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The modification of the torque-speed characteristic can be achieved by changing the connection between the coils from star to delta. During the reconfiguration process, depending on the strategy used, a torque interruption or jolts can occur. In this paper, we propose a novel strategy that suppresses these torque variations. The proposed approach is based on a fine control of the phase currents through...
This paper presents the advances in the construction of a test platform whose main objective is to develop and validate control strategies on a traction wheel motor for electric bicycles (EB). It serves as a tool to evaluate strategies of torque and speed control, regenerative braking, pedaling assistance, among others. In the future, it is expected to obtain a controller to achieve a higher dynamic...
In this study, a diagnostic method to identify the misplacement angle of a Hall-effect position sensor in brushless DC motor drives is presented. The proposed method is based on a single signal measurement, deployed on a Fuzzy Inference System (FIS), and can be implemented on a micro-processor for near real-time diagnosis of the unbalanced positioning of a sensor. The designed FIS was evaluated in...
In this study, a diagnostic method to identify potential faults of Hall-effect sensors in brushless DC (BLDC) motor drives is proposed. The wavelet signal theory is evaluated as an alternative diagnostic method, able to identify either a breakdown or a misplacement of a position sensor. The proposed method combines the required noise insensitivity with the measurement of a single signal. Since the...
Brushless DC (BLDC) motors have been applied extensively in household and industrial scale because of the advantages such as high efficiency and low mechanical losses because it does not use a brush such as DC motors. Application of the BLDC motors use rectified AC source to minimize battery usage. However, the use of BLDC motors and rectifying circuit causing poor power factor and facing harmonic...
In this paper the phase back EMF Zero Difference Point (ZDP) detection based sensorless control has been applied with the estimated back EMF using unknown input observer. The performance of VSI fed BLDC has been studied with various load torque and input speed reference. The phase to phase back EMFs estimated by the unknown input observer is used in place of Phase back EMF differences to get Zero...
Direct torque control method for BLDC motor drives usually represents reduction in high ripples in the torque. The important characteristics observed in DTC is non-linear regulation of stator flux and torque within variables structure by hysteresis band controller. For particular sampling period Ts values of torque and flux are chosen for Hysteresis band. This would help to achieve average sampling...
In this paper, by analyzing the relationship between rotor position and phase back electromotive forces (PB-EMFs) of brushless DC motor (BLDCM), a novel rotor position detection method based on morphological filter algorithm (MFA) for BLDCM is proposed. MFA is applied to identify the signal turning points (STPs) of the input stator PB-EMFs, which provides technical support for the current commutations...
For rotating machineries, unbalance of the rotor is widely existed which plays a bad role resulting in unexpected vibrations, uncertain dynamics and even unstable motions. The GyroWheel system, a typical rotating machine, is an innovative attitude determination and control device, which provides a varying amplitude and direction of the angular moment vector by using a spinning flex-gimbal suspension...
In this paper, the control strategy of this kind of motor is expounded in detail for the out rotor bearingless brushless DC motor applied in flywheel energy storage. Flywheel energy storage has two kinds of way of working as an energy storage device. When working in the charging state, the motor as the motor used; when working in the discharge state when the motor as a generator to use. The control...
In this paper, we propose a new type of brushless excitation mechanism. Powering the motor exciting winding by wireless power transmission (WPT) based on magnetically-coupled resonance can be an efficient way to avoid mechanical connection of the rotor and the external terminal, and achieve brushless excitation conveniently and economically in a novel method. The constituent parts of this excitation...
This paper presents the design and development of a 120W 3Ph Switched Reluctance Motor and associated Controller. The motor as well as controller design procedures are discussed. The motor is designed using the conventional analytical methods and the design is verified and fine tuned using FEMM software. The motor prototype has been fabricated and assembled. The Controller prototype consisting of...
Conventional single phase permanent magnet (PM) brushless DC motors (BLDC) are used in low power consumption applications, which require relatively small torque, such as fans and pumps [1].
This paper provides an overview of the progress in sensorless permanent magnet synchronous machine (PMSM) control techniques in Japan. In the first stage, the techniques extracted rotor position information by back-EMF zero-crossing detection techniques. Since around 2000, model-based position-sensorless control techniques have been evolved and are widely used in home appliances as well as general...
Brushless DC motors (BLDC) can achieve a high performance on efficiency comparing to traditional Brushed DC motor, but their control is more complicated because it requires a phase supply switching circuit. This paper presents a trapezoidal control of an Outrunner Brushless motor based on Hall effect sensors and a DSP card to implement the all control scheme. An algorithm to calculate the rotor speed...
The main purpose of this research paper is to describe a mathematical simulation modelling of Brushless DC (BLDC) motor drive with the help of MATLAB - SIMULINK environment. The application of these motor is to spread widely in various fields like aerospace, robotics, industrial process control, precision machine tool, automotive electronics and household application. In this paper, the mathematical...
In this paper, speed control, torque ripple minimization and Power Factor Correction (PFC) of a Canonical Switching Cell (CSC) Converter fed sensorless Permanent Magnet Brushless DC (PMBLDC) motor drive system with varying load is discussed. The constant speed of operation with minimum torque ripples and unity power factor operation during transient state is the most difficult control part in the...
This paper presents the simulation for sensorless operation of BLDC motor drive with speed control, designed for Air conditioners. As the motor starts to rotate back EMF is obtained from the motor terminals using a voltage divider along with a low pass filter. Control pulses for inverter are generated based on the zero crossing of back EMF. The results have been validated in Matlab Simulink platform.
In brushless dc motor (BLDCM) precise commutation point and commutation interval, which impact motor torque ripple and motor efficiency are significant issue. Especially for high-speed high-power BLDCM drive without rotor position sensors (i.e. sensorless drive), the impact of commutation electrical angle error becomes more important. However commutation error is inevitable due to interference, detection...
In this paper, a pure torque loop control method without flux linkage observer and a modified double closed loop control method with a couple of derived simple equations for the control of the stator flux linkage amplitude were proposed for direct torque control (DTC) of brushless DC motor (BLDCM), using a 2-phase conduction mode. The objectives of the novel control strategies are trying to simplify...
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