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The modal analysis plays an important role in analyzing the vibration and noise of the motors. The models of the stator which are based on the interior permanent magnet synchronous motors (IPMSM) by the 3D finite element software are analyzed. Firstly, it is significant to simplify the stator rind by considering the different components. Then the relationships of the different parameters of the stator...
This paper investigates a novel hybrid axial- and radial-magnetic circuit permanent magnet synchronous machine with flux weakening capability. The presented machine consists of a solid rotor and two stators, i.e. radial stator and axial stator. The PMs are radially buried in the solid rotor so that the flux flows into both radial and axial stator. This paper describes the principle of the presented...
This paper introduces a new topology of multi-stator hybrid excitation permanent magnet synchronous motor with flux weakening capacity. The presented machine features a hybrid magnetic circuit in which the flux generated by PMs are routed into two paths by employing an axial stator. The detailed structure of the presented machine is given in this paper together with the principle of flux weakening...
Line-start permanent magnet synchronous motor with composite rotor is a new type of permanent magnet synchronous motor, which uses eddy currents induced in solid rotor and copper bars to achieve self- starting capability. In order to research the demagnetization of permanent magnets under three-phase short circuit and out-of-step fault, the finite element model considering saturation, eddy currents...
The critical speed of the rotor can be calculated accurately by the transfer matrix method and the finite element method. Since the mass of the shaft section is neglected by the transfer matrix method, the calculation result is slightly larger. By establishing the 3D finite element model of the rotor system, the critical speed and mode of the rotor are analyzed. The results show that the bearing support...
Linear flux switching motor with segmented secondary (LFSMSS) is characterized by two kinds of windings, i.e. the DC field windings and AC armature windings, which are distributed alternately on the mover. LFSMSS is vulnerable to large force ripple. This paper investigates the influence of two design techniques (dummy slot and auxiliary tooth) on the force ripple of LFSMSS. In addition, the simulation...
This paper presents a novel 6/8 pole changing line-start permanent magnet synchronous motor (LSPMSM) which can decrease braking torque and pulsating torque fundamentally and improve starting capability effectively. The impedance parameters of 6-pole winding and 8-pole winding are calculated in use of two-dimensional (2D) finite element analysis (FEA). Then the bipolar dynamic simulation model is built...
To investigate the influence of sectionalized stators on shaft voltage in integer slot permanent magnetic synchronous machine (PMSM), an aid of magnet circuit and analytical method is proposed to deduce the shaft voltage, whilst segment and pole number combinations are further discussed. Finite element method (FEM) is used to verify the accuracy of above qualitative analysis. The influence of various...
For high speed permanent magnet machine, it is necessary to meet the requirements including electromagnetic properties, mechanical properties and temperature, so it is a multi-physics field iterative design process. Based on the electromagnetic field, the temperature field, the stress field and the rotor dynamics, a 360kW, 7000r/min high speed permanent magnet machine is analyzed. Through the multi-physics...
Modal analysis is an important step which studies the vibration characteristics of the motors. The passage analyzes the models of the stator by the 3D finite element software called Workbench, which are based on the interior permanent magnet (IPM) synchronous motor which has 6 pole- pairs and 36 slots structure. Meanwhile, the influence of the yoke thickness, tooth depth, tooth width, the stator coils,...
The cogging torque in the interior permanent magnet synchronous machine(PMSM) leads to mechanical resonance, vibration, and noise, which would reduce the control accuracy of the machine. It is important to calculate the cogging torque of the interior PMSM. Up to now, there is no accurate calculation method of the cogging torque for the interior PMSM, and the accurate calculation relies on the Finite...
Exploiting the permanent magnet wind generator (PMWG) with high speed and high power density is one of the promising aspects in the field of the wind generator design. In this paper, the design principles of the high speed PMWG are proposed and the detailed design of a 360kW, 7000rpm PMWG used in a wind energy storage system is discussed. Based on the design scheme, the simulation has been conducted...
Line-start permanent magnet synchronous motor has many advantages, but it has two important defects are poor starting torque and synchronization capability. This paper presents a pole-changing of line-start permanent magnet synchronous motor which has a 6/8 pole-changing stator winding. A new structure of stator winding is designed to realize pole-changing. This motor can eliminate braking torque...
To ensure the starting performance of the single-phase induction motor with three parallel-connected windings, the transient performances and starting methods are studied in this paper. At first, the transient mathematical model of the motor is established according to the electromagnetic relations, and the simulation analysis is performed. Then two starting methods are proposed and studied. The first...
To ensure the transient performances of the singlephase induction motor with three parallel-connected windings, the simulated and experimental researches are carried out detailedly in this paper. At first, the transient simulation model of the motor is established and the simulation analysis is performed. Then the experiments are performed on the prototype motor, to verify the validity of the above...
When the line-start permanent magnet synchronous motor (LSPMSM) operates stably, sudden change of load torque may result in out-of-step and supersynchronous faults. The currents in stator windings and rotor bars will increase under the two faults, so will the strength of demagnetization field, which is likely to cause the irreversible demagnetization of permanent magnets in LSPMSM. This paper adopts...
Permanent magnet (PM) of the high speed permanent magnet machine has to be protected to resist the huge centrifugal force. One of the mature protective measure is to retain the PM with the nonmagnetic alloy sleeve. However, the rotor eddy-current losses would increase meantime. Decreasing the sleeve thickness would reduce the eddy-current losses of the machine but decrease the mechanical strength...
In order to study the effect of removing the filter capacitor in the rectifier circuit on the steady-state performances of the permanent magnet direct current motor, simulation analysis and experimental research were accomplished according to a rated voltage 300V DC, 180W, 2-poles permanent magnet direct current motor. The motor was fed by three different methods. The first method is to use standard...
Linear switch reluctance machine (LSRM) has been a promising alternative for linear application systems despite its low force density and high force ripples. In long stroke conveyor applications, the stator of LSRM should be laminated requiring no gap or interruptions, being a difficulty in practical use. This paper presents a dual stator LSRM with magnetically isolated rectangular segments. The presented...
This paper discussed an improved structure of a hybrid excitation brushless claw-pole alternator (HEBCA). The alternator flux regulation and operation performance is simulated based on 3-D FEM. Finally, a series of experimental tests carried out on a prototype are made to verify flexible control of the flux as well as machine power production capability.
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