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This paper discusses the design of a brushless permanent magnet motor in which the performance requirement is dominated by breakout torque. It discusses the impact of a rotor position feedback error and how it affects the machine sizing in order to overcome breakout torque requirements. It is shown that the brushless AC drive is less sensitive to the position error compared with the brushless DC drive,...
This paper examines fault tolerant power converter topologies and develops a technique for producing data to compare the reliability of topologies. The various states of fault-tolerant systems are modelled, following which reliability curves and failure rate data is constructed.
This paper describes the thermal modeling of a brushless dc motor and brake solenoid for electro-mechanical actuators developed for a prototype more electric aircraft engine. Lumped-parameter thermal circuits were modeled using a commercial package for the motor. An in-house tool was used to model the transient behavior of the solenoid, which was solved using the SimPowerSystems toolbox of Simulinkreg...
This paper investigates the effect of stator slot shape on the accuracy of a saliency based zero-speed sensorless position estimation technique for brushless permanent magnet machines. Three machines with different rotor topologies are used as the basis of the finite element analysis and for each machine, experimental tests are carried out to verify the accuracy of the models. It is shown that the...
The impact of rotor design on the accuracy of a saliency based zero-speed sensorless position estimation technique is investigated. An existing prototype machine is used as the basis of the development and a number of possible buried magnet rotor designs are analysed before an optimal design is selected. It is shown that whilst it is possible to achieve the desired torque from a number of rotor variants,...
This paper discusses the design of a fault-tolerant electric motor for an aircraft main engine fuel pump. The motor in question is a four-phase fault-tolerant motor with separated windings and a six-pole permanent magnet rotor. Methods of reducing machine losses in both the rotor and stator are introduced and discussed. The methods used to calculate rotor eddy current losses are examined. Full three-dimensional...
This paper discusses the design of a fault tolerant electric motor for an aircraft main engine fuel pump. The motor in question is a four phase fault tolerant motor with separated windings and a six pole permanent magnet rotor. Methods of reducing machine losses in both the rotor and stator are introduced and discussed. The methods used to calculate rotor eddy current losses are examined. 3D finite...
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