Sensorless commutation of printed circuit brushless direct current motors

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Sensorless commutation of printed circuit brushless direct current motors

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The reliability and overall cost of brushless direct current (BLDC) motors can be significantly improved by implementation of an effective sensorless commutation control method. A recently proposed technique termed the ‘equal inductance method’ offers commutation control and starting performance equal to that obtained when using Hall sensors. However, the method applies to nominally symmetrical machines with high enough phase winding time constants. This study is about sensorless commutation of a class of motors which is characterised by significant asymmetry and relatively low-phase winding time constants. The motors in question are axial flux machines with ironless stators that may be wound or made up of printed circuits. The basic reason for the asymmetry is that the three-stator phases are stacked with each one of them located at a different axial distance from the rotor. The low-phase time constant is due to the ironless nature of the stator. The focus is on the printed circuit version of the motor. A new sensorless commutation technique has been developed, which is effectively a generalisation of the originally proposed equal inductance method. The theoretical basis behind the technique and practical results demonstrating its effectiveness are presented.

Inspec keywords: sensorless machine control; stators; rotors; printed circuit motors; commutation; brushless DC motors

Other keywords: axial flux machines; BLDC motors; ironless stators; printed circuit brushless direct current motors; phase winding time constants; sensorless commutation control method; equal inductance method; rotor

Subjects: Control of electric power systems; d.c. machines; Small and special purpose electric machines

References

    1. 1)
      • S. Bolognani , R. Oboe , M. Zigliotto . Sensorless full-digital PMSM drive with EKF estimation of speed and rotor position. IEEE Trans. Ind. Electron. , 1 , 184 - 191
    2. 2)
      • D. Gambetta , A. Ahfock . A new sensorless commutation technique for brushless DC motors. IET Electr. Power Appl. , 1 , 40 - 49
    3. 3)
      • M. Tsai , L. Hsu . Design of a miniature axial-flux spindle motor with rhomboidal PCB winding. IEEE Trans. Magn. , 10 , 3488 - 3490
    4. 4)
      • Prokop L.: ‘3-phase BLDC motor control with sensorless back-EMF ADC zero crossing detection using the 56F805, Designer reference manual’. Motorola Czech System Laboratories, Roznov pod Radhostem, Czech Republic, 2003.
    5. 5)
      • G.H. Jang , J.H. Chang . Development of an axial-gap spindle motor for computer hard disk drives using PCB winding and dual air gaps. IEEE Trans. Magn. , 5 , 3297 - 3299
    6. 6)
      • S. Kim , S. Sul . New approach for high-performance PMSM drives without rotational position sensors. IEEE Trans. Power Electron. , 5 , 904 - 911
    7. 7)
      • D. Gambetta , A. Ahfock . Designing printed circuit stators for brushless permanent magnet motors. IET Electr. Power Appl. , 5 , 482 - 490
    8. 8)
      • E. Robeischl , M. Schroedl . Optimized INFORM measurement sequence for sensorless PM synchronous motor drives with respect to minimum current distortion. IEEE Trans. Ind. Appl. , 2 , 591 - 598
    9. 9)
      • P. Ryff . (1988) Electric machinery.
    10. 10)
      • 56F8037, ‘Technical Data’, REV. 5, Freescale.com, 03/2008.
    11. 11)
      • Baudot, J.H.: `Rotating electric machines with printed circuit windings', Patent Number 3144574, 11 August 1964, United States Patent Office.
    12. 12)
      • T.S. Low , M.A. Jabbar , T.S. Tan . (1995) Design aspects and performance of slotless PM motor for hard disk drives.
    13. 13)
      • Swiggett, R.L.: `Printed circuit armature', Patent Numbers 2970238, 2970238, 31 January 1961, United States Patent Office, Patented on.
    14. 14)
      • Gambetta, D.: `Sensorless technique for BLDC motors', 2006, Master of Philosophy, University of Southern Queensland.
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