An electrical actuator converting electrical energy into rotational motion.

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4
votes
2answers
319 views

Does a multi-speed fan operate at a different wattage at different speeds? [closed]

This question has been phrased to be a non-use, theoretical question on electrical design, as it has always been intended. Note to moderators: please be careful editing or re-phrasing to reduce the ...
1
vote
1answer
48 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 ...
0
votes
3answers
143 views

Motor PWM Controllers Too Good to be True

I am working on a project which involves driving 2 high power 60amp stall 12v motors from an arduino. I had been browsing available drivers, and everything on the market seems to be quite expensive ...
0
votes
3answers
182 views

Is It Safe To Apply 24V Across a 12V Motor?

I am trying to determine if it is safe to apply 24V across a 12V rated motor. I am working on a robot that weighs approximately 150lb and has a friction intensive drive system. I believe the motors ...
1
vote
2answers
110 views

Stepper motor stalls at low frequencies. Why?

I picked up a Howard Industries 1-19-4200 (5 wire) stepper and have been driving it on my testbench with a PIC18F2550 and L293D. I recently added a potentiometer to an analog pin of the PIC for speed ...
-1
votes
1answer
64 views

Sharing the Seeeduino LiPo with a motor controller

I'd like to use a Seeeduino to control a small DC motor to wind/unwind a thin cable which will be lifting a small door. Ideally, I'd like to use the same LiPo that's being used to power the ...
0
votes
1answer
73 views

What is the torque of motor when dead weight added to the shaft? [closed]

How to calculate the torque of motor when external dead weight (say 70Kg) is hanged over motor shaft? How to find the starting of motor?
0
votes
1answer
123 views

Surge Protection for pump relay

I have a 24 volt relay that starts a 220 volt pump motor for a sprinkler system. The relay and pump are about 800 yards from the 24 volt signal generator. I have had four relays go bad and fail. I ...
0
votes
1answer
86 views

DC 5 Volts - 2100mAh Electric Motor Generator. How?

I have spent my entire weekend trying to locate a place where I can buy a 5 Volts - 2100mAh Electric Motor/Generator. My goal is to spin this motor up to a certain RPM to generate the 5 volts and ...
2
votes
2answers
100 views

Using a motor as a generator: How fast does it need to rotate?

I have a dc motor with the following specifications: ...
2
votes
3answers
231 views

Four-contact push-button switch; what's the pictured switch called?

I have single phase submersible pump, around 400 foot underground in a Bore-well and its controlled by the controller shown below. The green button is a push-button switch which if pushed and held ...
0
votes
1answer
64 views

Why does my PWM Arduino loop not working as intended?

I have a Arduino sketch I am trying to use to control a DC motor using PWM. It seems it it just running the motor as if I the PWM was set to 255 (100%). I intend for my sketch to start the motor ...
1
vote
2answers
94 views

How does a CD-ROM rotor know when to stop the moving plate?

I need to make a mechanism with a RaspberryPi like in CD-ROMs, so I can easily move a plate from the minimum position (CD-Rom closed) to maximum (CD-ROM open). I have a DC motor (from CD-ROM) and I ...
0
votes
2answers
120 views

Can the output of two 15-amp motor drivers be hooked up in series to achieve a 30-amp tolerance?

I had a cheap 15-amp motor driver that I bought on eBay. You can see product details here. I was planning to use this motor driver to power my robot, which uses two 24v wheelchair motors. Then I ...
0
votes
1answer
171 views

L298N damaged? What to do?

I'm trying to control a DC motor with the L298N motor driver and it worked for a brief moment. I've used the setup mentioned in this video tutorial, but someone in the comments said that with this ...
0
votes
2answers
151 views

How do amps affect RPMs?

I bought a replacement pellet stove auger motor rated at: 120V, 0.51 amp, 1 RPM. (ASIN: B0032D26I6). I installed it into the stove and it works, but the feed rate ...
0
votes
1answer
242 views

How can I limit the current in a 12v car battery to be safe for my 25a motor driver?

I have a 25amp Sabertooth Motor controller that can be powered by my 12v car battery. I have big 24v wheelchair motors attached to the motor controller. I do not know how much current that the motors ...
0
votes
1answer
147 views

Will motors cause more noise when connected to a ground plane instead of directly to batteries?

I am making a small robot using an Arduino and two servo motors. There are two ways that I can provide power to the motors: 1) Run power and GND wires from the battery holder to the motors, then ...
1
vote
1answer
66 views

Stepper motor drive supply voltage

I am going to use the SM42HT47-1684A stepper motor, its datasheet is following: http://p.globalsources.com/IMAGES/PDT/SPEC/001/K1052328001.pdf In the datasheet the rated voltage of the motor is 2.8 ...
0
votes
1answer
167 views

Four different pwm using PIC 18f45k80

In a 4 phase dc motor control application, I have to excite the coil using Mosfet with the pwm of 12.5 Hz with the train of pulses of 12 khz on each phase. So I am in a position to create 4 different ...
0
votes
2answers
134 views

Motor/driver for smoothest and most constant speed

Which type of motor/controller can maintain the smoothest and most constant speed in the range 300 - 1000 rpm with minimal vibration? ie: low cogging torque, etc. I have an application in mind which ...
1
vote
1answer
77 views

Differential Drive for Heavy Robot

I'm asking here another question in relation to my previous one. I would like to know how would one proceed when you want to control a heavy robot with differential wheel drive. When it comes to ...
0
votes
2answers
129 views

What will happen if we excite a Synchronous Machine with AC?

Normally we excite Synchronous Machines with DC. But what would happen if we provide AC in place of DC in field winding of Synchronous Machine? Will Synchronous Motor start in with AC excitation?
0
votes
1answer
131 views

How to short a dc Motor with arduino?

Thanks for the reply JYelton, Below is the requested diagram of my circuit. simulate this circuit – Schematic created using CircuitLab How to short a DC motor? I was trying to short ...
16
votes
3answers
2k views

Why don't all motors burn up instantly?

A motor rated for 3S (11.1 V) has an internal resistance of 0.12 ohm. The maximum current is 22 A. 11.1 V / 0.12 ohm = 92.5 A Doesn't this mean ...
2
votes
1answer
83 views

Does L293D consume power when not in use

I am designing a robot using the L293D motor driver, and I have just successfully hooked it up to my micro controller. I am using two batteries, one two control the motor and one to control the pic ...
0
votes
1answer
61 views

Determine power needs of a motor

I recently stripped a motor out of an old 2887-z gaf dual-8 mm projector. I'm not even sure if the motor AC or DC, although I suspect its a brush less ac motor. Unfortunately, I disposed of the ...
2
votes
1answer
87 views

Laser controller project

The context is that I want to build a tunnel laser effect, that modulates the angle of the cone according to a sine wave. The purpose being, to create a cool Borg weapon effect for a Star Trek Borg ...
1
vote
1answer
64 views

Do servo motor specifications take into account the gear ratio inside?

I know this question may not belong here but I assume this is most likely where the most well informed people can help me. I am looking at buying a servo motor for a an application that must be able ...
0
votes
0answers
264 views

Control 12v motor with 5v PWM

I have 5v PWM (555 generated) and I want to control speed of a motor using it. The problem is my motor is 12v and by diving it with a 5v PWM I can't reach full speed of a 12v motor. my pwm generator ...
2
votes
1answer
176 views

Power supply problem with L293D

Recently I was trying to drive two motors with atmega328 and L293D motor driver IC. The power supply section is shown below I used a 12V battery with high current driving capability.The motor was ...
1
vote
0answers
747 views

How to tell whether a motor is an AC or DC motor?

I watched a youtube video http://www.youtube.com/watch?v=hT3jJRGVdW4 The man says : by spinning the motor to see whether the output is AC or DC, then it can tell whether the motor is generating AC or ...
1
vote
2answers
102 views

H-Bridge ic not working as expected

Hi I am using the SN754410 h-bridge driver to try to control a motor using two switches. As I understand the SN754410 should be identical to the L293D. I have hooked up a circuit and I think I have ...
2
votes
2answers
405 views

How many servos can I run on an ATtiny85?

This is my first time asking a question on this website, so please correct me if I'm doing something wrong... I have been working on a small project which runs three Servo motors on an ATtiny85, ...
4
votes
2answers
3k views

What is the purpose of the Motor Run Capacitor?

Looking at a control box for a marine Air Conditioner and it has a HUGE capacitor in it. The schematics label it a "Motor Run Capacitor", but I always thought it was just used to start the motor. ...
-1
votes
2answers
51 views

Change the motor or the gears?

I wonder, what's better to achieve some given torque? To chose a motor with the Kt that gives that torque or to choose a reduction drive that will output that torque from a given motor? I wonder ...
1
vote
0answers
110 views

Use a 2N7000 in place of 2N2222A

Here's a description of both circuits. A ring shaped magnet is mounted on a brass axle and a set of bearings. Coil A and Coil B are wound on the same core. The magnet is placed about 1/8 of an ...
2
votes
1answer
192 views

H-Bridge freewheeling current

I'm building an H-Bridge to drive some motors I have around. I'd like to have a bridge that can be powered by different power sources, for example batteries or atx power supplies interchangeably. ...
1
vote
1answer
142 views

(Arduino UNO) Random Button inputs due to change in code

(First of all: Sorry for the Title.. I really don't know how to describe my problem in one Sentence) I'm an arduino beginner. I build a two button control for an electronic motor. simulate ...
1
vote
0answers
203 views

Old variable speed AC motor wiring

As a disclaimer, I have a little electronics knowledge, but I'm no expert. I've been given an old 1940's Hunter fan and I'm working on fixing it up. I took the base apart and wiring is pretty bad - ...
0
votes
0answers
108 views

Need Help in creating a driver for a 220v AC Servo Motor

I am a new to electronics and have been working on to design a Motor Drive for comonly available Serveo motors like: http://www.alibaba.com/product-gs/1580332915/servo_motor_used_in_CNC_machine.html ...
0
votes
1answer
60 views

Serial port controlling a motor bridge--unknown bug

This is part of a project where I wanted to bypass using a microcontroller and control motors directly with my laptop. I'm using a usb-to-serial cable and use the serial RTS and DTR to control a ...
0
votes
2answers
221 views

What voltage of Li-ion battery to run 24 volt motor (6 cell or 7 cell)

I have the option of replacing my aging and almost dead lead acid batteries with Li-ion to run a 24 volt motor. The data sheet for the Li-ion cells report the cells as having a nominal voltage of 3.8 ...
0
votes
1answer
149 views

L293DNE Always On

I am hoping to put together a circuit that will control a slot car track from a 30V 3A power supply. I have used the L293DNE as I thought it would cope with the extra load. The circuit is based on ...
1
vote
1answer
879 views

How to wire external power supply on stepper motor

I followed this tutorial to setup my stepper motor. Now my stepper needs 12V and not 5V. So I was wondering how I can add an external power supply without destroying my pi. I found this: But it ...
0
votes
1answer
57 views

What are the effects of the different design parameters when building a linear motor?

I am trying to build a so-called "ironless" linear motor. Conceptually, they are quite simple. Linear motors, generally speaking, are just like rotary motors but "unrolled." As I understand it, the ...
-2
votes
1answer
261 views

difference between a DC motor and gear motor [closed]

Isnt DC motor the same as gear motor? Because what is the use of dc motor without gears?
-1
votes
1answer
70 views

is it possible to use a circuit to reliably measure when a motor has 'stalled' [closed]

ive been fixing my electric garage door opener and it got me thinkin... the motor turns a geared chain that moves the door up and down. there is a small mechanical device attached to the mechanism ...
0
votes
0answers
53 views

Where can I find synchronous machine parameters to use in a PSCAD simulation?

I am trying to observe a loss of field on synchronous motors of different types and sizes. PSCAD seems to want a DQ equivalent circuit. I've Googled the problem and tried several manufacturers' ...
0
votes
1answer
138 views

What kind of motor would I need to turn this central heating valve?

I often forget to turn my central heating down when I leave the house, so I thought it would be cool to make a device that could do it for me and to have a website where I can check and change the ...