Implementation of sensorless drive technology for the BLDC motor

• Main Authors: Szu-Ying Cheng, 程思穎
• Other Authors: Yon-Ping Chen
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/99872211188204882752

碩士 === 國立交通大學 === 電機與控制工程系所 === 94 === Nowadays, the BLDC motor becomes more and more attractive and be applied to many applications since it is easy to control and with high power density and high efficiency. Conventionally, the Hall-effect sensors are needed in electrical commutation. However, the Hall-effect sensors have several disadvantages, such as cost, size and reliability. Therefore, the sensorless control methods have been widely investigated in recent years. This thesis analyzes and then realizes a sensorless drive for the BLDC motor with the position estimated method to control the motor from standstill to the desired speed. In addition, the start-up problem existing in the back-EMF based method has been overcome simply by the initial position detection. Once the initial rotor position is attained, the motor can be driven from standstill effectively by a modified open-loop method. Finally, experimental results are included to demonstrate the success of the proposed sensorless control algorithm.