Sensorless Vector Control for Automotive Auxiliary Motors in the Full Speed Range

Self-Balancing Control of Yarn Number Based on a Novel Sensorless PMSM Speed Drive System

“…At present, the sensorless control technologies of PMSM can be divided into three methods. The first method was used for the medium-high speed operation [16][17][18][19]; the second method was used for the low-speed operation [20][21][22][23]; the third method was the hybrid control method integrating the former two methods [24][25][26].…”

“…In order to realize the sensorless control of PMSM in the full-speed range, the hybrid control methods integrating the above two methods are proposed. For example, a hybrid control method for the electric vehicle oil pump motor was proposed in [24], which contains an IF control at low-speed and a model reference adaptive control at medium-high speed; a smooth switching strategy from the low-speed to medium-high speed is designed. A hybrid control method for the fan motor was also proposed in [25].…”

“…When the number of yarn input and output varies greatly, the motor needs high speed and high dynamic response to realize yarn self-balancing tracking. However, the above hybrid control methods [24][25][26] have problems of poor low-speed estimation performance, limited speed range, and low dynamic response, which cannot meet the working conditions of the weft accumulator. In addition, the weft accumulator also needs to control the yarn number with high-precision, but the existing PMSM sensorless systems only control the speed and do not have the control capability of high-precision tracking of the yarn number.…”