Optimal Unity Power Factor Control of Permanent Magnet Sychronous Motor with q-axis Field by Inverse LQ Method

Hiroshi Takami; Hiroshi Takami

Optimal Unity Power Factor Control of Permanent Magnet Sychronous Motor with q-axis Field by Inverse LQ Method

Hiroshi Takami

Vol. 1, No. 2, pp. 117-126, Oct. 2001

10.6113/JPE.2001.01.2.117

Permanent magnet sychronous motor

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Abstract

A synchronous motor (SM) with q-axis special field winding of which the q-axis field-current compensates and cancels armature reaction can be driven at unity power factor under the conditions of transient state as well as steady state. The motor operates in high efficiency in all conditions. However, in order to obtain maximum performance of the motor, it is required that the time constant of armature circuit corresponds to that of q-axis field circuit. Inverse LQ (ILQ) design method on a basis of the pole assignment is suitable for this problem- (1) The time constants of the output responses can be designed for desired specifications, (2) Relations between feedback gains and response of closed loop system are very clear and (3) Optimal solutions can be given by simple procedure of ILQ method without solving the Riccati's equation, compared to the usual LQ design method Accordingly, the ILQ method can make the responses of armature current and q-axis field-current correspond In this paper, it is proved by numerical simulations and experiments that the ILQ method is very effective for optimal regulator design of this plant and realizes a high-performance motor with unity power factor and high efficiency.

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Cite this article

[IEEE Style]

H. Takami and H. Takami, "Optimal Unity Power Factor Control of Permanent Magnet Sychronous Motor with q-axis Field by Inverse LQ Method," Journal of Power Electronics, vol. 1, no. 2, pp. 117-126, 2001. DOI: 10.6113/JPE.2001.01.2.117.

[ACM Style]

Hiroshi Takami and Hiroshi Takami. 2001. Optimal Unity Power Factor Control of Permanent Magnet Sychronous Motor with q-axis Field by Inverse LQ Method. Journal of Power Electronics, 1, 2, (2001), 117-126. DOI: 10.6113/JPE.2001.01.2.117.