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Low Cost Sensor-Less Control of Permanent Magnet Synchronous Motor for Home Appliances

Hosseinyar, Hossein | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51572 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tahami, Farzad
  7. Abstract:
  8. Proper operation of a permanent magnet synchronous motor (PMSM) requires rotor position information. Commonly a rotor position sensor, such as optical encoder or resolver, is used for this purpose. These sensors add cost, weight and degrade reliability of the drive system. Using position and speed sensors for control of PMSM’s in home appliances is not cost effective. In this thesis, a novel method for predicting position of the rotor and winding inductance of the permanent magnet synchronous machine has been presented. In this method, machine anisotropy is utilized for rotor position estimation purposes like what in the high frequency injection techniques. Each leg of the PWM inverter consist a specific wave with unique characteristics such as phase and frequency. This discrepancy creates different harmonics in current of the stator, which contain information about angle of the rotor. Unlike previous high frequency injecting methods, after separation of the high frequency signals from the power string, only amplitude of these signals are required for predicting mechanical and electrical parameters of the electric machine. Amplitude variation rate of these signals are proportional with the double electrical speed of the rotor. Hence, sensorless controlling can be achieved with low frequency sample rate. Low sample rate reduces calculation burden of the digital signal processor and therefore cost of the processor will be reduced. Also, because there is no added voltage in the stator, the inverter can reach its maximum rated voltage
  9. Keywords:
  10. Sensorless Speed Control ; Parameter Estimation ; Permanent Magnet Synchronous Machine ; High Frequency Signal Injection

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