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This paper investigates a method of reducing vibration property of a permanent-magnet synchronous motor (PMSM) with dual three-phase windings, especially focusing on carrier harmonic component. Carrier phase shift pulse width modulation (PWM) which makes any difference between PWM carrier phase of 1st winding and 2nd winding, is applied to 24-slot 20-pole PMSM. A tested motor is manufactured and measured...
In indirectly hydrogen cooled turbine generators used in high-efficiency combined cycle power plants, improving the energy efficiency and increasing the power density are required for one of the solutions of the global environmental problems. When the output current is increased for achieving the high power density, the stray load loss at the stator end region is increased by the leakage flux from...
Large, high speed variable drive system has been realized by using 2-windings 2-pole synchronous motor and 12-pulse (2-parallel) LCI (Load Commutated Inverter). As LCI is a current source inverter, the current balance for two windings can easily be obtained. Recently, VSI (Voltage Source type Inverter) started to be applied for more than 25MW compressor drive, and a 2- to 4-parallel VSI system has...
In large capacity motor drives, torque ripple evaluation is important in order to prevent problems such as unexpected lifetime reduction caused by mechanical resonance with the load. However, enormous cost and time are necessary to measure torque ripple in large capacity motor drives. This paper discusses torque ripple calculation methods using electrical signals of a motor and then proposes an accurate...
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