Fine self-tuning method of both current sensor offset and electrical parameter variations for SPM motor

The servo system of a permanent magnet (PM) motor is always required to maintain fine torque and speed response. The current-control system is designed by using the electric parameters of the PM motor. However, motor parameters vary and the current sensors have offset values. When each U-phase and V-phase current sensor has an offset value, the PM motor servo system has the torque ripple and cannot accurately identify the motor parameters. In this paper, we propose a new online-estimation method for both current-sensor offsets and electrical parameters for PM motors by using a current simulator. The experimental results confirm that the proposed method accurately estimates both the U-phase and V-phase current sensor offsets, the motor resistance Ra, the motor inductance La, and carries out the fine self-tuning for the current controller of PM motor servo system.

[1]  K. Ohishi,et al.  Current sensor-less speed servo system of PM motor based on self-tuning current simulator , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[2]  Kiyoshi Ohishi,et al.  High-performance speed servo system considering Voltage saturation of a vector-controlled induction motor , 2006, IEEE Transactions on Industrial Electronics.

[3]  Kiyoshi Ohishi,et al.  The Identification Method of Electrical Parameters of PM Motor Without Current Sensor and its Application to Servo System , 2005 .

[4]  K. Ohishi,et al.  High performance current sensorless speed servo system of PM motor based on current estimation , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[5]  K. Kamiyama,et al.  Fully digital, vector-controlled PWM VSI-fed AC drives with an inverter dead-time compensation strategy , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[6]  Bimal K. Bose,et al.  Power Electronics and Variable Frequency Drives , 1996 .

[7]  Kiyoshi Ohishi,et al.  Fine estimation & self-tuning of both current sensor offset and electrical parameter variation for PM motor , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

[8]  Kiyoshi Ohishi,et al.  Self-tuning control of both current sensor offset and electrical parameter variations for PM motor , 2010, 2010 11th IEEE International Workshop on Advanced Motion Control (AMC).

[9]  M. Sato,et al.  High efficient parallel-connected induction motor speed control with unbalanced load condition using one inverter , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).