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According to the basic characteristic of rotor bar breaking fault in induction motors and the physical concept of Hilbert transform of sinusoidal signal, this paper gives the definition of Hilbert modulus of filtered stator current signal of induction motors and presents its algorithm by blending Hilbert transform, spectrum analysis/correction and self-adaptive filter techniques perfectly. And then,...
In the railway system, in order to realize that locomotives can run stably. According to characteristics of traction and brake of locomotives, constant-speed controller on the base of double-hysteresis regulation is designed in this paper. Via smooth transition among traction, constant-speed and brake control, fluctuations of torque, flux and current are avoided during switches between different control...
The linear machine can achieve linear motion without rotary-to-linear converters, but the low force density has severely limited its applications in high-performance servo systems. Referring to high torque/force density machines, the transverse flux machine (TFM) is an ideal alternative, but the conventional structure of it is very complicated. In this paper, based on the operating principle analysis...
The transient and steady state operations of a closed loop variable speed 6-pulse PWM inverter-fed permanent magnet synchronous motor [PMSM] drive system are simulated. Performance of the system covering important operational aspects while using a hysteresis controller or a modified predictive current controller were evaluated over a wide range of speed. Comparison of the results provide insight into...
The use of fault tolerant drives is a way to achieve reliability and high system availability in airplanes. To isolate electrical fault it has been proposed to use concentrated coils around stator teeth with spacer teeth in between the coils. The space harmonic content of the air gap flux density in this type of machine is high. During normal operation certain harmonics are cancelled. This paper investigates...
The evaporative coolant hasn't the trait of making hollow conductor blocked in the evaporative cooling system of the hydrogenerator. If the processing quality is not ensured, the hollow conductor will be partly blocked thus it is important to calculate the temperature distribution of the stator bar on flow blocked. In our works, the finite difference method was adopted and some conclusions were followed.
Evaporative cooling for generator stator is an independent innovative technology developed by China. The development of the technology is in research stage. The mechanism of applying phase transition for evaporative cooling of the generator stator was introduced. according to the 300 MW turbo-generator design specification, and based on the two phase fluxion of cooling medium in the hollow conductor,...
With rapid development of the power semiconductor devices, direct-drive permanent magnet synchronous generator (PMSG) has shown the significant advantages for its high efficiency, reliability, and becomes an attractive choice for variable-speed wind power generation. MW class PMSG system with larger capacity, higher power density is an important trend. This paper describes the engineering design of...
The air friction loss on the rotor surface for a high speed machine can take a large part of the total losses and it is difficult to be determined theoretically or experimentally. In this paper, a calculation method of air friction loss for high speed machines based on fluid field analysis is introduced. The influences of rotor speed and air gap structure on the air friction loss are discussed. The...
The paper presents a simplified determination of the eddy current losses in the permanent magnets (PM) in PM rotating motors, caused by the slotting. The main assumption is that the eddy currents are resistance limited (weak diffusion effect). The procedure is as follows: at first, a rectangular geometry corresponding to the given rotating one is introduced; the PM field is determined in the slotless...
A method of sensorless vector control with unity power factor for surface mounted permanent magnet synchronous motor (SPMSM) is presented. The method can realize the motor control of unity power factor under the rated speed, and the motor can also work normally under high speed by way of field weakening. Comparing with the vector control of the statorpsilas magnetic force plumbs with the permanent...
This paper considers speed and position estimation of salient permanent magnet synchronous machines (PMSM) base on extended Kalman Filter (EKF), presents the modeling and analysis validation of a robust sensorless control method. The paper shows using an EKF instead of sensors of the mechanical quantities and aims the application in the field-oriented control (FOC) structure of the high-dynamic drive...
In this paper, the reason for the instability of the full-order flux observer in high speed region is analyzed. The feedback gain matrix is designed to stabilize the discrete system. Simulation results in Saber are presented to validate the efficiency of the proposed method.
The general methods to design induction motor torque and speed controller are analyzed based on passivity-based control (PBC) methods. In order to accelerate the response of system, a constant damping is injected into passivity-based controller, which will lead to the speed fluctuation in the period of arriving stable state currently. To overcome the disadvantage a new control strategy is presented...
A new harmonic analysis method - the amplitude recovery method - is addressed and is used in the in-site faults diagnostic in induction motors. To practice this method, an in-site and portable system of faults diagnostic in induction motors on ARM (advanced RISC machines) is also addressed. S3C2410 ARM is chosen as the core of this system. Its faster and multi-channel ADC subsystem and small size...
In order to make Three Gorgespsila evaporative cooling hydrogenerators have the best thermal performance, optimal design for the evaporative cooling system of stator bar has been made, and the thermal characteristic of the stator was analyzed by 3D FEM coupled analysis tool in this paper. The results provide the design basis for the industrial unit and show the evaporative cooling generator has lower...
The motor is the workhorse of industry. The control and identification of induction motor with artificial intelligence is the key point for high performance electrical drives. A novel architecture of nonlinear autoregressive moving average (NARMA) model based on wavelet neural networks (WNN) is presented for enhancing the performance of induction motor. The Akaikepsilas final predication error (AFPE)...
The paper introduces a sensorless control method which is called high frequency (HF) injection for salient-pole permanent magnet synchronous motor (PMSM). High frequency signal injection means to inject three phase symmetric constant amplitude voltage into the stator of PMSM. If the rotor has saliency, the current magnetic field of HF voltage signal must be influenced by the modulating function of...
This paper deals with investigation on iron loss analysis of line-start permanent synchronous motor (PMSM), which is applied in some industrial field and its load condition and voltage changes frequently. Time-stepping finite element method (T-S FEM) is employed to calculate the loss density in iron-core of PMSM with considering the harmonics of the flux density, and the total iron loss can be obtained...
This paper presents the design and analysis of a new double-stator permanent brushless (DSPMBL) motor for hybrid electric vehicles. The corresponding output power equation is analytically derived. The initial calculation of motor dimensions and parameters, including the core diameter, stack length, permanent magnet size and winding connection modes, are also discussed. A DSPMBL motor is designed....
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