Questions tagged [speed]

Speed is a scalar quantity referring to the rate at which an object changes position (but is not position-sensitive).

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Maximum speed Nema-34 stepper motor can handle

I've got used 34HS8801 NEMA34 stepper motor which I am experimenting with. Unfortunately, dtasheet doesn't provide driving voltage, nor does it provide maximum RPMs. Now, I would like to see how fast ...
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What is happening when a motor is set to a "high" speed?

When looking at different electrical devices like a blender, vacuum cleaner, fan, or drill, it's common for these devices to have different speed settings like "low" or "high" or ...
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Can you control BLDC motor speed with PWM?

I wanted to control the speed of a very fast and noisy brushless dc cooling fan. The fan I have is a 3 pin 12v 6.3w 120mm fan by Delta Electronics. From what I've learned from the internet is that the ...
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STM32F334 Nucleo-64 ADC speed

I have a problem with my ADC speed. I'd like to have a speed over 1 MSPS but I get only 60 KSPS. I use a very basic code that uses ADC interrupt to stock the value into a table and when the full data ...
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Quick state feedback controller question

If two estimators where used in a state feedback system, one with error dynamics poles at -10 and -9 and another one at -80 and -90. Which system will give you a better overall performance?
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How to judge my achievable design frequency on FPGA?

I am coding a design from scratch in VHDL. The FPGA target is a Cyclone V. My design resource occupancy is around 30 % of Logic. I able to reach a frequency of around 80 MHz. The worst paths are ...
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Measure ball speed with sensor inside

I came across a product which is a ball with a small Bluetooth sensor placed inside. This sensor, coupled with an app, can measure ball speed, height and length of throw. I wonder how this is possible,...
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How are real-time speed and torque of a brushless DC motor computed?

Let's suppose I need to work with a three-phase brushless DC motor. The DC motor has only three wires to control its 3 phases, there is no other wires (no Hall effect sensor return for example). ...
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Exciting the rotor and stator of a slip ring induction motor at different frequencies, will it develope torque?

I came across this question as I was preparing for an exam, I am unable to understand the theory behind it. The textbook says the motor can run a 600 and 2400 rpm but gives no explanation. Could ...
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What is the effect on speed and power when we connect three motors on a single shaft? [closed]

Rolls Royce used three 750R (YASA) motors in their aircraft "Ionbird." All motors are mounted on the same propeller shaft. What is the effect on the overall speed and power of the motors? ...
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High frequency BLDC control for parallel speed and position control. Looking for thoughts

I was not able to find a similar topic but am kind of stuck with my problem. What am I doing? I am trying to control the speed of a BLDC Motor very precisely but have to control the position of the ...
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DC motor coupled to a DC generator

Consider a separately excited DC motor which is coupled to a shunt dc generator (under no load condition) and acts as a prime mover. If we set the speed of the DC motor to some certain value (for ...
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Replacing a 3-phase speed-varying drum switch with a VFD?

I am working on a stock feeder / power feeder (used with woodworking equipment). It has an 8-position drum switch to control both fwd/reverse direction as well as vary the speed. The ON positions of ...
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Controlling the speed of a single phase 4-pole induction motor

I have a Crompton Greaves single phase induction motor that powers my drill press (image below). I believe it’s rated at 1/2HP. I wanted to control the speed of this motor so that I can use the drill ...
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Speed of compound wound dc motor

This is homework. Given a 500W, 200V compound wound motor with constant shunt field and a series field that varies with armature current, how do we calculate the change in motor speed. I know the ...
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Engineering basic question: speed of a device designed in FPGA [closed]

I am studying FPGA by myself, sorry if it is a stupid question for you. I am going to design a block in FPGA ( vivado/vhdl). This block will transmit data. I need to reach for this block, for example ...
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Tachometer frequency problem

I have an NPN tachometer sensor. I want to measure the rotation speed of a three phase motor, but the output frequency of the tachometer changes. For example, if the actual value of the motor ...
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Throttling of Electronic Speed Controller with 6S lipo

Thanks for having look at this. I had an turnigy 150A ESC and 2000KV bldc motor. I calibrated ESC and it happened perfectly. I connected 3S lipo to ESC and increased the throttle from 1100uS to 2000uS....
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Single phase motor does not stop

I have a circuit that controls sine phase motor with three triacs. When I turn it on it works properly, I can regulate the speed, but when I turn it off the motor does not stop, it still spins but not ...
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Display the speed of a Dc motor [closed]

I have an industrial rotating machine (huge dimensions) working with a DC motor, there is a button that changes its speed but the value of this speed is not displayed. is there a circuit that measures ...
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Can I lower speed on 1/4 HP PSC fan motor by lowering the input voltage without harming motor?

I have pics of the motor label. This motor now has three speed settings: low, medium and high. I have pictures of the control as well.
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Not sure about the way to compute the voltage across a DC motor driven by a NPN BJT

Long story short, I wanted to make my own H-bridge but I was out of p-channel MOSFETS so I tried to design one with BJTs instead, but before doing just that I simply wanted to try to run an average 3-...
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How to get fine DC brush motor speed regulation?

I want to get a fine speed regulation of Pittman DC 24 V brushed motor with 10,000 RPM for a hobby project. The voltage I will use is battery 12 V DC, so does that mean the speed will be 5,000 RPM? I ...
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Why the speed and current will decrease when I change the connection delta to star on ac motor?but reduce motor voltage will have opposite result?

On the 3phase motor, The motor has been accelerated to a stable operating speed, then I reduce the line voltage -> speed decrease -> slip increase -> current increase -> the power will ...
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5 answers
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Alternating current frequency

An introductory discussion of alternating current in a primer I was taking left me thinking. We don't see a light bulb flicker because the alternating happens at 50-60 Hz. If it takes 1.28 seconds for ...
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Expected SDRAM access speeds?

I would like to get an idea of how fast SDRAM accesses should be. If I have a 32-bit ARM based processor running at 500MHz accessing an SDR sdram device clocked at 166MHz, what sort of read/write ...
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1 answer
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What is the value of this resistor?

I am trying to fix a rotary tool's AC powered DC motor controller, there is a resistor that has been burned out, I want to replace it for a new one, my question is how do I find the value of the ...
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Are we controlling the speed or torque when we press the accelerator pedal in an electric car?

In this video, at 16:23, the presenter says that when we press the accelerator pedal in an electric car, we are "commanding torque and not speed". I'm confused here, aren't we making the car ...
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Can I reduce this AC motor speed?

I spent yesterday opening this fan unit and researching... I'm looking to reduce the speed by about 25-40%, at the lowest speed setting only. Please have a look at the photo and let me know what ...
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What type of oscilloscope can be used to troubleshoot 100BASE-T1 automotive ethernet?

I would like to implement the 100Mbps single pair automotive ethernet specified in 802.3bw, otherwise known as 100BASE-T1. I was told that in order to troubleshoot and test on this standard, the ...
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Momentary button for voltage boost circuit design

I am just starting to dabble in electrical engineering and circuit design, so forgive my ignorant questions. I am trying to get started building a very simple experiment with my son and I'm not sure ...
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Single phase capacitor start induction motor TRIAC speed control and centrifugal switch replacement

I have a machine tool with a 1 HP reversible motor. I am looking at implementing speed control by using a zero crossing detector and phase angle controlling circuit. I am planning on using a micro ...
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0 answers
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Convert Hair Dryer to Variable Speed

I am using a hair dryer to increase oxygen/air levels in a torch assembly for a forge for metal work. I need to be able to increase/decrease the fan motor speed smoothly and more precisely than the ...
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Altering PWM on four pin fans using only transistors

I have some high RPM 4 pin Tacho PWM fans, they run at 6000RPM and 56.5 DB at 100% duty cycle the noise is enough to drive you insane - there are seven of them total running off of a SAS backplane, ...
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Magnetic pickup speed sensor

I am looking at a magnetic pickup sensor datasheet. This graph shows the output voltage against the surface speed. However, there are 3 curves, that changes the output voltage range changes. What ...
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Controlled solenoid stroke length

Let me create a scenario to better illustrate the problem I have 1500 pens that I want to individually actuate upwards with 3 different distances, ex: 10mm/15mm/20mm I thought I could use a solenoid ...
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1 answer
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Sharp transistor cut off outside active region

I'm building a simple temperature controlled NMOS switch for regulating the speed of a fan. It's a 12V fan and the controller works great (as long as the transistor is in it's active region.) This is ...
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3 votes
0 answers
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Motor speed controller generating noise on DC source

I am working with a speed controller for a 3-phase brushless DC motor. That motor is taking a 6-12S li-ion battery as input. I have additional electronics that is connected to the same power source ...
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How fast is DC current/voltage?

The standard way to calculate the speed of information (current/voltage, EM wave) through a dielectric medium (like PTFE or fiber) is to determine the relative dielectric constant, and compute the ...
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Slowing Down a AC Centrifugal Fan

I'm working with this blower, https://www.mouser.com/ProductDetail/ebm-papst/D2E097-BE11-77?qs=DB9cKZ5ZWfV%252B%252BcGyCSU1bQ%3D%3D. Is there an simple way of slowing down the speed without any ...
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What exactly does Close Loop Speed Control System control?

I'm working on a project about controlling Brush-less DC Motor using PI(Proportional Integral) Close Loop Speed Control Method. 3 Phases Motor is driven by 6 MOSFETs, Rotor speed is sensed and ...
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GaAs p-type vs Si n-type Mosfet frequency

Witch of the above can be perform at highest frequency. Lets assume the 2 devices has the same size and voltage rating. I assume that the speed is a function of electrons mobility on the n-type and ...
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DC motor speed reduction

I have a 4 pole DC mobility scooter motor but no controller. I want to use it to run a small mechanical hacksaw. The motor on a 12 volt battery is powerful enough but is too fast. I have seen plenty ...
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3 votes
1 answer
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i2c bus speed issues

i'm using a MSP430F6736A the eUSCI_B0 i2c peripheral on my chip in INTERRUPT mode to communicate with a FRAM chip. I'm trying to figure out why i have to drop my i2c clock to 130KHz in order to ...
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STM32F405RGT6 for AD7768 ADC fast enough?

I want to operate 2 simultaneous channels of an AD7768 A/D converter @ 256 kS/s. Its resolution is 24 bit which yields a data rate of 2 x 24 bit x 256 kS/s = 12.288 Mbit/s. Using a microcontroller, I ...
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using mcp3008I/P adc with raspberrypi

...
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How to increase polling speed of data from external ADC (controller and ADC has SPI interface) without any external interrupt?

I have an an external ADC which has capability to sample data at 40Ksps and controller needs to poll the data from ADC. I am unable to get enough sampling rate by keepon calling it from while(1) loop (...
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3 votes
4 answers
941 views

Electrical Motors and Frequency

I was musing about electric motors after seeing one randomly on TV, and there's something I'm must be remembering incorrectly. It's just a thought experiment, so I'm imagining some theoretical DC ...
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1 vote
1 answer
463 views

4-20 mA output from Arduino for VFD

I'm a beginner with electronics, so everything has to be explained in simple terms to me. I have an Arduino with a program which provides a value via the Analog output, so that is anything from 0-5 V....
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1 vote
2 answers
362 views

How to run a PWM controlled fan at 100% all of the time

I've salvaged a Nidec G14T12BS2AF-56J14 fan from a broken Playstation 3 which I would like to use to make a dust blower for PCs. As a test, I've connected the fan as follows: Brown: 12VDC Black: ...
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