To drive the PMBLDC motor, for the conventional 120-degree commutation, the winding without phase current in each conduction interval can be considered as a sensor for back-emf detection. However, in the case of 180-degree commutation, the back-emf detection cannot be realized because all the three phases conduct current in each interval and no back-emf signals are available on stator terminals, which is the reason why the 180-degree sensorless commutation has not been considered so far. In this thesis, a novel 180-degree sensorless system for a PMBLDC motor is proposed. The position and speed information are estimated based on the back-emf signals, which are estimated from the simple sensing of the stator terminal voltage and phase current signals. Each phase of the conventional 120-degree rotates only 120 degrees with current to generate torque and waits for next excitation in the other 60 degrees without torque generated. However, each phase of the proposed 180-degree sensorless system conducts current for the entire electrical period, which produces more torque. The comparison between the 120-degree and the 180-degree sensorless system is also investigated.
| Autorius: | Boyang Hu, Yash Shrivastava, Swamidoss Sathiakumar, |
| Leidėjas: | LAP Lambert Academic Publishing |
| Išleidimo metai: | 2012 |
| Knygos puslapių skaičius: | 128 |
| ISBN-10: | 3659167827 |
| ISBN-13: | 9783659167829 |
| Formatas: | Knyga minkštu viršeliu |
| Kalba: | Anglų |
| Žanras: | Nanotechnology |
Parašykite atsiliepimą apie „A Sensorless Drive System of BLDC Motor: Analysis,simulation and implementation of a new sensorless system for BLDC motors with the 120/180-degree commutations“
