Brushless Direct Current(BLDC) Motor is essential to measure a rotor position because of that this motor type needs to synchronize the rotor`s position and changeover phase current instead of a brush and commutator used on the existing dc motor. Recently, many researches have studied on sensorless control drive for BLDC motor. The conventional control methods are a compensation value dq, Kalman filter, Fuzzy logic, Neurons neural network, and the like. These methods has difficulties of detecting BEMF accurately at low speed because of low BEMF voltage and switching noise. And also, the operation is long and complex. So, it is required a high-performance microprocessor. Therefore, it is not suitable for a small BLDC motor sensorless drive. This paper presents control methods suitable for economic small BLDC motor sensorless drive which are an improved design of the BEMF detection circuit, simplifying a complex algorithm and computation time reduction. The improved motor sensorless drive is verified stability and validity through being designed, manufactured and analyzed.
[1]
Chung-Yuen Won,et al.
Rotor Position Estimation of 3-Phase PM BLDC Motor by 2Hall-IC, 1Hall-IC
,
2006
.
[2]
Kouhei Ohnishi,et al.
Microprocessor-Controlled DC Motor for Load-Insensitive Position Servo System
,
1985,
IEEE Transactions on Industrial Electronics.
[3]
Young-Cheol Lim,et al.
A Study on low-Cost Sensorless Drive of Brushless DC Motor for Compressor Using Random PWM
,
2008
.
[4]
Kenichi Iizuka,et al.
Microcomputer Control for Sensorless Brushless Motor
,
1985,
IEEE Transactions on Industry Applications.
[5]
N. Matsui,et al.
Brushless DC motor control without position and speed sensors
,
1990,
Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.