New Three-Phase Current Reconstruction for PMSM Drive With Hybrid Space Vector Pulsewidth Modulation Technique

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Abstract
Current sensing techniques with reduced number of sensors attract a high interest from industry, for the possibility of cost reduction and sampling mismatch reduction. This paper puts forward a new single current sensor (SCS) method for a permanent magnet synchronous motor (PMSM) three-phase current reconstruction, with a novel hybrid pulse width modulation technique introduced. This method is implemented by changing the position of SCS from dc bus to a current branch, and a modified space vector pulse width modulation (SVPWM) technique is employed to realize the phase current reconstruction. Compared with traditional SCS control methods, the proposed method can relieve the measurement dead-zones (MDZs) at sector boundary region without introducing extra compensation algorithms. Besides, this method can be realized not only with a single hall-effect current sensor but also a single shunt resistor, which further expands the applications and increases the system reliability as well. This method is also available in other motor control with a two-level three-phase PWM Voltage Source Inverter (VSI) topology. The accuracy and feasibility of the proposed method is validated by the simulation and experimental results.
Funding Information
  • National Natural Science Foundation of China (51807099)

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