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To verify the FEM simulation of the air-gap flux density, it is necessary to measure the flux density distribution as function of the angular machine position. This paper presents a scalable 3-D direct air-gap flux density magnitude measurement system for rotating electrical machines. A combination of eight linear Hall effect flux sensors and a rotary encoder is used to measure the flux density magnitude...
In this paper, a maximum torque control strategy for three-phase 24-slots 14-poles outer-rotor dc-excited flux switching motor drive is presented. The machine was designed for traction applications. The mathematical model for the generated torque was analyzed first, and a maximum torque control law was derived based on the model. The motor parameters were found via the finite-element analysis results...
In the field of high-precision position control, the position response requires that there is no vibration. However, a permanent magnet synchronous motor (PMSM) has a wide variety of torque-ripple components, including cogging torque and flux harmonics, which degrade the control performance. Typically, these components are defined as a disturbance torque, and compensation is accomplished by using...
This paper proposes a novel circular winding brushless DC (CWBLDC) machine with low torque ripple. The multiphase armature winding of the machine is very similar to that of a brushed DC machine but with permanent magnet excitation on the rotor. Phase current commutation is realized by power electronic circuitry operating in either natural or forced commutation mode. By employing specific fractional-slot...
This paper presents gain scheduling H2 controller for speed control of permanent magnet synchronous motors (PMSMs) in the sense of linear parameter varying (LPV) synthesis. First, the nonlinear dynamics of a PMSM is transformed to a LPV system which has state-dependent varying parameters. The proposed method is composed of torque modulation, commutation scheme and H2 controller based on parameter-dependent...
In this paper, the optimization process of a rotational Electro-Mechanical Actuator (EMA) for an Aerospace application is presented. Specifically, the EMA is designed for the extension and retraction of a landing gear. The main aim of the optimization process is the minimization of the overall weight of the system whilst maintaining the system dependability. Since the EMA is composed of different,...
High efficiency, high power density and wide constant power region are all the required functions of the traction motor and drive in electric vehicle applications. However, these requirements are mainly dependent on the output line voltage utilization of the motor drivers. Generally, electric vehicle use over-modulation to increase voltage utilization under constant output voltage of battery. A six-step...
A circular winding brushless DC (CWBLDC) machine is essentially a trapezoidal-EMF multiphase permanent magnet machine with the associated commutation circuit. It can achieve the same level of torque ripple performance as sinusoidal-EMF permanent magnet synchronous machines (PMSMs), yet boast much higher torque density since the iron core is more fully utilized with trapezoidal EMFs. The commutation...
In electric and hybrid-electric vehicles, the inverter output voltage is limited by available DC-link voltage, which restricts the vehicle speed and acceleration. Therefore the fundamental component of the motor voltage should be increased by operating inverter in the six-step mode at high speeds. Although hysteresis based direct torque control (DTC) is a straightforward approach and has several advantages,...
This paper presents a current control method applied to permanent magnet synchronous motors using sliding mode controller and disturbance observer. The current control is carried out at dq synchronous reference frame. The proofs of stability are developed from the Lyapunov analysis requirements. A sliding mode rotor speed observer is combined with the proposed current control scheme. Simulations results...
We present the design of a permanent magnet synchronous motor (PMSM) for wide temperature range applications. The designed motor will operate within a temperature range of −60 °C up to 300 °C, have an output power of 12 kW at 12 krpm rotating speed, and maintain an efficiency greater than 90%. The design calls for good performance over a speed range of 8 krpm to 16 krpm. The stator material in the...
This paper presents a two-degree-of-freedom (2-DOF) direct drive motor to achieve flexible motion control. As one of the motion control methods, robust position control is significant in order to functionalize industrial robots, machine tools, medical robots, and so on. Furthermore, these requires multi-degree-of freedom motion. Then the authors have proposed 2-DOF direct drive motor, which realizes...
Linear permanent magnet machines (LPMMs) are widely used in the industrial field for its high-performance of position accuracy, acceleration, deceleration, and tracking characteristics. In addition, LPMMs have no transmission error and backlash owing to the direct drive system. However, the direct drive system is easily affected by disturbance. If the system contains several LPMMs, the movement of...
In this paper, design and model of new structure of Spiral Motor is proposed. This motor consists of a mover and stator with helical shape. In addition, the stator which has claw shape, where makes winding coils become more easily to manufacture than in convention helical motors. The equivalent magnetic circuit, voltage equations and motion equations are described. Finally, by using Finite Element...
This paper deals with the identification and analysis of an electric drive configuration at system level. In terms of efficiency and power density, the investigation is intended to enable a statement whether the ideal electric motor application is a direct drive or a combination with a gearbox in the drive gondola of a Do 128-6 aircraft. In this research, seven versions of electrical drive combinations...
Recently, Intelligent Transport Systems (ITS) technology have been intensively studied to solve environmental and energy problems by improving traffic flow. Along with the development of ITS and autonomous driving technologies, vehicle velocity control has to be considered for energy efficiency. In this paper, a minimum time autonomous driving (MTAD) system, which minimizes the traveling time considering...
Recent research suggest many flux weakening control techniques for interior permanent magnet synchronous motors. The most established one is the use of two current controllers to control the direct and quadrature axis current components such that the total flux linkage is reduced. If the characteristic current of the motor is less than the rated current of the system, maximum torque per voltage control...
Utilization of renewable energy has become the future trend in the trucking industry. Electrical power generated from renewable energy can replace part of the fuel energy. There is usually limited space for storing on-board battery. Thus, to better utilize the battery power, it becomes critical to have an efficient energy conversion device that can transfer energy from battery to amenities such as...
This paper provides an alternative method for high resolution position estimation of a BLDC motor by obtaining pulses from the hall effect sensor. This method proposes to use a fast processing time in order to achieve the best performance. In the document the development of the methodology is shown for obtaining the high resolution position. The problem is the low resolution and it is due to the hall...
Optimization plays a crucial role to bring out a trade-off between the cost and efficiency of permanent magnet motors. Optimization algorithm coupled with analytical magnetic circuit analysis, is one such technique to improve the performance of a motor. However, the non-linear effects like saturation, cross-magnetization, etc. are cumbersome to be modelled analytically. In addition, the interdependency...
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