Permanent magnet hysteresis synchronous motor analysis and DSP based vector control

Qin, Ruifeng (1996) Permanent magnet hysteresis synchronous motor analysis and DSP based vector control. Doctoral (PhD) thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (19MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

The hybrid permanent magnet hysteresis synchronous (PMHS) motor has many distinct advantages over conventional permanent magnet or hysteresis motors. Based on the features of PMHS motor structure and the models of permanent magnet and hysteresis, the magnetic equivalent circuit and electrical equivalent circuit of the PMHS motor are developed. An analytical model including the derivation of state variable equations in the time domain is also developed. The transient current, torque and speed during the starting and synchronizing process have been calculated by solving the state variable equations numerically. Reasonably good agreements between the computed and experimental results of a 5 hp PMHS laboratory motor confirm the validity of the proposed analysis. -- Programmed sinusoidal pulse width modulation, which is based on the digital signal processing (DSP), is used for the PMHS motor vector control. Using the frequency domain approach, the direct and quadrature axis current controllers are developed. The control algorithms are then put into a form that could be implemented directly on the real-time digital system. Finally, an experimental verification of the algorithm is carried out by measuring the stator line current at different frequencies. -- For the speed controller design, first, the general expression of the developed torque of the PMHS motor is derived. Upon controlling the stator current ids to be zero, iqs becomes the only controllable variable. The speed controller design is based on the symmetry optimization. The performance of the speed controller is then demonstrated with several real-time experiments, and it is shown to possess the desired characteristics in terms of rise time and overshoot. The rotor position and speed responses are quite smooth in a wide speed range and without any oscillation. -- The complete experimental DS1102 DSP based drive system has been built. A detailed description of the system general hardware and software is discussed. Finally, the experimental results of a DSP based PMHS motor vector control system are given. The motor is controlled successfully at inverter frequencies 1 Hz to 60 Hz . -- The transient and steady state performances of current and speed show that the vector control of the PMHS motor has important features for smooth and quiet operation over a wide range of speed. The experimental results verify the effectiveness of the motor models for high performance PMHS motor drive.

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