Questions tagged [speed]

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

Filter by
Sorted by
Tagged with
0
votes
1answer
44 views

3 Speed Window Fan Wiring

My Lasko window fan died. It is a three speed fan with both intake and exhaust controlled by a single switch mechanism. I think the problem is the capacitor. I cut it out of the circuit to tested it. ...
1
vote
1answer
53 views

using mcp3008I/P adc with raspberrypi

...
0
votes
0answers
29 views

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 (...
2
votes
4answers
643 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 ...
1
vote
1answer
95 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....
0
votes
1answer
27 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: ...
0
votes
4answers
58 views

Can I control speed of reduction motor?

I am planning to use this motor for a project but I am not sure if I can control the speed of this motor. This is 100rpm motor and I would like to use a potentiometer to control speed.
0
votes
2answers
39 views

Measuring a 2-pin active wheel speed sensor without having it connected to a vehicle

I'm trying to measure/test the square wave output of an active wheel speed sensor from a jeep wrangler for a project I'm working on. I do not have access to the actual vehicle just the sensor itself ...
0
votes
0answers
22 views

How do I achieve speed reduction in a DC series motor by adding resistance? (calculation)

So i'm hoping someone can look over my answer as i'm sceptical it's right. I used a shunt calculation for this series question as I've honestly no clue how else to do it; Calculate the size of an ...
0
votes
1answer
28 views

Accuracy in BLDC speed calculation

What is an accurate manner to calculate the rotational speed of a bldc motor using hall sensors and microcontroller units, considering both floating point operations and length of the observed period (...
0
votes
1answer
55 views

Is there an optimal configuration or any way in which I can effectively connect

I currently have a 72V e-bike. The configuration of the batteries directly from manufacturer is 6 12v 20AH valve regulated lead acid batteries connected in series. In taking the limiter harness out ...
2
votes
2answers
103 views

What's the typical distribution of fabric speed grades in produced dies?

Let's say I produce 1000 FPGAs, what percentage of these 1000 FPGAs are considered super fast, fast, medium, and slow? Does it look like a normal distribution, exponential, linear, etc.? Does anyone ...
-3
votes
1answer
34 views

servo speed control [closed]

I use towerpro sg90 servo motor for arduino I want one move forward and backward 180 degrees why does it move in one direction slower when the button is pressed ...
1
vote
1answer
24 views

Use ESD5500E with flywheel generator

I would like to use the motor speed controller ESD5500E. Manual here. The stationary engine which should be controled is equiped with a single phase flywheel generator which I have connected to a ...
0
votes
0answers
119 views

Motor 1kw 220V AC controll using BTA16-600BW

I am trying to change an analog AC speed motor control to digital control. The analog configuration has a BTA16-600BW and uses DB3 as diac. The snubber components are 1K resistor and 47 nF. I tried ...
0
votes
2answers
51 views

Can this analog speed regulation for a DC motor be used for this scenario?

I’m dealing with a part of a small project where a device’s(DUT in the diagram) rotor is rotated at a desired fixed/constant rotational speed for a while and slows down itself by disengaging the ...
0
votes
1answer
67 views

calculate rpm motor to drum roll rpm [closed]

I have a machine used the motor to drive a press roll(a small roller) that sends power to drum roll (big roller). I need speed 27 rpm for Drum roll and how many RPM for the motor that drives the ...
2
votes
0answers
220 views

How to subtract gravity from raw acceleration of an MPU9250 - 9DOF IMU

I'm working with an MPU9250 and using the Madgwick Filter. For what I know I need to subtract the GRAVITY from my X, Y, Z Acceleration values, basically, some kind of gravity compensation to get ...
0
votes
1answer
23 views

What affects the current ratings on constant torque pole changing motors?

Two different motors, one is rated 1.49A on slow speed configuration and 1.43A on high speed. The other motor is rated 6.09A on slow speed and 6.99A on high speed. These are constant torque pole ...
0
votes
1answer
119 views

AC Induction Motor Constant Speed Control without Tachometer

I want to run the AC induction Motor at a constant speed with LOAD also without Load. So I am controlling motor speed by TRIAC. I can control the motor speed, but my problem is:- I don't have a ...
-1
votes
1answer
42 views

minimizing waiting time for 8051 port state

I made myself a project with standard 8051 microcontrollers (AT89S52 and AT89C4051) and will be making more with the same due to price and availability. When data is being sent from one GPIO pin from ...
0
votes
3answers
511 views

Controlling the speed of a single speed AC exhaust fan motor

I have this single speed exhaust fan: 30" Exhaust Fan with Shutter - Direct Drive - 1/4 HP - Single Speed. When it's running it's way faster and louder than I'd like it to be. So I'm trying figure ...
0
votes
3answers
63 views

PSC motor speed affected by capacitor?

I replaced the induction motor in my furnace (PSC type), and it was suggested that I replace the run capacitor at the same time. (They are both 20 years old). The new motor is a Fasco A136, ...
3
votes
2answers
205 views

Propagation 'speed' of EM waves in air versus through conductive material

This paper I was reading said: "At a high level, the propagation speed of EM waves through conductive materials is SLOWER than their speed in air". Don't conductive materials intrinsically have less ...
1
vote
3answers
104 views

Is the electric current delayed

simulate this circuit – Schematic created using CircuitLab -Suppose that the distance between "D1" and "D2" is too large. -Does "D2" give a delayed response compared to "D1"?
0
votes
2answers
766 views

Why does the Dual Speed Dahlander motor need a bridge in the fast speed configuration?

On the nameplate of the motor is a Delta/Wye-Wye configuration, meaning you supply the ones (U1, V1, W1) and leave the twos open to achieve the slow speed. And for fast speed you supply the twos and ...
0
votes
0answers
31 views

High-torque low-speed switched reluctance motor: design Features

I am studying the design of high-torque and low-speed switched reluctance motors (SRM). There are classic designs (8/6, 10 / 8,12 / 8) and designs with multi-toothed rotors and with additional teeth ...
0
votes
2answers
622 views

What happens to the torque/speed curve of a brushless motor when I increase the voltage?

Here is a an image of the torque/speed curve. My guess is that increasing voltage will simply translate the curve up because the slope is the torque constant, which is a physical motor property that ...
1
vote
1answer
97 views

How fast is L1 cache of ARM Cortex-A9 in Xilinx Zynq-7000 FPGA?

I consider writing a small program for the ARM Cortex-A9 in the Xilinx Zynq-7000 FPGA, so the program will be small enough to fit into the 32 KB L1 instruction cache. The data will also be less than ...
0
votes
2answers
53 views

How to reduce the speed of this motor?

I have an old Siemens motor with this specification : 220V 80W 0.65A I need to reduce the speed (slow down) of this motor. I know it's easy with something like an inverter, but I'm just wondering ...
0
votes
1answer
232 views

Electrical equivalence and Difference between Flux and Torque in AC motors

For AC motors, Synchronous and Asynchronous ones, are these two linked together or different quantities, namely magnetic flux and torque? Also if I want to measure these quantities electrically then ...
3
votes
0answers
49 views

DC Motor control PWM [duplicate]

I need to vary the speed of a DC geared motor using software (Raspberry Pi SW GPIO). The motor is 3 V DC geared micro motor @150 rpm. At 3 V full 'speed' the motor is very powerful for ...
0
votes
1answer
59 views

torque-speed characteristics of induction motors

I have come across a website which says that zero staor resistance makes the maximum torque constant for different frequencies while keeping v/f ratio constant. And a non-zero stator resistance affect ...
2
votes
2answers
292 views

Controlling speed of PSC induction motor (Questions about operating at high slip)

Induction motors typically run synchronous speed since most motor types (CS/CSCR/Permanent Split Phase) have high low-end torques. A PSC motor on the other hand doesn't have much low-end torque. FAN ...
-2
votes
1answer
66 views

How does a DC brushless drill-driver work? [closed]

My new cordless, brushless drill has good torque, but it won't turn below about 50 rpm. My older brush-type drill, same model, will drive screws even at near-zero speed. Does the brushless circuit ...
0
votes
1answer
56 views

Shunt DC motor controller improvement

A 1.4 A shunt DC motor, with brushes, in a home made pottery wheel from 1970s runs slightly erratically. In general I am well impressed with it as the motor choice is appropriate for the application, ...
0
votes
3answers
565 views

Speed Current Relationship in İnduction Motors

It is said that speed of an induction motor depends on its frequency and torque depends on current. But I will explain what i cant understand here. Let’s think an induction motor runs with constant ...
0
votes
2answers
192 views

BLDC Motor max load

Hi i have a BLDC moter https://www.banggood.com/350W-48V-DC-Brushless-Motor-Geared-Ebike-Tricycle-Kit-Engine-Electric-Scooter-p-1419702.html?akmClientCountry=NL&rmmds=cart_middle_products&...
1
vote
0answers
136 views

ZCD with PIC 18LF45K40

I want to implement phase angle control for a single phase ac fan. To achieve that we need a ZCD circuit interfaced with a microcontroller to get a pulse at zero crossing. As our circuit has some ...
0
votes
0answers
49 views

How to read Torque-Power diagram for an asynchronous motor

I'm sorry if my question is too stupid, but I am not able to correctly understand how to compare the information showed by the torque-power diagram with the motor test data for a 2000W Asynchronous ...
1
vote
3answers
382 views

why speed is not directly proportional to torque in dc machine?

I have a conceptual doubt about torque-speed relation in a DC motors. It's probably a gap in my thinking but I'm posting this question anyway. As per me "in case of dc machine we see that the armature ...
1
vote
1answer
435 views

Fan speed control with resistor

Electrician from Australia here. Just having an issue with a heater fan in a bathroom for a client. According to the diagram I have posted, I can wire a second fan up to this and it should all work. ...
22
votes
3answers
6k views

Why does RAM (any type) access time decrease so slowly?

This article shows that DDR4 SDRAM has approximately 8x more bandwidth DDR1 SDRAM. But the time from setting the column address to when the data is available has only decreased by 10% (13.5ns). A ...
0
votes
1answer
63 views

Sensorless speed control and startup of BLDC

Regarding the sensorless speed control of a BLDC, I have some doubt about what may happen in two scenarios when the rotor's position is unknown: 1) the start-up from zero and 2) with an initial ...
0
votes
1answer
58 views

DC Series Motor Starting Direction

I have a 12V DC Series Motor - a car starting motor - for an experimental aircraft to pre-spin helecopter-type blades before takeoff. Usually, it works correctly but occasionally with power on, no ...
0
votes
2answers
298 views

PC fan speed control

I am making a stir plate out of an old PC fan, variable resistor, and DC power supply from this tutorial. I have two power supply's to choose from, their outputs are: PS1 = 12Vdc, 2A PS2 = 12Vdc, ...
1
vote
4answers
126 views

Can I calculate how much time it will take for an electrical signal to propagate through a TTL circuit?

Given a particular circuit of TTL, can I calculate how much time it will take for an electrical signal to propagate through some section, or all of, the circuit? If I wanted to know how long it ...
0
votes
4answers
95 views

Could we theoretically massively increase number of parallel computations (for some problems) by getting rid of cpu clocking?

CPU clocking involves making sure that each operation or part of an operation takes exactly a certain amount of time (the machine cycle time). One way to increase the efficiency of a cpu is by ...
2
votes
2answers
125 views

How does transistor bandwidth affect stability?

I was watching a video where Dave Jones of EEVBlog interviews Rod Elliot of Elliot Sound Products. Rod was discussing that he tends not to use digital chips in his designs because the chip will become ...
2
votes
1answer
141 views

BLDC motor poles versus Torque and RPM

How to calculate the cost of a BLDC motor? Assume I need 24 stator coils of height 10 mm and width 5 mm. Is there any formula for torque comparison with increasing the number of poles?

1
2 3 4 5