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In this paper, we propose a new design of spatial-based repetitive control for rotational motion systems required to operate at varying speeds and subject to spatially periodic disturbances. The system has known model structure with uncertain parameters. To synthesize a repetitive controller in spatial domain, a linear time-invariant system is reformulated with respect to a spatial coordinate (e.g...
The paper proposes a nonlinear adaptive backstepping speed controller which can be used in both the constant-torque region and the field-weakening region for an interior-permanent-magnet synchronous motor. By using the proposed method, the adjustable speed range can be extended to 1.6 times that of the base speed. In addition, the d-axis current is suitably adjusted to increase the output torque of...
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