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The large torque ripple of a switched reluctance machine (SRM) caused by commutation and the inherent nonlinear torque-producing nature is a major disadvantage for its widespread application. To mitigate this problem, current profiling for torque ripple minimization has been extensively pursued, however, most current profiling attempts are performed on existing SRM designs and thus will not guarantee...
The torque ripple control of Permanent Magnet brushless AC (PMBLAC) motor using fuzzy logic technique is proposed. Due to small inductance, a severe torque ripple is induced by the modulation of a three phase inverter. In the buck boost converter, the dc link suppresses the ripple produced by the three phase inverter by using Pulse Width Modulation (PWM) control. The torque control is done by improving...
The technique for direct torque control (DTC) without position sensor is proposed in this paper. In DTC system, the rotor position information is important factor to calculate torque and know commutation point. Basic sensorless DTC system includes Look-Up Table (LUT) to get the information of rotor position or torque value. Instead of the LUT, the rotor position information can be substituted to interval...
This study proposed a fuzzy excitation controller to reduce noise and torque ripples for switched reluctance motors. The design of the controller is simple and can generate appropriate turn-on and turn-off angles according to the speed of torque error in order to improve the torque response. At the motor speed of 300 rpm with one Nm load, the experimental results showed that the implantation of a...
For switched reluctance machines, a major problem is the torque ripple, which causes increased and undesirable acoustic noise and possible irregular speed. This paper aims at determining optimal turn-on and turn-off angles for torque ripple reduction of a three-phase 6/8 switched reluctance motor/generator. A commutation-angle optimization technique is therefore implemented for both motoring and generating...
Brushless DC (BLDC) Motor is widely used in home appliance, robot, and vehicle industry due to the merits of high power density, low noise, and simple controllability. A demands for the motor, especially slim-type BLDC motor, is expected to increase continuously since the minimizing trend of the actuators is getting attention from various applications. Because a phase inductance of the slim-type BLDC...
The torque ripple reduction control of the switched reluctance motor (SRM) is generally implemented by current control, turn-on and turn-off control based on the inductance profile. Turn-off angle control, as a complex relation between motor speed and current, is required for a wide range of operating speeds. However, these methods show limited performance. This paper presents a fuzzy logic turn-off...
Back EMF zero crossing detection method has been successfully applied to sensorless control of conventional brushless DC motor. This paper highlights the differences in its implementation for novel transverse flux permanent magnet motor (TFPMM), as regards additional detection error. The reasons for long commutation process in novel TFPMM have been discussed to indicate much wider voltage spikes,...
The high speed drives are much interested in the industrial applications due to the compact size and high efficiency. This paper presents a torque control scheme using modified TSF(Torque Sharing Function) for the high speed SRM(Switched Reluctance Motor). Because of the short commutating duration in the high speed region, the negative torque from the tail current makes the high torque ripple. In...
This paper offers a new converter for switched reluctance motor (SRM) drive which uses one switch in each phase. One switch for each phase is the least number of switches among the converters used in the switch reluctance motor drive. Also, the proposed converter enjoy from an important characteristic which makes it suitable for high speed drive applications. This is due to the fast phase current...
A novel 3-Level converter configuration for switched reluctance motor is proposed. Using the 3-Level converter, switched reluctance drive has a fast magnetisation and fast demagnetisation to improve dynamic performance and efficiency. Also the proposed converter is suitable for high speed drive application, due to the fast magnetisation and the fast phase current commutation (fast demagnetisation)...
This paper presents an analytical method for calculating the direct- and quadrature-axis inductances of the universal AC commutator motor, suitable for use in design calculations. These inductances are important in understanding the steady-state and transient behaviour, and the commutation. The analysis concentrates on the parameters affecting these inductances, and draws attention to the rarely-mentioned...
By studying the circuit equation in the process of commutations of brushless DC motor (BLDCM), the reason of phase current ripple is pointed out. The effect of phase current ripple to electromagnetic torque is analyzed. The deficiency of conventional current closed-loop control is studied. On the base of analysis a new current closed-loop control method is proposed. Phase current is inputted to PI...
The doubly salient electro-magnetic motor (DSEM) is subject to significant torque ripple when working with traditional standard angle control method. To weaken the effects of the torque ripple for further applications of DSEM such as wind power generation and aerospace, in-depth analysis of the ripple generation mechanism and two novel strategies of inner torque loop and torque distribution control...
The paper presents a complete mathematical analysis of a BLDC motor commutation which results in the motor static characteristics torque-speed and efficiency-speed. The motor, having a sinusoidal back emf, is supplied from a DC source via a 6-leg inverter using the 120degON operation. The formulas for the phase currents and voltages are derived. The first harmonic of the phase voltage is determined,...
A new approach to automatic control of excitation parameters for the switched reluctance motor (SRM) is presented. A turn-on and turn-off angles play important roles in developing electromagnetic torque in SRM. The value of excitation angles are usually variable and depend upon the motor speed and other parameters of the inverter that excites the SRM. As the motor speed increases the shape of the...
When BLDC drive mode is used to drive PM-AC motors, the influence of the transient current cannot be neglected, especially during high speed operation. In this paper, this influence to the BLDC drive mode is analyzed, and an analytic model for describing the transient current to the commutation angle and copper loss is presented. A method to determine the optimal commutation angle of the BLDC mode...
Torque ripple and consequent acoustic noise is one of the primary disadvantages of a Switched Reluctance Machine. In this paper a Novel torque ripple minimization technique for switched reluctance motors (SRM) drive is presented. In this method the inductance and its rate of change with rotor position for each motor phase that participate in positive torque production is obtained through simulation...
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