M.A. Jabbar

Space-vector Modulation in a two-phase induction motor drive for constant-power operation

In the paper, a space-vector pulsewidth-modulation (SVPWM) inverter is proposed for constant-power operation of a two-phase induction motor. The operating principle of SVPWM is described, and the algorithm for constant-power operation is presented. Analysis for dynamic operation using a simple scalar control scheme is carried out and parameters for implementation of the scheme are obtained. Experimental investigation of the scheme is carried out and comparative analysis of the performance of the scheme is presented.

Disk drive spindle motors and their controls

Disk drives require very high-precision spindle motors for fast and accurate access of data. As storage capacity and access rate increase, more demands are being made of spindle motors with respect to both electrical and mechanical performances. For error-free operations, spindle motors are required to comply with a host of requirements, such as run-outs, both axial and radial, acoustics, mechanical vibrations, electromagnetic interference, contamination, etc. Compliance to these requirements necessitate careful and novel design techniques and highly sophisticated manufacturing processes. This paper discusses various requirements and specific design issues (electromagnetic design, mechanical design, motor control) for the development of spindle motors suitable for different form-factor drives using permanent magnet brushless DC motors.

Optimization of the constant power speed range of a saturated permanent-magnet synchronous motor

This paper proposes an optimization procedure for interior permanent-magnet synchronous machines to achieve wide-speed operation. This method applies on motors with a finite maximum speed. The method takes into account the effect of saturation. Nonlinear models of the d- and q-axes flux linkages are obtained from finite-element analysis and are used to derive the power capability of the machine. These models are combined with response-surface method and genetic algorithms to optimize its constant power speed range

Determination of Parameters for Internal Permanent Magnet Synchronous Motors

Experimental methods used recently by many researchers for the determination of PMSM parameters have been reviewed. Analysis and experimentations show many shortcomings and inaccuracies involved in those methods. Two novel techniques for better results through the application of linear regression and neural network are presented, and the results from these methods are also included. In addition, computational design values obtained using finite element method are also compared to the experimental values

Application of response surface methodology (RSM) in design optimization of permanent magnet synchronous motors

This paper proposes a novel computational approach to design optimization of permanent magnet synchronous motors (PMSM) with respect to some specific performance requirements. This new approach adopts finite element method as a magnetic field analysis tool for the design of experiments for the use of response surface analysis and the genetic algorithm as a searching tool for optimization work. The response surface methodology (RSM) determines the empirical models relating the performance of a motor and the design variables. This design and optimization approach were applied to permanent magnet synchronous motors and resulted in enhancing the performance of these motors.

DSP based space vector PWM drive for constant power operation of two-phase induction motors

A novel space vector pulse-width modulated (SVPWM) inverter is proposed for constant power operation of two-phase induction motors. The operating principle of SVPWM is described. The algorithm for constant power operation is presented. Some critical issues in the design of a two-phase inverter-driven induction type appliance motor are discussed. Results of experimentation are also provided at the end of the paper.

Optimization of the constant power speed range of a saturated permanent magnet synchronous motor

This paper proposes an optimization procedure for interior permanent magnet synchronous machines to achieve wide speed operation. This method applies on motors with finite maximum speed. The method takes into account the effect of saturation. Non-linear models of the d- and q-axis flux linkages are obtained from finite element analysis and are used to derive the power capability of the machine. These models are combined with response surface method and genetic algorithms to optimize its constant power speed range

Quasi-resonant-converters-based high-efficiency spindle motor drives for magnetic data storage

Disk drive spindle motors require accurate speed control and highly efficient drive controllers. Small-volume and high-efficiency converters are of particular interest for portable data storage applications. Quasi-resonant voltage controllers are described in this paper and the experimental results are presented. In contrast to the conventional pulsewidth-modulated voltage controller, this technique reduces the switching loss and enables the controller to operate at very high frequencies. Three types of resonant converters are built and tested for the application. A comparison of performance in terms of losses and voltage regulation is given.

Development of a high-speed AC brushless appliance motor

This paper describes the development of a high-speed brushless AC motor for domestic appliances. Some critical issues in the design of a two-phase inverter-driven induction type appliance motor are discussed. A novel space vector modulation method for the two-phase system is introduced. The results of experimentation are also presented.