# Tagged Questions

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### Changing the torque and excitation in an alternator

What is the effect of changing the input torque of an alternator with excitation kept constant? and what is the effect of changing its excitation with a constant torque?
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### Armature and field mmf axes in synchronous machines

In the book "Electrical Machines and Technology" by J.Hindmarsh, in the chapter about synchronous machines, it stated that for the machine to develop a uniform torque, the armature and field mmf axes ...
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### Synchronous Counter to go through sequence 1,2,5,6,3,4,7,0

I have been working on a question which is: Design a synchronous up-counter that goes through the sequence 1 2 5 6 3 4 7 0 and then repeats. Implement the counter using D flip-flops. So Far I have ...
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### Multiple Demultiplexers In Series

Basically I need some demultiplexers to switch between 24 outputs. The data inputs would be connected to counters for the addresses. I'm currently using 74ls138 3-8 line demultiplexers. Is this ...
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### How many measurement samples does a typical phasor measurement unit (PMU) transmit in each communication session?

Given a smart grid network, how many measurement samples (voltage and phase angles) does a typical PMU capture from a transmission line? I know that in each communication session, a PMU transmits ...
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### Synchronous generator mechanical characteristic

Why does the synchronous generator produce a torque just in correspondence of the synchronous speed, that is why is he mechanical characteristic just a straight vertical line in $\omega = \omega_S$ ...
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### Finite State Machine Design for Entering/Exiting Door Sensor

I have attached an image of the assignment. I don't need to physically build it, just draw it using flip flops, mulitplexers, and logic gates. Not sure where to start at all. I appreciate any pointers ...
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### Source synchronous vs Common clock methodology in Physical design

I understand common clock and source synchronous clock. From this link http://referencedesigner.com/books/si/common-vs-source-sync.php. What i do not understand 1) How is maximum frequency attained ...
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### ACB vs Contactor for synchronous generators

I've been told by an experienced electrical engineering colleague that it is preferred to use an ACB rather than a contactor for making and breaking the connection to a synchronous generator, but he ...
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### 8 bit PICs: timer1 asynchronous vs synchronous operation

The 8-bit PIC family (I'm working with pic18f46k22) offers some timers (timers1/3/5) that can work in both asynchronous and synchronous modes when clocked from an external source. The obvious ...
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### Difference between D-Type Flip-Flop and Edge-Triggered D-Type Flip-Flop

I need to create a JK Flip-Flop using a D Flip-Flop, a 2-to-1 line MUX and an inverter. I wasn't really familiar with latches and Flip-Flops, but I understand the difference and how Flip-Flops are ...
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### Definition of terms for a Synchronous Current-mode Buck Regulator?

I was reading the datasheet of MP1482 chip which is buck regulator, I have read some of terms in the datasheet I did not understand could any one explain it in simple world. The MP1482 is a ...
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### Common way of describing a “double-sided wait”

Is there a commonly used name to describe a "double-sided wait" data transfer protocol? This is a uni-directional scheme in which data is transferred on the clock edge if both the sender and the ...
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### Short circuit transients in synchronous generators

When the three terminals of generator are suddenly shorted out the short circuit fault current has both ac & dc component. i am guessing that this as inductor current can not change ...
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### Counter with 4 flip flops jk synchronous from 3 to 13 [duplicate]

I have to create a counter with 4 flip flops jk synchronous. The counter shall count in this order: 3 to 13 and then to 3 to 13 and so on.. I have to use logisim simulator. Until now what i´ve ...
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### Counter with 4 flip flops jk synchronous from 3 to 13!

I have to create a counter with 4 flip flops jk synchronous. The counter shall count in this order: 3 to 13 and then to 3 to 13 and so on.. I have to use logisim simulator. Ok. So i think its ...
221 views

### Transmitting PWM binary at 400kbps (or 800kbps)

I need to send a string of bits to a chained set of RGB LEDs, each of which have their own controller IC. The datasheet for that IC, the WS2811, is here. The protocol is quite simple: each bit, both ...
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### Synchronous Serial over Internet

I have a portable diagnostics tool which communicates with an electronic appliance using which I believe is Synchronous Serial Interface (SSI). I'm looking for a way that I can extend the range of ...
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### Simultaneous electronic shutter release for multiple Lumix G7 cameras

I'm trying to trigger six Panasonic Lumix G7 cameras at once. The trigger mechanism uses a four pole 2.5 mm plug, some resistors and two switches. With no switch closed there is 41 kilohms of ...
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### driving a synchronous motor as a generator

Say I have a 100 kW synchronous motor in a building driving a pump/fan etc as part of an HVAC system. 1 - if I drive the shaft of the motor at 100 KW (from somewhere else), then the load on the ...
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### Change same signal at either rising or falling state of a signal

I am bit new to VHDL, and hope some of you guys could help me here. I trying to establish a connection between an ADC, LED, and control component. The purpose of this application is to convert an ...
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### What is the difference between zero leading and zero lagging?

The armature reaction of an alternator will be completely magnetising when load power factor is A unity B zero lagging C zero leading D 0.8 lagging Though ...
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### Synchronous rectification simulation [closed]

I am (for educational and research purposes) trying to replace diodes with MOSFETs in a rectifier of a conventional automotive alternator (12V). Before I proceed with hardware implementation, I ...
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### Salient pole vs cylindrical rotor

Why is the salient pole rotor in a synchronous machine made of laminated steel whereas a cylindrical rotor does not have any lamination?
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### How can a synchronous motor have RPM other than 3000/3600?

It is said, that synchronous motor is rotating at the same speed as magnetic field rotates. But three-phase made magnetic field rotates as the frequency of current, i.e. 50 or 60 times per second, ...
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### Calculation for the Boot Strap capacitor

For design of a synchronous buck converter (which would be used to charge the battery) which would be driven by Micro-controller's PWM output, i selected the IRLB8748 NMOS Power transistors (for both ...
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### High Drain Current MOSFET vs Low Drain Current MOSFET for Synchronous Buck Converter

For a battery charging application, i have to build a synchronous buck converter (i/p voltage = 12V , o/p Voltage = 4.5V) which would be driven by a PWM signal from the micro-controller. This Buck ...
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### Why do some microcontrollers have such huge synchronization delays?

On the Atmel SAM-D21 series microcontrollers, many peripherals use a clock which is asynchronous to the main CPU clock, and accesses to these peripherals must go through synchronization logic; on ...
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### Syncronization Flip-flops

I've a doubt about clock domains and synchronization FF. I'm working on a FPGA and I've two clock domains. In the firs clock domain there is a clock frequency of 125 MHz, in the second the frequency ...
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### Available synchronous buck converter chips are bidirectional (current)?

I was going through available synchronous buck converter ICs with external PWM capability (which can be controlled with the help of a micro-controller) and i found this one for e.g. I have read in a ...
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### Synchronous decade counter only 3 AND gates

I need a design for a synchronous decade counter that can have no more than 3 gates, excluding the JK's. I do not need to design this myself as it is considered above the level of course I am doing, I ...
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### Factors determining number of turns in field winding of Sychronous generator

the question is simple, based on what factors do I choose the right number of turns in field winding (for synchronous generator)? It seems like the less turns there are, the more DC current is needed ...
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### Shift register on sync RS flip-flop

I am trying to build serial-in shift register (non cycled) based on synchronous RS flip-flop, but i'v got a problem with synchronization. My clock generator was configured to long on period and short ...
260 views

### Synchronous motor base speed calculation

I would like to ask the following question. How can I calculate the base speed of a Synchronous motor for variable speed applications controlled in dq frame? I want to calculate the base speed for ...
502 views

### High current Synchronous Buck Converter, MOSFET or IGBT?

I am supposed to design a synchronous buck converter (to be driven by micro controller control signals for switching purpose). The input Voltage range is 10V-15V, and output voltage range is 4V-5V but ...
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### Synchronous Generator Resistive Load Characteristics?

I have a permanent magnet synchronous machine (PMSM) that I intend to run as a generator. I'd like to test its load characteristics under resistive load. The PMSM is Y-connected. Assuming Y-connected ...
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### Load Torque Profile of two coupled electrical machines

I am trying to learn about the torque profile of two coupled machines. I believe that if a DC motor is driving a DC generator of identical ratings, the generator will exert rated torque on the motor ...
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### It is better to have a negative clock skew?

Is it better to have a negative clock skew? Why? If we compare it with a positive clock skew, which is better?
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### Custom USB PC-PC Interface

I would like to build a software interface using the usb4java library, for sending triggers for synchronization with the following specifications: Latency below 1 ms Range: 8-bit [0, 255] + bit [0, ...
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### How does a synchronous motor know to increase current when the mechanical load is increased?

Consider a very simple singe phase synchronous motor, such as the one shown in figure 1. This motor will not be self starting, but if an AC voltage is applied and the permanent magnet is given an ...
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### how to get the angle from a 3 phases synchro signal

I'm trying to understand how to get the value of the shaft position from a synchro. I've looking in mutiple documentation but none explains how to calcuate the angle value from : I'm looking to ...
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### Synchronized digital cameras

at the moment im doing some research. I want to create an embedded "application" with two digital cameras ( > 30fps, global shutter, >= 800x600 resolution ) on an Freescale Arm iMx. 6 Quad (i think ...
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### Designing a synchronous frequency divider to 13

First post here, so sorry for mistakes or inappropriate posting. This was one of the tasks in a digital logic exam I failed today. The exact request was "Design a synchronous frequency divider to 13(...
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### Is Power consumed by a motor under various load conditions constant?

Does a motor (dc /Induction/Synchronous ) consumes more power when operating at higher load than when operating at some lower load? Or power consumption remains constant/same in both cases? What I ...
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### VHDL process causes errors

I'm new to VHDL so I just have a question to ask about why this produces an error. I have an ALU defined in VHDL: ...
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### why 'V' curve of synchronous motor doesn't touch D.C. field current axis?

Why synchronous motor armature current doesn't become zero with field excitation change ? it can be seen from 'V' curve.?
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### how to convert synchronous generator field voltage from per unit to voltge

I've been working in PSCAD and in this time I'm struggling with synchronous generator in PSCAD. As you know synchronous generator in PSCAD, working in per unite so I have to change its amount to ...
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### How to properly drive MOSFET in MPP tracking duty cycle above 50% for a synchronous buck regulator at 50-100V input?

I'm currently building a 10W high voltage (~50V-100V) Maximum Power Point Tracking (MPPT) buck regulator on the side for educational purposes. For the time being, the output is tied to a load. Things ...