H. A. Toliyat

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A pattern recognition technique based on Bayes minimum error classifier is developed to detect broken rotor bar faults and static eccentricity in induction motors at the steady state. The proposed algorithm uses stator currents as input without any other sensors. First, rotor speed is estimated from stator currents, then appropriate features are extracted.(More)
A five-phase brushless permanent-magnet (PM) motor is introduced. The proposed motor has concentrated windings such that the produced back electromotive force is almost trapezoidal. The motor is supplied with the combined sinusoidal plus third harmonic of currents. This motor, while generating the same average torque as an equivalent PM brushless dc motor(More)
In this paper, a control strategy that provides fault tolerance to five-phase permanent magnet motors is introduced. In this scheme, the five-phase permanent magnet (PM) motor continues operating safely under loss of up to two phases without any additional hardware connections. This feature is very important in traction and propulsion applications where(More)
Utilization of multi-phase machines in variable speed drives is nowadays extensively considered for electric ship propulsion, 'more-electric aircraft' and traction applications, including EVs and HEVs. In addition to well-known advantages, use of multi-phase machines enables independent vector control of a certain number of machines that are connected in(More)
Induction motors, both three and single phase, are used extensively for adjustable speed drive applications. These machines are structurally very robust and are primary source of motive power and speed control where DC machines cannot be used. For closed loop control of these machines, sensorless speed estimation is usually preferred. Among the current(More)
High torque pulsation is a major disadvantage of most interior permanent-magnet (IPM) motor configurations. Choosing the proper number of stator slots and winding distribution as well as increasing number of phases are among the possible solutions for reducing torque pulsation. In this paper, five-phase IPM motor with fractional-slot stator is studied. It(More)
In response to electric energy crisis and power quality concerns, a simple and low cost variable speed doubly fed electric alternator/active filter (IDEA) for wind energy conversion systems is proposed. The proposed IDEA is capable of simultaneous capturing maximum power of wind energy with fluctuating wind speed and improving power quality, that are(More)
Fault diagnosis of electrical machines is gaining particular importance in view of machine downtime and revenue losses to the industry. Often, these machines run critical loads and their sudden breakdown can be catastrophic. Thus, the drive system of the motor should also have diagnostic features to predict machine faults at their very inception.(More)
Two series-connected two-motor drive systems with a single inverter supply have been proposed recently. The first one consists of two five-phase machines supplied from a single five-phase inverter, whereas the second one comprises one symmetrical six-phase machine, a three-phase machine, and a single six-phase inverter. It has been verified experimentally(More)
A new converter topology is proposed for driving a switched reluctance motor with unipolar currents. It consists of a front-end single-ended primary inductance converter (SEPIC) and a switch in series with each motor phase. All the switches are ground-referenced, which simplifies their gate drives. The available input voltage can be boosted for better(More)