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Published in:
2021 | OriginalPaper | Chapter
AC Machines: Permanent Magnet Synchronous and Induction Machines
Authors : A. H. Ranjbar, Babak Fahimi
Published in: Electric, Hybrid, and Fuel Cell Vehicles
Publisher: Springer New York
Abstract
Field-oriented control
Field-oriented control was introduced in the beginning of 1970s. It demonstrated that an induction motor or synchronous motor could be controlled similar to that of a separately excited DC motor by the orientation of the stator mmf or current vector in relation to the rotor flux to achieve a fast dynamic response in the electromagnetic torque.
Induction machine (IM)
A type of electrical machines that operates based on the principle of induction. While stator is formed by a multiphase AC winding, the rotor houses is (a) a series of short-circuited bars in the form of a squirrel cage or (b) a multiphase AC winding. The latter rotor form will allow for external injection of the current. In this family of electric machines, speed of the rotor is not an integer multiple of the stator frequency, and as such, they are named asynchronous machines.
Interior permanent magnet (IPM)
A type of PMSM where, unlike SM-PMSM, permanent magnets are mounted such that a magnetic saliency is established.
Permanent magnet material
Permanent magnet used in PMSM is a piece of magnetic material which, once magnetized or “charged” by an external magnetic field, retains a usefully large magnetic moment after the magnetizing force is removed. Thus, a permanent magnet becomes a source of magnetic field in the rotor.
Permanent magnet synchronous machine (PMSM)
PMSM is an electromechanical energy conversion device that forms as an important category of electric machines. This machine comprises an AC stator and a brushless rotor that houses permanent magnet. Since the frequency of the excitation in the stator winding is proportional to the mechanical speed of the rotor, this family of machines is called “synchronous.” PMSM is being considered for variety of applications including electric propulsion of modern vehicles.
Surface-mounted PMSM (SM-PMSM)
A type of PMSM where permanent magnets are placed on the surface of the rotor, making it easy to build, and skewed poles are easily magnetized on this surface-mounted type to minimize cogging torque.
