By Michael V. Glazoff, Vadim S. Zolotorevsky, Nikolai A. Belov
This monograph summarizes examine performed at Moscow Institute of metal and Alloy in the course of many many years partly including Alcoa Inc.
The learn coated components of the constitution, homes, thermal resistance, corrosion and fatigue of aluminum alloys in commercial manufacturing.
Many Machinist tasks, would receive advantages from examining this book.
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This is simply done through the electronic control circuit. • Output power of the AC motor is proportional to the product of torque and speed. Output Power P ∝Tn kW The basic construction of a modern AC frequency converter is shown in the figure below. 17: Main components of a typical PWM-type AC drive The mains AC supply voltage is converted into a DC voltage and current through a rectifier. The DC voltage and current are filtered to smooth out the peaks before being fed into an inverter, where they are converted into a variable AC voltage and frequency.
When an induction motor is started 3-Phase AC induction motors 47 direct-on-line from its rated voltage supply, the stator current at starting can be as high as 6 to 8 times the rated current of the motor. As the motor approaches its rated speed, the current falls to a value determined by the mechanical load on the motor shaft. 10: Current–speed characteristic of a 3-phase AC induction motor Some interesting observations about the AC induction motor that can be deduced from the above equations are: • Motor output torque is proportional to the square of the voltage T M ∝V 2 Consequently, starting an induction motor with a reduced voltage starter, such as softstarters, star-delta starters, auto-transformer starters, etc, means that motor starting torque is reduced by the square of the reduced voltage.
At no-load, the power factor is low, which reflects the high component of magnetizing current. As mechanical load grows and slip increases, the effective rotor resistance falls, active current increases and power factor improves. 46 Practical Variable Speed Drives and Power Electronics When matching motors to mechanical loads, the two most important considerations are the torque and speed. The torque–speed curve, which is the basis of illustrating how the torque changes over a speed range, can be derived from the equivalent circuit and the equations above.