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This paper investigates the restart performance of sensorlessly controlled IPMSM Fan motor free-running in middle or high speed range just after inverter power off. There could be some difficulties to extract exact position information by using conventional sensorless control for restarting the motor because of stopped inverter operation. To solve this problem, we proposes to use low cost hall sensor. Using a hall sensor with SMO (Sliding Mode Observer) give us a solution to facilitate rotor position information extraction. The algorithm in this paper shows a certain way of the restarting method. **†() :   E-mail : yousjung@pknu.ac.kr, Tel : 051-629-6165 * :   **†Y. S. Jung(corresponding author) : Department of Mechanical & Automotive Engineering, Pukyong National University. E-mail : yousjung@pknu.ac.kr, Tel : 051-629-6165 *J. H. Lee : Department of Mechanical & Automotive Engineering, Pukyong National University.. 1.       ,     , ,      .          . /          .  12V                 . /  IPMSM (Interior permanent magnet synchronous motor)    .             .         BLDC     PMSM     . BLDC                     .   IPMSM             ,            .            .   [5] d q    IPMSM  SMO      IPMSM    .     (          )          SMO     IPMSM     ·   74              .       IPMSM        (  10% )                .  60                  .            .          . 2. SMO(Sliding mode observer)    2.1 IPMSM  2.1.1 IPMSM   Fig. 1 2 IPMSM   .  3 Y       120°   .   a,b,c     d  q . Fig. 1 Equivalent model of IPMSM Fig. 1      ,  ,     120°   . 2.1.2 IPMSM    IPMSM 3      .             (1)       ,    : 3    :      : 3      :   (1) IPMSM 3   2      (2)   .                                          (2)  (2),  :     : d, q     : d, q     : d, q   :    . 2.2 SMO           SMO    . Fig. 1   d, q         .                     .            .  (2)      (3)  .                                            (3)           (4)   (3)      .                                   (5)

Improvement of Middle or High Speed Restart Performance Using Hall Sensor for the Sensorlessly Controlled IPMSM Fan motor