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The demand for increased power and improved fuel economy are driving changes in alternator technology for automotive applications. To meet these demands requires a machine with capabilities of torque assist, regenerative braking, and power generation to supply vehicle loads while keeping the battery charged. Furthermore, to minimize add-on cost, the system must be air-cooled and operate at 12V with...
This paper addresses the influence of rotor position sensor accuracy on the performance of the Interior Permanent Magnet (IPM) motor drives used for automotive propulsion application. Analytical equations for the torque production in IPM machines show that the machine output torque drops sharply with angle error at high operating speeds. This also shows the need for rotor position feedback with high...
NVH analysis is critical for electric machine design and is used, in many applications, to separate a good (quiet) machine design from a bad (noisy) one. In this paper, a method for predicting the noise and vibration of permanent magnet synchronous machines due to electromagnetic forces is presented. Two types of fractional slot PM machines are employed as the study cases. The different skew in these...
In this paper, the influence of rotor position sensor accuracy on the performance of an Interior Permanent Magnet (IPM) motor drive for automotive propulsion is presented. Analytical equations describing the torque production in IPM machines show the need for rotor position feedback with high accuracy and resolution, especially for operation in the flux weakening region. Finite element analysis was...
Electromechanical actuators for automotive chassis application such as active/semi-active suspensions, electric power steering and electric brakes require high performance electric machines. This paper analyzes the practicality of fractional slot permanent magnet electric machines for these applications based on the full investigation of five candidate machines in terms of electrical, mechanical and...
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