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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 ...
1
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1answer
54 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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2answers
20 views

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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1answer
33 views

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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1answer
49 views

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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1answer
45 views

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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0answers
28 views

Digilent EPP handshaking problem

I intend to use my Spartan-6 board as an interface between my mic (which produces I2S data) and PC for live recording. Since UART is too slow, i planned on using Digilent's parallel interface with ...
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2answers
59 views

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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0answers
57 views

PM Synchronous motor Id-Iq current control

I am trying to implement the current control (Id, Iq) of a four pole PM synchronous motor. I am having trouble in making the Iq current follow a set reference. I had also implemented a cascaded ...
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1answer
48 views

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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1answer
62 views

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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0answers
60 views

PM synchronous motor parameter measurement

I am trying to find the parameters of a surface mounted PM synchronous motor using the application note AN4680 (PMSM Electrical Parameters Measurement) and had some queries regarding it. The Ld ...
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0answers
49 views

Design a synchronous sequential circuit where if input is 0 output is 0,1 or 2 and if input is 1, output will hold 3

I am having a problem working on this homework assignment. I have drawn the state diagram and the state tables. I am using two D flip flops assigned as Q0 and Q1. Q0 gives me the first digit of the ...
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3answers
139 views

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 ...
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4answers
401 views

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 ...
0
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1answer
75 views

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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0answers
71 views

Why synchronous motor not synchronize while accelerating?

I have 4.2 Mw,11KV,500 rpm sychronous motor which is used for pumping operation.its acceleration(95%speed)time is 14s & Valve opening is 10%.when i have started the machine at 11.6Kv supply ...
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1answer
100 views

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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0answers
61 views

in wireless communication why the nodes need to be synchronized

A lot of times I see the authors talk about synchronization. I have seen that "the nodes should be synchronized" so why? I mean we can set all of their timers at the same time? what do happen that ...
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0answers
24 views

how to drive field winding with Buck_Boost?

In the picture that is shown as a Figure 1 obviously there is a resistor functioning as a load, and it's current(Io) as a feedback to the semiconductor (IGBT) in order for it to switch the mentioned ...
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0answers
43 views

buck boost and exciting synchronous generator

I have a Buck Boost converter for exciting a synchronous generator. the thing is that there is a load in the buck boost converter as shown in Figure 1 , everything is working good. what i want to do ...
0
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1answer
61 views

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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1answer
123 views

Maximum Power Point Tracking Duty Cycle for a Buck Regulator

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. ...
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0answers
61 views

Permanent Magnet Synchronous Motor Direct & Quadrature Inductance

I've modeled the following motor (http://www.evo-electric.com/inc/files/AFM-140-Spec-Sheet-V1.1.pdf) assuming a direct & quadrature inductance of 0.2mH. However, I think I may have mistaken this ...
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1answer
773 views

Genlock two OV5642 camera modules on Arduino with ArduCam

I need to shoot stereo video or stills at about 10 FPS possibly in perfect sync. My plan is to set up a 3D stereo rig (2 standalone units - each consisting of Arduino UNO + ArduCam shield + OV5642 ...
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0answers
100 views

Triple Axis Accelerometer Breakout - ADXL335 synchronise

I have three ADXL335 Triple Axis Accelerometer Breakout boards. I wish to measure the the acceleration of a human leg as it walks at three points (hip knee and ankle). I want this to log this data in ...
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3answers
67 views

Anyone have specific examples of how IEEE 1588 is most commonly used in industry?

I've run into the concept of IEEE 1588 synchronization over Ethernet several times, and am curious what its most common uses are and the details of why it is required. For example, I read that cell ...
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3answers
121 views

Regarding a statement given in my 'Electrical Machines' textbook about synchronous machines?

I was reading the introductory chapter of my textbook on machines and when the author comes to a little introduction on synchronous machines, I was stuck on a statement midway. It goes: "When ...
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2answers
86 views

Analyzing clock oscillator using timing diagram

In a recent examination a friend of mine was asked to analyze and find the frequency of oscillation of a clock oscillator using timing diagram as shown below: Can someone give me directions as how ...
2
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3answers
469 views

Meaning of “with respect to rotor and stator”

In the following example, when it says “with respect to stator” and “with respect to rotor”, did they mean the rotor part of the synchronous generator in both cases? Example: The excitation field in ...
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2answers
202 views

Clock Deskewing and flip flops

I have a question in my text book that I do not quite understand. I was wondering if someone could please explain what the question means? Such as, what is a deskewed flip flop. How would one find the ...
3
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2answers
296 views

synchronous buck ls-FET switching losses and dead time minimization

I'm designing a Synchronous buck converter. I'm having doubts regarding the following: In the rectifying period of the converter, using a Schottky diode in parallel with the low side MOSFET will ...
1
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1answer
131 views

Choosing Altera Quartus II clock rate for stopper

I'm using Altera Quartus II to built a stopper. I'm using 2 counters and I need to choose the right clock rate to get pulse every 1 sec. There are only two options in Quartus for the clock: 27Mhz and ...
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3answers
762 views

How to perform a synchronous output on the Arduino?

I have a device I'm trying to control with the Arduino. It works like this. Arduino sets and holds 'ready line' to 5V high. Device sees ready line high and sends 16 clock pulses for two bytes of ...
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2answers
156 views

How is a synchronous 214 rpm motor for a 50 Hz mains possible?

According to Wikipedia at steady state, [...] the rotation period is exactly equal to an integral number of AC cycles. Now I have a brief description of a three-phase motor designed for 50 Hz AC mains ...
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1answer
269 views

Sequential Circuit Diagram: D Flip-Flop

Sequential Circuit Diagram: D Flip-Flop Answer Key ...
4
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1answer
241 views

Can a synchronous regulator “chirp” in burst mode?

I'm looking at (the millions of) buck regulators available for a project where the board will be a host board for a Gumstix Dual Cortex A9. This can pull quite a bit of current at maximum so I was ...
28
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4answers
3k views

How to synchronize two microcontrollers to micro-second accuracy?

I need to synchronize two micro-controllers so that they can measure the speed of propagating waves. The time delay measurements need have microsecond accuracy (error less that 1/2 of a microsecond). ...
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2answers
88 views

How electronic components keep synchronized?

So, voltage travels super fast right? Still, there has to be some lag between voltage traveling from one transistor into another. How is a circuit kept synchronized then?
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2answers
168 views

Why do displays with auto-synchronization function get out of sync? (pixels blur) [closed]

I'd like to know why LCD displays that have the "Auto" button need it in the first place. Are they losing sync with the signal because of some special feature or all LCD displays really suffer from ...
4
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3answers
721 views

Clock skew? Good or bad?

So, I've been reading up on clock skew. I came across the fact that clock skew can be incredibly useful, in the sense that positive skew can be used to speed up the circuit by increasing the clock's ...
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2answers
2k views

Design a 4-bit synchronous counter using D filp-flops and 16 x 4 ROM that can generated any arbitrary counting sequence

What are the restrictions on the counting sequence? Give the ROM contents for the following sequences: a) 12, 13, 14, 15, 5, 6, 7, 0, 1, 2, 3, 4, 11, 10, 9, 8, 12, 13, etc... b)8, 9, 0, 1, 8, 9, ...
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1answer
211 views

Regulating a small clockwork synchronous AC motor

Is it possible to drive a small synchronous motor with permanent magnetized rotor to other speeds it is designed for? I tried to drive a small clockwork AC motor which is symmetrically build but ...
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3answers
491 views

Sync video with data

When I have a datalogger and I want to sync a video-file to the recording, what would be an easy method? The logger and the camera both have an internal clock, but they may not be set exactly to the ...
4
votes
1answer
417 views

Synchronous motor mystery

Not too long ago I acquired an old ('70/'80) German flip clock. I found out that this clock is driven by a one-phase synchronous engine. I can't get the motor to run. I (carefully!) connected the ...
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2answers
3k views

Syncing Signals with Global Clocks in FPGAs/CPLDs and Edge Detection

I am a newbie in digital logic design and I'm trying to get my head around syncing external signals to the global clock in an FPGA. For example, the SCK signal/clock fed to an FPGA by the SPI Master. ...
2
votes
1answer
850 views

How to implement a synchronization signal with AVR (attiny45)?

In pseudocode I want to do following: ...
4
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3answers
720 views

Timing inside a shift register

How I imagine synchronous digital networks work: data lines are sampled at rising clock edge, a set of transients occur, system settles, and data lines are sampled again on next rising edge. I would ...
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1answer
3k views

Ripple counters versus synchronous--pros, cons, and power consumption

Substantial edit--note that David Kessner's answer was written in response to the original posting; view the edit history to see what he was responding to From what I've read of digital design, there ...