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For sensorless control of switched reluctance motor, it is significant to improve the accuracy of the angle estimation. In traditional current-gradient method, it is thought that the null current gradient point appears just at the pole overlap position without considering the magnetic saturation, which is exploited as the reference position in the cycle. However, the actual null current gradient position...
Torque ripple presents the main disadvantage of switched reluctance motor. Advanced control methods allow to minimize the torque ripple, which requires knowing the motor parameters — inductance and torque characteristics. The paper presents parameter identification of switched reluctance motor with 2p1/2p2 = 12/8 number of poles. Included in this document are results of inductance and torque measurements...
A full cycle pulse current peak envelope sensorless technique is presented in the paper, using the pulse injected and the chopper control mode with fixed chopping falling time for the rotor position detected. The high frequency pulse injected in the non conducting region, the chopper control mode in the conducting region, the discrete peak values of the pulse current are detected, the full cycle pulse...
In order to improve the fault tolerance performance of switched reluctance motor (SRM), this paper designs a double redundancy switched reluctance motor, each phase of the motor is consisted of two winding and each winding can be controlled separately. Through different winding connection mode, other winding could still work when part winding break down, thus effectively improving the motor's fault...
The switched reluctance motor (SRM) is suitable for high-speed driving and enables high output. However, it is less efficient than other motors. This is due to an increase in iron loss caused by high speed operation. Therefore, in this paper, we adjusted firing angle and verified that firing angle realizing maximum efficiency exists by changing current waveform and loss. It was confirmed that the...
In this paper, six phase 12/10 pole toroidal winding switched reluctance motor (TSRM) is presented. TSRMs has short coil-end, and generates torque based on mutual inductance. This paper compares a concentrated winding SRM and different winding scheme TSRMs. The torque of one of the TSRMs is increased by 14% comparing to the concentrated winding SRM.
This paper presents the analytical Modeling of Switched Reluctance Motor(SRM) based on the data obtained from Finite Element Analysis(FEA) tool Ansys Maxwell. Once the design of the machine is done in FEA tool then before manufacturing the actual machine it is necessary to test its dynamic performance. Testing of dynamic performance involves the operation of the motor with different control strategy...
The phase inductance of Switched Reluctance Motor (SRM) is a function of position and stator current. To predict the performance of the motor an accurate model is required. This paper deals with modeling and analysis of Switched Reluctance Motor with Three Term Inductance model. In Three-Term Inductance method, the motor is modeled by estimating the inductance at three different positions of the rotor...
The basic work principle and mathematical model based on the research of the switched reluctance motor, using finite element software to establish the simulation model of dual redundant switched reluctance motor. Through the analysis of the theory of switched reluctance motor, the motor's flux characteristic, inductance characteristics and torque characteristics are compared and study the influence...
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...
Single phase IMs have been widely used in home appliances such as fans, pumps and so on because they are directly driven by commercial AC power supply. However, the motor efficiency is very low because the rotor winding and auxiliary winding generate large copper loss. Therefore, in this research, a novel single phase switched reluctance motor (SRM) which is directly driven by commercial AC power...
The electric drive system is one of the most important parts of electric vehicles (EVs), whose function is the conversion between electric energy and mechanical energy. Switched reluctance motor (SRM) has the features of simple construction, high starting torque, wide speed range, high efficiency and high reliability which are appropriate for EVs drive system. Firstly, instantaneous torque control...
A 12/14 bearingless switched reluctance motor (BLSRM) with hybrid stator poles has been proposed due to the outstanding decoupling characteristics between the torque and suspending force. However, the motor is a two-phase motor. The output torque of the motor has torque dead zone and high torque ripple. Hence, the motor cannot self-start at some rotor positions. To solve the self-starting problems...
The Switched Reluctance Machine (SRM) is known for being one of the oldest electric machine designs. Unfortunately, it is usually assumed that this implies that the machine is outdated. However with the advent of microprocessors, the SRM has become a suitable option for a number of applications because the shortcomings of the machine can be mitigated with control. Compared to other machines, the SRM...
In this paper, a novel current tracking strategy for switched reluctance motor (SRM) is proposed, analyzed and verified. The relationship between pulse-width modulation (PWM) duty ratio and current variation in SRM over a cycle is investigated. The results demonstrate that an analytical resolution for calculating the duty ratio to achieve accurate current tracking is not possible because of the nonlinear...
Switched reluctance (SR) motors have many advantages such as simple and solid construction, low-cost on manufacturing, excellent reliability at high temperatures, and large torque density. However, the higher torque ripple from magnetic saliency is a serious problem preventing its applications from being expanded. Several torque control methods have been already proposed. In practical use, a controller...
A novel method to model electrical machines based on winding function theory (WFM) is proposed. In conventional WFM, it is assumed that flux lines in air gap are in radial direction. The main drawback of this assumption is inaccuracy of the simulation results. To improve the accuracy of the WFM, modified winding function theory (MWFM) is proposed. In this method WFM is improved by finite element method...
Existing position sensorless methods rely on: 1) one-to-one correspondence between magnetic characteristics of switched reluctance motor (SRM) and rotor position; and 2) access to terminal quantities (i.e., voltage and current) for all phases. The occurrence of a fault in one or more phases will prohibit the necessary access to the phase/s and as such introduces a challenge to successful implementation...
A switched reluctance (SR) motor has a doubly salient pole structure. A stator has concentrated windings on each pole, while a rotor is only made of iron core. Therefore, the SR motor is expected as a low cost, extremely robust, variable speed motor. The performance of the SR motor greatly depends on magnetic properties of core material since it consists of only laminated-core and windings. However,...
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