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Design of switched reluctance motor (SRM) with emphases on torque ripple suppression and current reduction is researched in this paper. The motor is operated with direct torque control (DTC) to obtain a good torque control performance. Since motor design and motor control are two important aspects of the motor drive system, to achieve a better performance of the whole system, they should not be treated...
In DC-biased sinusoidal current vernier reluctance machines (DC-biased-VRMs), the DC exciting winding and AC armature winding are integrated into one single winding. Therefore, the copper loss can be reduced with torque density increasing, and only one set of power electronic converter is demanded. This paper is to propose a DC-biased-VRMs drive with asymmetrical power electronics devices and corresponding...
Servo motors are widely used in many industrial applications. These motors require precise control of acceleration, speed, and position. Different designs can be found in the literature. This paper will compare the response of two of the common types and will propose a new servo motor design that uses a smaller amount of magnet, lowering the price of the motor. The proposed motor would be able to...
This paper proposes a novel three-part hybrid rotor design for a permanent magnet synchronous machine (PMSM). The hybrid rotor can be designed to achieve key desired parameters and obtain extended speed operation by combining simple PM and reluctance rotor designs. An additional degree of freedom in the proposed three-part hybrid rotor is the flexibility to align the magnetizing axis of the reluctance...
Interests in using rare-earth free motors such as switched reluctance motors (SRMs) for electric and hybrid electric vehicles (EV/HEVs) continue to gain popularity, owing to their low cost and robustness. Optimal design of a SRM, to meet specific characteristics for an application, should involve simultaneous optimization of the motor geometry and control in order to achieve the highest performance...
In the industrial field, the drive system integrated the high speed motor and the gear is required to effectively utilize the limited space. However, mechanical gears often require their lubrication and cooling, they generate whilst noise and vibration. To overcome these problems, the magnetic gears have been expected. Magnetic gears achieve the system with maintenance-free, low noise and low vibration...
This paper deals with the self-commissioning of synchronous reluctance motors. Previous work has demonstrated that the motor flux maps can be accurately identified at standstill by exciting the machine with square-wave voltage pulses of large amplitude, of the same order of the machine nominal voltage. This was made without the need of rotor locking and without using position sensors. The knowledge...
This paper proposes a new family of electric motors based on the concept of an airgap-less device with an internal rotor. The internal flux and therefore electromagnetic torque is maximized because the rotor is allowed to touch the stator. The proposed family of motors are competitive in applications where hydraulic motors are prevalent, i.e., low-speed and high-torque requirements. Furthermore, the...
This paper investigates the applicability of fractional-slot concentrated windings to Synchronous Reluctance Motors for industry applications. Tooth-wound winding arrangements are attractive for the industry due to their lower cost of manufacturing, but when associated to a synchronous reluctance rotor they tend to lower the output torque and power factor of the machine significantly, and to excite...
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...
This paper presents the design of an interior permanent magnet synchronous motor (IPMSM) with fractional-slot concentrated winding (FSCW). The study determines the number of poles and slots considering the winding factor and unbalanced magnetic force. Conventional calculation method is used to obtain the initial dimensions and finite element analysis (FEA) is adopted to acquire the performance of...
Electric motors play an important role in global efforts to reduce energy consumption as they account for almost half of the total electrical energy usage in the world. The energy consumption of electric motors can be reduced by using more efficient motors and by applying frequency converters to feed the motors, thereby enabling accurate control according to the load. The induction motor has been...
Formula SAE is an international engineering design competition for university students to design, build and test a four-wheel race car in one year. Formula student electric series has been introduced into formula student duo to the increasing interest in electric mobility. This paper presents the development of a permanent magnet synchronous motor for a formula student electric race car. A 10 poles/12...
This paper deals with the control strategy for synchronous homopolar machine adapted for traction applications. Advantages and disadvantages of homopolar motors are first discussed. Mathematical models and variations of its design are given. The structure of the proposed control strategy is based on field oriented control but it was modified in order to achieve maximum performance according to experimentally...
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...
This paper deals with the derivation of commutation angles for maximum torque for switched reluctance motors operated over their entire speed range. A linearised model of the motor was used for this purpose, and the definition of the rated speed was derived. It is shown that the switched reluctance motor provides constant power in the field-weakening mode in case of continuous current operation. Then,...
Based on analysis of sources of the noise of switched reluctance motor (SRM), the paper puts forward methods to reduce noise in terms of torque ripple and phase change from the point of control view. In the low speed stage, phase current closed-loop segmented according to the sine and cosine curve, maintain a constant torque to reduce the torque ripple. Put forward soft turn-off method at the time...
Switched reluctance motors (SRM) have many differences between traditional motors in performance analysis because of the special structure. First, the characteristics and structure parameters with large influence on the performance of SRM is discussed. Then a method for modeling and simulation of SRM system based on Maxwell and Simplorer is proposed. Finite element model of SRM with different structure...
This paper describes the choice and the design optimization of an industrial purpose permanent magnet brushless synchronous motor to be used in a small electric vehicle conversion. The suitable stator configuration for high torque density combined with reduced cogging torque and reduced torque ripple is analyzed. Finite element analysis is used to evaluate the performance of different electric motor...
In this paper a Model Predictive Control (MPC) was applied to the flux and torque control of a Synchronous Reluctance Motor, SynRM. The behavior of the controller was analyzed based on model's simulations performed in Matlab/Simulink Software. From the results, it was verified that the controller has good performance. The SynRM can reach the speed reference value controlling simultaneously flux and...
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