the efficiency of induction motors decreases at light loads. efficiency optimizer control systemsadjust the motor flux value to achieve the best efficiency in a wide range of load variations. reduced fluxoperation has some other benefits such as power factor improvement and torque ripple reduction. the latter isan important issue in a direct torque controlled induction motor drive. in this pape...

Nowadays the use of the Switched Reluctance Motors (SRMs) has been considerably increased in various home and industrial applications. Despite of many advantages of this type of motors, such as simple structure, low cost, and high reliability, the main disadvantage of them is the generation of high torque pulsation. This paper presents a novel method to optimize a typical SRM such that the torq...

This paper presents a new procedure for the speed changing of the twospeed compressor driven by the singlephase Permanent Split Capacitor (PSC) motor. The use of the two-speed motor for compressor is one of the effective ways for their capacity control. But the two speed compressors now in use are driven by three-phase motors. It is because a single-phase, two-speed motor has rather a small sta...

Recently several robust control designs have been proposed to the LoadFrequency Control (LFC) problem. However, the importance and difficulties in the selection of weighting functions of these approaches and the pole-zero cancellation phenomenon associated with it produces closed loop poles. Also the order of robust controllers is as high as the plant. This gives rise to complex structure of su...

In this paper, a new six-phase pole-changing induction motor drive is proposed to extend the constant-power operating range for electric vehicle application. The double Fourier series is newly employed to analyze the spectra of the motor phase voltage and current. Consequently, the harmonic expression of the inverter dc-link current can be derived. In order to reduce the dc-link harmonics, a ne...

When an induction motor is running at stable speed and low slip, the fault signal of motor’s broken bar faults are easily submerged by power frequency (50 Hz) signal. Thus, it difficult to extract characteristics. The left-side harmonic component representing characteristics can be distinguished from owing V-shaped trajectory in time-frequency (t-f) domain during startup. This article proposed ...

In this paper, an oil-cooling induction switched reluctance machine (ISRM) is offered. The stator and rotor of the electric are non-segmental. However, by placing coils on rotor, a short magnetic flux path achieved in cores. As result, higher torque with lower losses generated. This configuration can be used high-power motors for hybrid vehicles. ISRM novel there lack access to its operation da...

Problem of calculation distribution magnetic field induction in clearance tubular linear motor (TLIM) is considered. Mathematical model represented by Fredholm integral equations second kind for complexes electric strength and density coupled magnetization currents at interface environments. Algorithm TLIM has been developed. Dependence on value pole division investigated. There area optimum pi...

The paper deals with faults diagnosis method proposed to detect the inter-turn and turn earth short circuit in stator winding of three-phase high-speed solid rotor induction motors. This based on negative sequence current motor fuzzy neural network algorithm. On basis analysis 2-D electromagnet field impedance has been derived develop equivalent circuit. is simulated by MATLAB software study re...