Consideration of the Carrier Based Signal Injection Method in Three Shunt Sensing Inverters for Sensorless Motor Control

Sungho Jung; Jung-Ik Ha

Consideration of the Carrier Based Signal Injection Method in Three Shunt Sensing Inverters for Sensorless Motor Control

Sungho Jung

Jung-Ik Ha

Vol. 16, No. 5, pp. 1791-1801, Sep. 2016

10.6113/JPE.2016.16.5.1791

AC motor

Phase current reconstruction

Sensorless control

Signal injection

Three shunt sensing inverter

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Abstract

This paper considers a carrier based signal injection method for use in the three shunt sensing inverter (TSSI) for sensorless motor control. It also analyzes the loss according to the injection axis of the voltage signal. To remove both the phase current and rotor position sensors, a sensorless method and a phase current reconstruction method can be simultaneously considered. However, an interaction between the two methods can be incurred when both methods inject voltage signals simultaneously. In this paper, a signal injection based sensorless method with the 120° OFF Discontinuous PWM (DPWM) is implemented in a TSSI to avoid this interaction problem. Since one leg does not have a switching event for one sampling period in the 120º OFF DPWM, the switching loss is altered according to the injection axis. The switching loss in the d-axis injection case can be up to 32% larger than that in the q-axis injection case. Other losses according to the injection axis are also analyzed.

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Cite this article

[IEEE Style]

S. Jung and J. Ha, "Consideration of the Carrier Based Signal Injection Method in Three Shunt Sensing Inverters for Sensorless Motor Control," Journal of Power Electronics, vol. 16, no. 5, pp. 1791-1801, 2016. DOI: 10.6113/JPE.2016.16.5.1791.

[ACM Style]

Sungho Jung and Jung-Ik Ha. 2016. Consideration of the Carrier Based Signal Injection Method in Three Shunt Sensing Inverters for Sensorless Motor Control. Journal of Power Electronics, 16, 5, (2016), 1791-1801. DOI: 10.6113/JPE.2016.16.5.1791.