skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Optimal current control strategies for surface-mounted permanent-magnet synchronous machine drives

Abstract

The current waveforms for optimal excitation of surface-mounted permanent-magnet synchronous machines are set forth. Four different modes are considered, involving varying degrees of minimization of rms current and torque ripple. The optimized waveforms are markedly different than the traditional sinusoidal or rectangular excitation schemes. Inclusion of cogging torque and arbitrary degree of torque ripple minimization generalize this work over that of previous authors. An experimental drive and a detailed computer simulation verify the proposed control schemes.

Authors:
; ;
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (US)
OSTI Identifier:
20080370
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Energy Conversion (Institute of Electrical and Electronics Engineers); Journal Volume: 14; Journal Issue: 4; Other Information: PBD: Dec 1999
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ELECTRIC GENERATORS; ELECTRIC MOTORS; PERMANENT MAGNETS; EXCITATION SYSTEMS; CONTROL; OPTIMIZATION; ENERGY EFFICIENCY

Citation Formats

Chapman, P.L., Sudhoff, S.D., and Whitcomb, C.A. Optimal current control strategies for surface-mounted permanent-magnet synchronous machine drives. United States: N. p., 1999. Web. doi:10.1109/60.815026.
Chapman, P.L., Sudhoff, S.D., & Whitcomb, C.A. Optimal current control strategies for surface-mounted permanent-magnet synchronous machine drives. United States. doi:10.1109/60.815026.
Chapman, P.L., Sudhoff, S.D., and Whitcomb, C.A. 1999. "Optimal current control strategies for surface-mounted permanent-magnet synchronous machine drives". United States. doi:10.1109/60.815026.
@article{osti_20080370,
title = {Optimal current control strategies for surface-mounted permanent-magnet synchronous machine drives},
author = {Chapman, P.L. and Sudhoff, S.D. and Whitcomb, C.A.},
abstractNote = {The current waveforms for optimal excitation of surface-mounted permanent-magnet synchronous machines are set forth. Four different modes are considered, involving varying degrees of minimization of rms current and torque ripple. The optimized waveforms are markedly different than the traditional sinusoidal or rectangular excitation schemes. Inclusion of cogging torque and arbitrary degree of torque ripple minimization generalize this work over that of previous authors. An experimental drive and a detailed computer simulation verify the proposed control schemes.},
doi = {10.1109/60.815026},
journal = {IEEE Transactions on Energy Conversion (Institute of Electrical and Electronics Engineers)},
number = 4,
volume = 14,
place = {United States},
year = 1999,
month =
}
  • This paper is concerned with the problem of adaptive fuzzy dynamic surface control (DSC) for the permanent magnet synchronous motor (PMSM) system with chaotic behavior, disturbance and unknown control gain and parameters. Nussbaum gain is adopted to cope with the situation that the control gain is unknown. And the unknown items can be estimated by fuzzy logic system. The proposed controller guarantees that all the signals in the closed-loop system are bounded and the system output eventually converges to a small neighborhood of the desired reference signal. Finally, the numerical simulations indicate that the proposed scheme can suppress the chaosmore » of PMSM and show the effectiveness and robustness of the proposed method.« less
  • This paper develops an analytical approach based on a qd0 reference frame model to analyze dynamic and steady state characteristics of disc permanent magnet linear synchronous machines (DPMLSMs). The established compact mathematical model can be more easily employed to analyze the system behavior and to design the controller. Superiority in operational electromagnetic characteristics of the proposed DPMLSM for electric vehicle (EV) applications is verified by both numerical simulations and experimental investigations.
  • Today the interest is increasing to use inverter-fed permanent-magnet (PM) synchronous motors in variable-speed drive applications. A problem is the difficulty to obtain a sufficiently large field-weakening range. Especially for surface-mounted permanent-magnet (SMPM) motors, having the highest power density in relation to the required magnet material, this problem is very pronounced. An alternative method is studied how to obtain a sufficiently wide field-weakening range. The basic idea is to connect different coil groups of the stator winding in different configurations. In this way an extension in the speed range is obtained comparable to the field-weakening range of asynchronous motor drives.more » The influences on the motor design are studied and an example of a SMPM motor design is presented together with possible switching arrangements.« less
  • The general question of when and why one should use a Halbach rotor in the design of surface-mounted permanent-magnet synchronous motors is addressed. The torque production capabilities of Halbach and conventional magnet arrays under the constraints of fixed magnet volume, and fixed power dissipation in slotless armature windings, are compared and the results presented in a graphical manner along with intuitive models that qualitatively explain these results. They conclude that, for permanent-magnet synchronous motors where the application precludes the use of a magnetic back-iron, the Halbach array always produces higher torque than the conventional array, for the same volume ofmore » magnets. The use of a magnetic back-iron in both designs increases the achievable torque. However, for magnetically-backed rotors, the conventional array, with an optimized pole-arc to pole-pitch ratio, produces higher torque than the Halbach array up to a certain thickness of magnets. Above this thickness, the Halbach array produces a higher torque.« less
  • The synchronous reactances of permanent magnet (PM) motors have been determined using: (1) analytical method, i.e., form factors of the stator field (armature reaction factors), (2) finite element method (FEM), and (3) experimental tests on a special machine set. The analytical method is widely used in calculations of synchronous reactances of salient pole synchronous machines with electromagnetic excitation. Rotors of PM synchronous machines have more complicated structures, hence it is more difficult to predict accurately the magnetic field distribution in their airgaps in order to find the form factors of the stator field. Numerical methods of field analysis can easilymore » solve this problem. The FEM can predict both the synchronous and mutual (armature reaction) reactances in the d and q axes. The leakage reactance can then be evaluated as a difference between synchronous and mutual reactances. As an example, a small, three-phase, four-pole motor with SmCo surface mounted PM`s (three parallel magnets per pole), and mild-steel pole shoes has been investigated. Such a complicated rotor structure has been intentionally designed in order to be able to compare the advantages and disadvantages of the analytical method and the FEM. In the FEM, the reactances have been calculated using both the flux linkage and current/energy perturbation method. Synchronous reactances as functions of the stator current and load angle obtained analytically from the FEM modeling and from measurements have been compared.« less