#frequency
Documents
Autres
Variação percentual e freqüencia de alimento fornecido no desenvolvimento final de jundiás (Rhandia quelen) a fase de pós-larvas (Percentage variation and frequency of food supplied in the final development of silver catfish (Rhandia quelen) in the post larvae phase)
9 pages
Português
Documents
Autres
El papel del status léxico y de la frecuencia del estímulo-señal en la condición no relacionada con la técnica de presentación enmascarada del estímuloseñal (The role of the lexical status and the frequency of the unrelated prime in the masked priming technique)
10 pages
Español
Documents
Rapports de stage
General Description The MAX2605–MAX2609 are compact high performance intermediate frequency IF voltage controlled oscillators VCOs designed specifically for demanding portable wireless communication systems They combine monolith ic construction with low noise low power operation in a tiny pin SOT23 package These low noise VCOs feature an on chip varactor and feedback capacitors that eliminate the need for external tuning elements making the MAX2605–MAX2609 ideal for portable systems Only an external inductor is required to set the oscillation frequency In addition an integrated differential output buffer is provided for dri ving a mixer or prescaler The buffer output is capable of supplying up to 8dBm differential with a simple power match It also provides isolation from load impedance variations The MAX2605–MAX2609 operate from a single 7V to 5V supply and offer low current consumption These IF oscillators can cover the 45MHz to 650MHz frequency range
15 pages
English
Documents
Rapports de stage
INTRODUCTION An induction motor can run only at its rated speed when it is connected directly to the main supply However many applications need variable speed operations This is felt the most in applications where input power is directly proportional to the cube of motor speed In applications like the induction motor based centrifugal pump a speed reduction of results in an energy savings of approximately Driving and controlling the induction motor efficiently are prime concerns in today's energy conscious world With the advancement in the semiconductor fabrication technology both the size and the price of semiconduc tors have gone down drastically This means that the motor user can replace an energy inefficient mechani cal motor drive and control system with a Variable Frequency Drive VFD The VFD not only controls the motor speed but can improve the motor's dynamic and steady state characteristics as well In addition the VFD can reduce the system's average energy consumption Although various induction motor control techniques are in practice today the most popular control tech nique is by generating variable frequency supply which has constant voltage to frequency ratio This technique is popularly known as VF control Generally used for open loop systems VF control caters to a large num ber of applications where the basic need is to vary the motor speed and control the motor efficiently It is also simple to implement and cost effective The PIC16F7X7 series of microcontrollers have three on chip hardware PWM modules making them suitable for phase motor control applications This application note explains how these microcontrollers
24 pages
English
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