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This paper proposes a novel scheme of reducing the commutation torque ripple of BLDC motors by injecting additional voltage in the non-commutating phase of the motor. The SIDO converter used in this work provides two independent output voltages with different magnitudes. One of the voltages (V1) is connected to Voltage Source Inverter (VSI) which runs BLDC motor. Another voltage (V2) provides an additional...
This paper considers vehicle speed dependent assistant control problems for electric power steering systems (EPSs). According to the requirement analysis of the vehicle speed dependent assistant control, a mathematical model of EPSs is established, and a double closed-loop control system structure is proposed. Based on the assist characteristic of the desired steering wheel torque, the function model...
With the advantages of small size, light weight and more compact construction, brushless DC motor (BLDCM) has been widely applied to the field of industry. Centrifugal compressor converts the kinetic energy of the air into pressure, and it can be used to provide air to the full cell. The drive and control strategy of BLDCM not only affect the characteristics of centrifugal compressor, but also has...
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...
Progresses obtained in command and power electronics have increased the technical and economic performances of brushless direct current motors. Consequently, the problem of optimum design and operation of these motors, frequently used for driving small vehicles, is a very present one. Studies presented in literature show that high oscillations of torque occur in these motors in a complete rotation...
This paper presents a new type of electrically driven mining vehicle which adapts to the characteristics of seabed complex terrain environment. The optimal drive motor is selected and the corresponding control algorithm is designed. The obstacle surmounting process and the change law of the output torque of the electric driven mining vehicle under typical working conditions are analyzed. The simulation...
In view of the saturation of the traditional PI controller, a novel anti-windup controller with integral state prediction function is proposed in the direct torque control system of Brushless DC motor. Based on the analysis of the influence of the traditional speed controller model and the initial value of the integral link on the system, an integral state predictor is set up on the basis of the conventional...
The paper presents an analysis of influence of selected fault states on properties of brushless DC motor with permanent magnets. The subject of study was BLDC motor designed by the authors for unmanned aerial vehicle hybrid drive. Four parallel branches per each phase were provided in the discussed 3-phase motor. After open-winding fault in single or few parallel branches, a further operation of the...
This paper proposes a method for direct torque control of Brushless DC (BLDC) motors. Evaluating the trapezium of back-EMF is needed, and is done via a sliding mode observer employing just one measurement of stator current. The effect of the proposed estimation algorithm is reducing the impact of switching noise and consequently eliminating the required filter. Furthermore, to overcome the uncertainties...
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...
This paper presents a design and control scheme of a high speed BLDC(Brushless DC) motor for a blender machine. In order to improve the operating efficiency, a conventional universal motor is replaced by the BLDC motor and a proper power control scheme for the blender machine is proposed. For the high speed operating, a 2-pole structure is selected, then, the stator slot number and turn numbers of...
The Halbach array is applied in the skewed brushless DC motor for improving electromagnetic torque. The paper analytical calculate the open circuit field and the armature field in the motor with Halbach arrays. There are two types in the Halbach arrays, one is each pole with two segments of magnet(1P2s) and another is each pole with three segments of magnet(1P3s). The electromagnetic torque is calculated...
Speed-torque characteristics of brushless DC motor with ideal trapezoidal back electromotive force (EMF) is obtained under the analysis of the commutation and conduction region with two switches conducted and six states driven mode. The back EMF coefficient is calculated from the average value of back EMF during conduction area to speed. And torque coefficient is calculated from the ratio of average...
Brushless DC (BLDC) motors have been widely used in industry. However, one of the main drawbacks of using BLDC motors is the undesirable torque ripple. The torque ripple can cause mechanical vibration, acoustic noise and bearing damage that reduces the lifetime of the machine. This paper proposes a simple repetitive control scheme to attenuate torque ripple of BLDC motors. In this method, the ripple...
Lower limb exoskeletons have already proven the capability to give back mobility to people suffering from spinal cord injury (SCI). Other important populations such as people with multiple sclerosis or muscular dystrophy, frail elderly and stroke victims, suffer from severe gait impairments and could benefit from similar technology. The work presented in the current paper describes a novel design...
Brushless DC motor has been becoming more popular in industry, electric and aerospace applications, making the control for four-quadrant operation of Brushless DC motor greatly significant. This paper presents pulse width modulation (PWM) control mode for four-quadrant operation of Brushless DC motor, which can realize both motoring and braking operation at the same rotation direction. Based on the...
A parameterized design of speed servo controller for brushless DC motors is presented based on a robust composite nonlinear control framework. The servo controller consists of a linear control part for achieving fast response, a nonlinear feedback part for suppressing the overshoot, and a disturbance compensation mechanism for erasing the steady-state error. A reduced-order extended state observer...
Although three million people around the world suffer from the lack of one or both upper limbs 80% of this number is located within developing countries. While prosthetic prices soar with technology 3D printing and low cost electronics present a sensible solution for those that cannot afford expensive prosthetics. The electronic and control design of a low-cost prosthetic hand, the Touch Hand II,...
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...
The method of functions of line by line flux for estimating rotor position in sensorless BLDC drive is presented in this paper. This method has appropriate eificiency over a wide range of speed and it estimates the rotor position independent from speed and rotor frequency. Two techniques of DTC and SWF are used to design the sensorless BLDC motor drive. Finally, simulation results show that the DTC...
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