An electrical actuator converting electrical energy into rotational motion.

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19 views

Infer the EMF amplitude of a generator from limited motor-mode data

Context: I am designing a very low speed alternator for small power devices, and I would like to select the correct motor for my application. The problem is, the cheap ones provide very little data - ...
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2answers
107 views

How do transistors work in a circuit? [duplicate]

I'm currently just getting involved with electronics, just bought an Arduino starter kit and am fiddling around with it. Currently i'm on a project which involves the use of a DC(spinning) motor in ...
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2answers
49 views

Considerations for a motor resisting a human grip

I'm trying to replicate this project at home, wherein strings attached to fingers and pulled by servos are used (instead of difficult pneumatics) to simulate an object in a glove as a version of ...
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2answers
438 views

How to move an object through 30 degree rotation? [closed]

I want to make an electronic bird feeder in which the feeder floor tips 30 degree down to exhaust the used seeds. I know how to work with PIC micro controllers to do the timing and enabling an output, ...
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2answers
71 views

Transistor Arduino Loss of Voltage

simulate this circuit – Schematic created using CircuitLab I have a wire connected to the base of the transistor that goes to the PWM pin 9 on the Arduino Uno. On the collector of the ...
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1answer
41 views

Motor rated 7.6AMPS. How will motor behave if driven with PWM controller with 4A output?

Firstly, I apologies for having to ask such a basic question. I'm looking to buy a controller for a permanent magnet motor. The specs of the motor are: 200VDC, 1.5HP, 5700RPM, 7.6A, form factor: 1.0 ...
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2answers
231 views

DC Motor as DC Generator + Output Polarity Switcher

I am working on a hobby circuit. And got a quick question. I am using regular mini DC Motor as DC Generator. If the motor is rotated one side it generates few volts. If the motor is rotated in ...
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3answers
155 views

How to make two motors spin at the same speed?

I am currently using two identical motors to drive a robot. The motors are both controlled using relays but one of the motors is spinning faster than the other. How can I slow down the faster motor ...
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1answer
96 views

Understanding current readings from a multimeter

If you couldn't guess, I'm new to electronics. So, I've just received my 3V air pump, it didn't come with any specs, so I'm trying to figure everything out. I hooked it up to a DC variable power ...
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1answer
164 views

48V PWM Motor Controller

I considering doing an electric Go-Kart project with two direct drive rear 48v motors (considering two of these). I plan to control it using Arduino PWM pins. However, I am not sure of the route to go ...
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1answer
113 views

Drive a DC motor rated for higher than 5V

How would I go about if wanted to drive a 10V DC motor with 5V logic, suuch as the one found by an Arduino, at different rotation speeds? Is there such thing as a motor driver that accepts an ...
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1answer
124 views

XY table using motorized potentiometers

I'm trying to implement a XY table using 4 units of these motorized potentiometer, controlled by an Arduino. Since I have other uses in mind, I'd like to use as few pins as possible, wich would imply ...
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1answer
82 views

Multiplexing 4 DC motors with arduino

I'm aiming to control 4 motorized faders with an Arduino. However, I'm still trying to figure out how to best multiplex all the inputs/outputs. Each fader has two potentionmeters and one touch ...
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3answers
196 views

RPM counter using 8051 microcontroller

I am building a RPM measurement unit using 8051 micro controller. I want to measure RPM of AC motor. I have connected proximity sensor to get the pulse for each turn. I have connected the proximity ...
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2answers
149 views

How can the Arduino Uno support up to 12 servos if it only has 6 digital PWM pins?

According to this: The Servo library supports up to 12 motors on most Arduino boards and 48 on the Arduino Mega. On boards other than the Mega, use of the library disables analogWrite() (PWM) ...
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2answers
258 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 ...
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1answer
44 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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3answers
125 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 ...
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3answers
154 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 ...
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2answers
94 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 ...
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1answer
47 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 ...
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1answer
58 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?
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1answer
92 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 ...
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1answer
68 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 ...
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2answers
96 views

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

I have a dc motor with the following specifications: ...
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3answers
212 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 ...
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1answer
59 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 ...
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2answers
81 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 ...
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2answers
108 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 ...
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1answer
156 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
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2answers
116 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
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1answer
198 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 ...
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1answer
130 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 ...
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1answer
59 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
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1answer
136 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
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1answer
113 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 ...
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1answer
70 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 ...
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2answers
95 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?
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1answer
128 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 ...
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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
69 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
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1answer
60 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
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1answer
83 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 ...
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1answer
58 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 ...
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0answers
206 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
129 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 ...
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0answers
420 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 ...
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2answers
101 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
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2answers
315 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
1k 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. ...