For the base speed, the rated current isn is: (9.76) (9.77)
{"Image DocumentName": "For the base speed, the rated current isn is: (9.76) (9.77)", "Image ImageDescription": "(9.73) (9.74) (9.75) For the base speed, the rated current isn is: (9.76) (9.77) So even this narrow constant power speed range ratio wmax1 / wb = 1.33 is obtained at the price of higher stator current which implies lower power factor and, perhaps, efficiency. Reducing Lsc is a sure way to increase the value of wmax1 (9.71) and thus a wider constant power speed range is obtained. Leaving a voltage reserve at base speed or switching from star to delta winding connection in the motor are two practical methods to widen the constant power zone. Electric Drives.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}