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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37 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 ...
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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 ...
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44 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 ...
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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 ...
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22 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 ...
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74 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 ...
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1answer
41 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 ...
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3answers
131 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 ...
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47 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, ...
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2answers
198 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 ...
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103 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"?
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385 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 ...
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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 ...
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123 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 ...
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1answer
82 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 ...
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2answers
48 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 ...
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87 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 ...
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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 ...
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52 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 ...
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2answers
169 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 ...
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1answer
64 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 ...
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1answer
44 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 ...
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3answers
328 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 ...
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2answers
113 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&...
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101 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 ...
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41 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 ...
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3answers
297 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 ...
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1answer
278 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. ...
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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 ...
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1answer
51 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 ...
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1answer
57 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 ...
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2answers
273 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, ...
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119 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 ...
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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 ...
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2answers
106 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 ...
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1answer
124 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?
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2answers
2k views

How does a hall effect wheel speed sensor work?

I have been researching how a wheel or crank speed sensor works in vehicles and am having a hard time finding a hard truth. I think I understand how it works simply. That the sensor detects a change ...
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2answers
160 views

74AS TTL to CMOS pull up resistor and maximum speed (or lowest delay)

Hello I have to pilot a CMOS input 5V chip device with a 7474 flip flop with the lowest possible delay to minimize clock jitter. Signal is about 11.3 Mhz I have two options: 1) 74HC74 (CMOS ...
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3answers
2k views

How is air conditioner room unit fan motor controlled?

I have a custom project where I need to control fan speed with Raspberry Pi according to data it gets from various sensors. At first I need to know what my motor needs. For fans I use old air ...
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1answer
120 views

Methods of measuring speed of anemometer

I enjoy DIY, but to keep things simple I purchased an anemometer cupset (3 cups). I feel that a magnetic reed switch would get "bounce" at higher speeds and I was thinking of a disk with a slot, and ...
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1answer
110 views

Simple analog circuit to simulate acceleration and braking behaviour in scale models

Background Scale-model road systems such as Faller https://www.faller.de utilise vehicles that follow a ferromagnetic wire embedded in the road surface. The vehicles operate at full speed and continue ...
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1answer
1k views

Measuring speed with Input Capture Mode [STM32 & CubeMx]

I have the L432KC Nucleo. I'm trying to measure low speeds with a 1 PPR (pulse per revolution) sensor. For low PPRs, using the Period Measurement Method is suggested. If I get the period of the signal,...
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59 views

Boosting speed of data on GPIO line between microcontrollers

I made a circuit in which the data bus P0 of an AT89S52 is connected to the P1 of an AT89C4051 and both clocks are each driven by their own 22.1184Mhz crystal. I have used a 10K standard pull-up on ...
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1answer
85 views

Sensor range and speed based on resistor

I have 4 of these sensor circuits and can't quite figure out the optimal resistor value to use. Here's what I assume (which somewhere I may be wrong): The datasheet for the IC states leakage current ...
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2answers
101 views

Linearization of motor's thrust

I'm working with a water vehicle that use four motors to move. They are placed at the corner and are fixed. Hence the movements are obtained changing the speed of each one. The vehicle can move along ...
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4answers
637 views

Exotic semiconductors for fast digital ASIC

I am researching exotic semiconductors for a digital ASIC with a few million logic gates which should run as fast as possible within a $30 million budget. (Specifically, I need to do a single fully-...
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1answer
61 views

how to minimize output resistance

I want to setting up a micro coreless motor (5*20 size) for quadcopter. I use BD139 transistor, PWM from STM32 (31kHz PWM frequency) and 500mA li-polymer battery for this work, but the maximum speed ...
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2answers
765 views

Is a 'timeout' of 0.2 ms for UART communication realistic?

In most examples (from Arduino/STM32/whatever) I see timeouts of 10 to 100 ms for different kind of communication. However, I am wondering how much 'overhead' there is. Assuming I want to send 8 ...
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1answer
50 views

Speed Controller Terminal/Connector?

I'm kind of confused on what connector (labelled B+, M and B-) this is below: (http://kellycontroller.com/kdz4840024v-48v400aseriespm-p-955.html) This is a 48V speed controller designed for up to ...
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4answers
353 views

Induction Motor Torque Slip Characteristics

This question was asked in a interview for Scientist position. For a given T-slip characteristics of an induction motor, I want the same maximum torque but at a lower slip value? Is it even possible?...

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