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1answer
34 views

PWM input voltage regulation

I have a 12V DC motor that I plan to run in one direction with PWM input at 21A. However, in the other direction I want to drop the voltage to limit the speed. Ideally. the regulator would sit between ...
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1answer
47 views

Is it possible to use 2 relays instead of a DC motor controller?

I have been for motor controllers to control two 12V motors that have a stall current of 130A and at max power (expected operation) will draw 68A. I am having trouble finding low cost motor ...
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1answer
131 views

Radio Control DC Motor With Potentiometer

I am looking to control a 12V 16A 180RPM DC motor. The package I am purchasing includes this motor, and a speed controller. Please see this link for the exact detils. The speed controller comes with ...
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1answer
449 views

Control of 4 pin cpu fan with 3 pin socket and …?

I have a problem with controlling my cpu fan speed since it has a 4 pin connector and the socket on my motherboard is broken (transistor connected to it has burnt). I have it connect at the moment ...
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3answers
2k views

How do ceiling fan controllers work?

There are some devices that look like ordinary light dimmers, but are sold expressly for ceiling fan speed control. For example: Lutron Diva Quiet 3-speed control. Unlike an ordinary dimmer, this has ...
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2answers
141 views

Doubt in PMDC motor pulsed switching current

I am controlling a dc motor by switching through the MOSFET. I am able to run the DC MOTOR and I have measured the current through scope by putting a RESISTOR SERIES of the DC MOTOR. My doubt is, ...
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1answer
142 views

How to calculate switching frequecncy [duplicate]

I am trying to control a brushed DC motor with PWM control through a MOSFET, below is the basic circuit for an idea. The PWM signal is given from a microcontroller to the gate driver IC which drives ...
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0answers
448 views

What's the theory behind speed control of a multi-tap multi-pole induction motor?

Ceiling fans are an application of multiple-pole capacitor-run/permanent split capacitor induction motors, and they appear to control the speed through a partially powering and shunting multiple-tap ...
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0answers
142 views

SCR regulator as motor speed control

I've got a PMDC motor and have been toying with PWM. Have had little success with my own circuits, still haven't given up hope though. Motor ratings below: Motor Specs: Permanent Magnet DC ...
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1answer
2k views

Need help with 90vdc PM motor speed control circuit

I recently found a Permanent Magnet 90vdc motor, 2.5hp, 18Amps. It has simply two wires for voltage (red/black) and two for thermal breaker circuit i believe (blue/blue). It came out of an old ...
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3answers
3k views

How to decrease the motor Speed without losing the maximum Torque

I am using MDS40A motor driver(http://www.cytron.com.my/viewProduct.php?pcode=MDS40A&name=SmartDrive40) to drive a power window motor (12V, brushed motor) similar to the one at ...
2
votes
1answer
676 views

TRIAC switching problem

I have a speed control circuit for a 230V AC motor. It has a BTA16 TRIAC for phase control and it is driven by an optocoupler MOC3021. The trigger signal is coming from a PIC16F676 microcontroller. ...
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3answers
1k views

AC motor Low RPM problem

I'm working on a controller for ac induction motor and it's spec is given below. I could control the speed without any trouble at higher speeds like 2000 rpm and above. I'm using TRIAC phase angle ...
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1answer
291 views

Driving a brushless DC motor (with a UC3625?)

I am trying to drive a brushless DC motor with hall effect sensors using a microcontroller and a TI UC3625 controller. Thing is, I haven't had much luck. Its a beast of a chip and I've tried wiring ...
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2answers
336 views

Dead time effects Of IGBTs

I'm working on a project to control single phase ac induction motor in which I planned to use two IGBTs, one for switching the PWM to the motor (for AC chopping, PWM frequency is fixed @16khz) and one ...
1
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1answer
498 views

Need help on speed control of single phase ac induction motor

I'm working on a project "single phase ac induction motor speed controller". The spec of the motor that im going to use is 230v,1/8hp ,8000rpm@no load I want to know whether it is possible to ...
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votes
2answers
859 views

Help with 555PWM motor control

I'm making a laser spirograph for a school project. It requires speed control of three motors. I used a simple 555 astable circuit with a pot for control, then the output goes into the base of a power ...
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votes
3answers
829 views

Multiple motor speed control with a single triac

I have a requirement where I have to control the speed of 10 motors. The motors are 230V AC single phase motors. The speed of the motors need to be increased or decreased using a electronic controller ...
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2answers
220 views

Simplest way to control the speed of 4 identical fans

Hi, my computer has 4 fans in it running on 12v from the PSU. How can I control their speed? Maybe a potentiometer?
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1answer
284 views

Controlling a Motor for test bench

This is my 1st question here and I'm stumped... I spent all my EE classes on programming and ICs. When it comes to AC and motors, I feel worse than ignorant and spent all day trying to research where ...
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2answers
3k views

Control speed of Nidec fan?

First of all, sorry for my lack of knowledge in the subject. I have a Nidec TA450DC B35502-35 fan which I've installed in a large wooden cabinet where my computer and other electronics sit. This ...
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0answers
261 views

Replacing a 12V fan blower switch with a relay

I've got a fan blower switch in a 12V application that I want to augment with some sort of relay setup to remove the load from the switch. The switch is old (but functional) and replacements are ...
1
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1answer
955 views

What electric motor spec clues indicate easy speed control options?

I'm investigating HVAC fans etc to design my own system and controls, and having fully variable speed control is an important consideration to me. I'm pretty sure there are types of AC motors that ...
1
vote
1answer
885 views

Use a PWM or other controller for 24V/500W application

I've been gaining understanding about using PWM for a motor speed controller. I'm developing a project (go kart) that uses a 24V DC starter motor and I want to build a motor speed controller that is ...
1
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1answer
231 views

Half bridge motor driver

I have some doubts about this circuit: http://hackaday.com/2011/10/28/motor-drivers-half-h-bridge-with-brake-and-more/ Is this schematic correct?
3
votes
1answer
4k views

What power motor should be used to power a Segway-like device

I am planning on building a personal transportation device which will either be a skateboard with a motor etc or a Segway-like device. I will have two wheels and must be capable of getting me to move ...
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5answers
4k views

How do you minimize stepper motor vibration?

I'd like to run a stepper motor at a very smooth, constant speed, with minimal vibrations to both the mount holding it and its output. How do I drive the stepper motor so that speed remains constant, ...
0
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1answer
267 views

Electronics - ISO 42v DC Brushless Fan to 110AC with Speed Knob MOD HELP

I'm looking to Mod a 42V DC brushless fan to work on an 110-AC outlet and incorporate a speed knob into the build. This is the info that I have: Fan was originally pulled from a Cisco 7600 Series ...
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votes
3answers
5k views

3-phase Motor Speed Controller

Background If you look at my profile description, you'll see that I'm involved in building and wiring up Carnival floats that are powered by an 800KVA, 415v, 3 phase Generator. Electrically, they ...
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4answers
4k views

Controlling water pump speed

How can you control the speed of an AC water pump? In particular this one. My guess is that PWM won't work on an AC motor? I've heard that controlling the voltage will change it's speed...is this ...
2
votes
3answers
507 views

PWM above 16v for speed control? Will it work?

I have recently ordered 1 x VNH3SP30 Motor Driver Carrier MD01B I was just reading the charts and found below saying about the pwm, VNH3SP30 and VNH2SP30 Comparison: VNH3SP30 VNH2SP30 ...
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2answers
476 views

DC Gear motor Operation

I just bought a DC gear motor- I'm trying to spin a 20 pound disk. I realize I need to hook it up to a power source, but I'm having trouble figuring out the proper source. PS I also got a DC speed ...