| A Sensorless Drive System of BLDC Motor Contributor(s): Hu, Boyang (Author), Shrivastava, Yash (Author), Sathiakumar, Swamidoss (Author) |
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ISBN: 3659167827 ISBN-13: 9783659167829 Publisher: LAP Lambert Academic Publishing OUR PRICE: $60.53 Product Type: Paperback Published: July 2012 |
| Additional Information |
| BISAC Categories: - Technology & Engineering |
| Physical Information: 0.3" H x 6" W x 9" (0.44 lbs) 128 pages |
| Descriptions, Reviews, Etc. |
| Publisher Description: 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. |
