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A simple robust control method based on an observer with a multiple integrator plant model is investigated for a DC motor based drive with a flexible load. The problem of controlling the drive with unknown parameters and an external load torque is converted to the simple task of state control of the known plant model. The only information required for commissioning is the specified closed loop dynamics...
This research work presents a new and efficient design methodology for the specification, development and manufacture of permanent magnet sychronous motors (PMSMs). In this paper a genetic algorithm based design optimisation technique for PMSMs is presented in which the multi-criteria considered in the optimisation are the electromagnetic performance, the thermal performance and the material cost...
Design and verification of forced dynamics position control of a drive with a linear permanent magnet synchronous motor is presented. This control method is a relatively new one and using the principles of feedback linearisation offers an accurate realisation of a dynamic speed and position response, which can be selected for a given application by the user. In addition to this, the primary part current...
The paper presents comparison of two control techniques (a) sliding mode and (b) forced dynamics for control of electric drives employing permanent magnet synchronous motors with flexible coupling. The designed controllers are of the cascade structure, comprising an inner speed control loop and an outer position control loop. The inner speed control loop for both controllers is based on forced dynamics...
A control system based on the principle of forced dynamics control for an electric drive with a permanent magnet synchronous motor and a flexible coupling is presented and verified by simulations. The controller is of the cascade structure, comprising an inner speed control loop and an outer position control loop. The inner forced dynamics speed control loop respects the principles of vector control...
Analytical and FEA predictions of cogging torque are compared with experimental results for a range of non-skewed PMSMs of similar size but with slot/pole ratios of 18/8, 12/10 and 30/8 (fractional) together with 30/10 and 18/6 (integer). The two analytical methods and the experimental data show close agreement and predict that stator or rotor skewing would be required to reduce the cogging torque...
This paper concentrates on the development and analysis of a new generic steady state thermal model for mapping the heat transfer throughout a permanent magnet synchronous motor by considering its individual components as elements of an overall thermal equivalent circuit. This model includes (a) conduction resistances for the stator laminations and housing, conduction resistances between the copper...
As part of the design process of surface mounted permanent magnet synchronous motors (PMSM), a combination of analytical calculation and finite element analysis (FEA) is proposed for the cogging torque calculation. The analytical methods are recommended for the initial design iterations in view of their high computational speed. In general, however, finite element analysis is more accurate and is...
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