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The speed and position estimation from Back EMF has been a problem under speed reversal response due to change of sign of speed. In this paper, an algorithm using fuzzy logic is proposed to estimate the speed and position of BLDC motor from back EMF for sensorless brushless DC (BLDC) motor drives to improve the performance of conventional sensorless drives. Most existing sensorless methods of the...
Brushless DC (BDC) motors are widely used in aerospace applications because of their high power to weight ratio, low maintenance and reliable operation over long periods of time. These advantages also make them preferred over brushed DC motors for several other applications. But the requirement of an electronic speed controller for commutation and customization for specific applications makes BDC...
This paper presents a brushless DC motor (BLDCM) control system that does not require Hall sensor and speed encoder for an air conditioner fan motor. Using low cost circuits, the zero-crossing points are detected to estimate the commutated timing and speed information. Hall element shortcoming can therefore be eliminated. A modified six-step square wave pattern with pulse-width modulation is developed...
This paper presents the development of control and power electronics parts for a BLDC motor drive. The signals from the most commonly used sensors for this application are used. The first one is the incremental encoder for speed and relative position detection, the other one is the three-signal Hall sensor which provides information about the absolute rotor position needed for electronic commutation...
This thesis shows the control process of in-wheel PMSM for electricity scooter. This motor has a mechanical complex structure, so it is difficult to install resolver or encoder position sensor. It suggested the way of vector control for PMSM motor with hall sensor. After driving with BLDC control way in low speed, the control method of motor convert into the way of vector control with MRAS speed observer...
Although magnetic bearing motors suffer no friction loss and hence require no lubrication, they are not widely used because of their high cost and large size. To solve these problems, a self-bearing motor having a simple structure with distributed windings is proposed. The rotor consists of a permanent magnet and an iron yoke that rotates in the body. The stator consists of a six-phase distributed...
This paper presents a brushless DC motor sensorless driver with sine pulse width modulation signal. For speed control, the current feedback is included to the closed loop control strategy to decrease the power consumption and increase the motor performance. In addition, the sine wave phase-changing signal is closed with a set of specific electrical angles in the zero crossing point to detect the back...
BLDC motors have been gaining attention from various industrial and household appliance manufacturers, because of its high efficiency, high power density and low maintenance cost. After many research and developments in the fields of magnetic materials and power electronics, their applications to electric drives have increased to a significant extent. In this paper, the modeling of Brushless DC motor...
In this paper, an accurate method for sensorless control of permanent magnet brushless motors is explained. The method doesn't include any modification to the classical construction of such motors and can be easily integrated within the drive electronics. It is applicable to both motor types, i.e. those with sinusoidal or trapezoidal back EMF.. The back EMF waveform is extracted on-line using simple...
This paper deals with an extension of Park's transformation to model permanent magnet (PM) non- sinusoidal machines by means of the so-called pseudo-dq axes reference frame. Speed and torque vector control can then be implemented resulting in a motor drive performance close to that of sinusoidal PM machines drives. Similarly, the proposed control algorithm is derived by decomposing the machine current...
The paper is focused on a sensorless controller design for a brushless DC motor. By utilizing the saturation effect of stator iron core, a low-frequency and low-voltage injection scheme is employed to estimate the initial rotor position. This scheme requires neither any current and position sensors nor faster sampling frequency and shorter time needed to complete processing and estimating such that...
This paper presents particular methods for deployment of the sensorless permanent magnet brushless DC (PM BLDC) motor drive system. The waveform of the motor internal voltages (or back emf) contains fundamental and higher order frequency harmonics. Therefore the third harmonic component is extracted from the stator phase voltage. The resulting third harmonic signal maintains a constant phase relationship...
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