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The circuit breaker is an important part of control and protection in the power system. Mechanical failure is the main fault of circuit breakers, and the loosening of fasteners is one of the typical mechanical faults. The self-loosening of bolted joints is closely related to the vibration, especially transverse vibration. There is strong vibration while the circuit breakers are opened and closed....
Brushless doubly-fed generator (BDFG) has a good application prospect on the wind power generation field. In order to improve the power density, a new type of dual-stator brushless doubly-fed generator (BDFG) with magnetic-barrier rotor is presented in this paper. The overall structure design method and mechanical performance of DSBDFG is put forward and analyzed. In this paper, the stress analysis...
In order to reduce the low-order torque ripple of the permanent magnet synchronous motor, the method of suppressing pulsating torque by suppressing low harmonics of stator current is adopted. So, a harmonic suppression model based on harmonic injection method is established to suppressing low harmonics. But, the large amount of calculation, making the result of calculation is difficult to follow the...
Due to high-speed rotation, the problems about rotor mechanics and dynamics for outer rotor high-speed machine are more serious than conventional ones, in view of above problems the mechanical and dynamics analysis for an outer rotor high-speed permanent magnet claw pole motor are carried out. The rotor stress analytical calculation model was derived, then the stress distribution is calculated by...
According to the design characteristics of high speed permanent magnet synchronous motor, a 100kW, 50000r/min high speed permanent magnet synchronous motor is designed by 2D finite element method, and the electromagnetic characteristics of high speed permanent magnet synchronous motor at no-load and full-load condition are obtained by 2D finite element method. Because the sintered permanent magnet...
High speed permanent magnet motor (HSPMM) has the advantages of connecting with the load directly and getting rid of traditional mechanical increasing gear. Therefore, HSPMM is being more widely used in the industrial application and aerospace aspect recently. Inner rotor structure is generally adopted in traditional HSPMM, and in order to avoid enormous tensile stress of PM, special rotor protecting...
Permanent-magnet (PM) synchronous machines (PMSMs) can provide excellent performance in terms of torque density, energy efficiency, and controllability. However, PMs on the rotor are prone to centrifugal force, which may break their physical integrity, particularly at high-speed operation. Typically, PMs are bound with carbon fiber or retained by alloy sleeves on the rotor surface. This paper is concerned...
In this paper, according to the control requirements of the claw pole motor with PM outer rotor, a sensorless motor controller was designed based on ML4425 and PIC16F877A. Based on Matlab/Simulink, mathematical model and control system model of the motor were established. A pure hardware motor controller was designed. The controller includes a regulated power supply, ML4425 external circuit, PIC16F877A...
Due to the integrated starter generator replacing both starter motor and generator of an conventional vehicles in a single electric machine, it emissions benefits of hybrid electric vehicles propulsion. In this paper, a new permenant magnet claw pole machine applied to integrated starter generator system is proposed. The structure characteristics and operation principle are introduced, then according...
Permanent magnets hardly bear the large centrifugal force at high-speed rotation, so protective measures must be taken. Nowadays, using the carbon fiber to bindle permanent magnets are commonly used. In this paper, based on a high speed permanent magnet machine (1.12MW, 18000rpm), theory analysis of rotor stress is verified by 3D finite element method. Rotor strength of three different rotor structures...
A novel Permanent-magnet Machine with Counter-rotating Dual Rotors (PMCDR) is proposed in order to improve operation performance of underwater vehicle anti-rotation propulsion system. It can be substantially simplify system structure, decrease volume, reduce mass and cost, moreover, improve reliability without brush and slip-ring. The idea and principle of electromagnetic design are provided in order...
An axial sectional claw pole high speed square wave motor with permanent magnet outer rotor was proposed and designed which was applied in axial air compressor group to realize direct drive. Firstly, according to the core loss in high speed motor is greater, a new calculation model was built to compute core loss accurately by a way of equivalent substitution three orthogonal alternation magnetization...
Due to surface-mounted permanent magnet (PM) high speed synchronous machines need a glass or carbon-fiber bandage to fasten the magnets to the rotor surface, which increase equivalent air-gap length and decreases efficiency of heat dissipation, so a claw pole motor with outer PM rotor is presented, which is without bandage. The design process of this motor for high speed application is introduced,...
In order to improve the coupling capability and operating performance of brushless doubly fed machine(BDFM), a novel hybrid rotor structure is designed in this paper, finite element analysis(FEA) indicates that this type of rotor has higher magnetic field coupling capability, more excellent no-load characteristic and better torque capability in comparison to traditional rotor structure. The conclusions...
In view of improving performance of high frequency machine, a Multi-section Claw Pole Machine (MCPM) based on soft magnetic composite material with outer PM rotors was proposed. The structure characteristics and operating principal of MCPM were introduced. Then the calculation method of core loss based on separating iron loss modeland cogging torque based on virtual placement method was presented...
The dynamic characteristics of side bearing are one of the key factors for further study on the overall behaviour of the dynamic track stabilizer. The constitutive parameters of rubber spring were determined by the static experiment. Based on the parameters, the finite element model of side bearing was built and the reliability of side bearing model was verified by experiment. The vertical dynamic...
In order to safely test the temperature and pressure in the oil storage tanks and gas tanks, we propose a kind of method that uses fiber Bragg grating sensor to conduct real-time detection on the temperature and pressure conditions in the gas tank. Install a fiber Bragg grating as the sensor to get the temperature and pressure signal of the tank. When it changes, the central wavelength of optical...
For the Actel Fusion mixed-signal FPGA development board, this paper introduced a kind of brushless motor sensorless controller based on the Actel Fusion FPGA, with the three-phase BLDC drive circuit, achieving the continuous tone rate and jitter-free starts and stops of DC motor of the sensorless brushless, the controller has much benefits includes high integration, performance, stability and anti-interference...
This article introduces a new method called Envelope Surface Model to establish 3D geological model of Surface mine fast, aiming to simulate 3D visual mining in surface mine. Firstly the method based on the establishment of 3D terrain Model and the 3D geological model of surface mine. The mining template is determined by actual production situation of surface mine, and realizes simulating surface...
First of all, a novel axial sectional claw pole machine with PM outer rotor (ASCPM) which is suitable for pump and fan is introduced briefly, and then the structure of ASCPM is presented, too. Secondly, under the conditions of loaded and unloaded respectively, analysis of magnetic filed is made to the motor. With the method of three-dimensional finite element analysis, waveforms of torque and back-EMF...
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