be connected with a furnace main control board and a motor controller, and provides detecting, speed setting, and control functions that are required to operate the ECM.

Growing community of inventors

Zejiang, China

Ze Jiang