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Questions tagged [motor]

An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). There are many types of electric motors. If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.

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589 views

Stepper motor substitution

I need to find a inexpensive replacement stepper motor and I am wondering if all of the specs need to be matched or are there some that don't need to be exact. Right now they are using a six wire ...
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2answers
2k views

Builiding a catapult that runs continuously with a motor

I need some ideas for designing a catapult that runs on a motor. Basic requirements: able to launch a cookie 30m, capable of continuous operation, fits within a 0.4 m × 0.6 m × 0.4 m high box, allows ...
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2answers
7k views

A proper way to determine correct voltage of unmarked components?

My kids have been tearing apart a number of different gadgets, from RC cars, to toys, to coffee makers. There are a variety of cool little motors and lights in these devices that we would like to use ...
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3answers
272 views

How to release ice cubes out of a box?

For a University project I have to build a small box containing ice cubes. The box is a shoe box, isolated with newspaper and aluminium foil, cooled by thermal packs. In this box I want to store ice ...
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3answers
523 views

Budget alternative to fancy linear slide

I have been checking out nice 1D linear slides such as this and this and this. Especially the first one is really nice since it has a built in encoder and a controller with RS232 interface. However, ...
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1answer
909 views

Does anyone know where to find the datasheet for an Electrocraft Model E19-2 motor?

More details from the motor casing: Electrocraft Model: E19-2 Serial: A01314 Part #: 0643-08-013 It looks like it was made by Robbins Myers Motor & Control Systems Division. In case anyone is ...
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2answers
1k views

DC Motor driver with Arduino

I made a simple motor driver as suggested here ...
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4answers
447 views

Suitable motor for robot

I'm planning on building my first robot using an Arduino. It's going to be a small obstacle avoiding robot powered with a 9V battery. What should the voltage of the DC motor used in the robot be? Also,...
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2answers
19k views

Motor driver using only a 2N2222 transistor?

Is it possible to build a motor driver using only a 2N2222 transistor? If yes, then how?
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2answers
4k views

What determines the speed of a homopolar motor?

What determines the speed of rotation of a homopolar motor?
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2answers
2k views

What do the numbers on motors mean (How do I read them?)

I salvaged from an old microwave, the motor that spins the food tray. I'm trying to figure out how much voltage I need to apply to it in order to get it to spin, but I cant make any sense out of the ...
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2answers
2k views

How many control pins needed for L298N H-Bridge?

I have a simple robot with two DC motors. Using the L298N Dual H-Bridge, what's the minimum number of control pins I can use to give me forward, back and turn? Here's a typical setup for the chip. It ...
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2answers
546 views

Solar powered water fountain

I am planning of building a solar water fountain which would serve as a bird bath in my backyard this summer. My requirements are simple: The fountain should be powered by solar energy, a small ...
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1answer
204 views

Remote pan a 2.7m carbon fibre camera pole

I am building a pole camera, normally you would have someone on the other end to move the pole, but we want to be able to operate it remotely. As the movement needs to be very smooth, with a soft ...
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2answers
2k views

Create a robot arm using microcontroller

I am planning to create a robot arm using the MicroController. The robot arm should move from the angle of 0 degrees to 60 degrees. I am going to use this robot arm in my application to stop and ...
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2answers
10k views

Methods of filtering noise caused by DC brush motors

I am looking for any information that would help me reduce the power rail noise and EMI of DC brush motors. I am building a robot that is powered by 2 x 250 W 24V DC motors. Thank you in advance
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2answers
413 views

Driving a small motor: What's needed?

This question is very basic, but I'd like to ask it anyway. I need to drive a small motor. I'm thinking about connecting it directly to 4 AA batteries and using a simple switch. Is there anything ...
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2answers
6k views

L298 Motor Driver spinning motor only one way :/

i just made a motor driver circuit on a veroboard to use with my arduino but the problem is l298 spinning motor only one way. here is the code it was supposed to spin motor forth and backwards every 2 ...
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1answer
1k views

3 phase ac induction motor speed control

I need to speed control small ( 0.25 HP ) 3 phase 2800 rpm motor to achieve speed in the range of 6000-7000 rpm. I know basic stuffs. ( have created soft starter etc ... which is good enough for ...
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3answers
2k views

Capacitors and motors

Every RC car I've cannibalized has had a small ceramic capacitor soldered on to the contacts of the motors. What is the purpose of having this? What happens to the performance of the motor with out ...
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1answer
559 views

How close to ground is close enough for a relay?

I'm building a simple circuit based on a relay and transistor to switch a fan for use on my boat. A digital pin from an arduino is connected to base of an NPN transistor, the emitter to ground and the ...
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3answers
4k views

how to count 2 wheel encoder signal?

I'm looking to a simple solution to keep the position of a robot. It has two DC motor and one wheel encoder for each. The encoder are incremental type. I need to be able to get the current count of ...
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4answers
14k 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 ...
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5answers
15k views

Computer controlled water valve

I'm working on a computer-controlled indoor waterfall. One of the requirements is to be able to change the water pressure via computer interface. I've googled all day long and can't seem to find a ...
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2answers
1k views

CNC Servo motor current measure

What methods and equipments can I used to measure and record the current variation of CNC servo motor while machining.
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3answers
880 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
3k views

Arduino Motor Control with L293NE

I am trying to build a simple motor controller for a 3v hobby motor ( http://www.radioshack.com/product/index.jsp?productId=2102828 ) that I picked up at Radio Shack. I am using the L293NE (...
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2answers
3k views

Can Arduino Mega handle 6 motors independently

I wonder if anyone can help me I am modifying an ROV and thinking of using Arduino Mega I am new to electronics and robotics and wonder if the Arduino Mega can control 6 DC motors independently as ...
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4answers
6k views

DC Motor control with an Arduino

This might be a simple, silly question, but I am wondering why I can't just connect a DC motor to an arduino board to have it running. One pin to the ground and the other to one of the PWM outputs. I ...
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2answers
601 views

Sourcing low torque/small stepper motors

I am looking for some small and cheap stepper motors with <10oz-in torque. Most of the steppers I can find from my regular sources/ebay are 60-1000oz-in which is far too much for my purposes (and ...
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4answers
11k views

Can you run a BLDC motor backwards without damage?

Can you run a BLDC motor backwards without damage? Is it OK to drive a model airplane BLDC engine backwards while landing, so it gets a little "reverse thrust" and come to a stop a little quicker on ...
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2answers
1k 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 ...
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4answers
3k views

Driving a DC hobby motor using an AVR and a single power supply

I've recently begun experimenting with AVRs and am keen to progress beyond making blinkies to making things move. I've tried to start with something easy, but it seems I'm already foiled! What I'd ...
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3answers
4k views

H-Bridges and Motor Stall Current

How do I determine how powerful an H-Bridge I need to control a DC-motor? In particular, does an H-Bridge need to be able to supply the full amount of current a motor will use when stalled, or would ...
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2answers
8k views

Continuous rotation 'servo' vs DC motor

Under what circumstances should I prefer a continuous rotation 'servo' to a DC motor, or vice versa? It seems to me that to use a DC motor, I'm going to need three pins from an MCU -- two for forward/...
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4answers
3k views

How does the Linistepper, open source linear Stepper Motor Drive work?

I have been trying to get the Linistepper to work, however I can't seem the understand the working of the circuit. The circuit is here. The issues that I'm unclear about are: What are the ...
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4answers
618 views

Precise motor positioning

I am trying to make a device that uses several motors all with an arrow fixed on top that has 8 fixed positions (N,NE,E,SE,S,SW,W,NW). I am trying to avoid servos and steppers because of the price, so ...
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3answers
29k views

Is it possible to drive a stepper motor greater than 1000 rpm?

How could I achieve this? What are the stepper motor facts and principless that I have to keep in mind to design a circuit to achive this goal? Are there any readymade/open source alternatives and ...
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3answers
8k views

Is there any way to determine the correct voltage for a stepper motor?

I recently bought a CNC mini-mill at an auction. It is fitted with steppers on the three axis. The X and Y are the same, and the Z is a bit smaller (physically). All the markings were removed from the ...
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2answers
2k views

Can I combine the power supply?

Here's the circuit I'm working on, it's a robotic stringed musical instrument thing, that uses 6 DC motors and an Arduino Duemilanove - The resistors are 0.25w 1KΩ The transistors are TIP122 ...
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2answers
400 views

Batteries for 12- to 24-V motors

I have some nice gear motors that run on 12 to 24 volts, and want to use them in a medium-sized mobile robot -- maybe 30 cm * 30 cm for the base. I only expect it to run indoors, or possibly outside ...
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6answers
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How do I physically work with a hobby motor?

How do I incorporate a hobby-style motor into a project, physically. How do I mount it and connect a wheel to it? (Assume that I have a working H-bridge or even switches, and am not concerned about ...
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1answer
1k views

Arduino Speed Controllers for RC Cars

This may be a lame question but, Speed controllers on big RC cars can they be controlled from Arduino? If yes, do they have a standart? do I control them using PWM values? What should i look for if I ...
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2answers
1k views

Arduino Ardumoto

I am using Arduino and Ardumoto dc motor controller to drive a DC motor. I am kind of at lost because i have gone through 10 different motors. They either don't work( not enough power ) or not ...
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2answers
531 views

Slowing down a motor - Mousebot

I put together the a Herbie the Mousebot the other day and he is FAST! Too fast to demonstrate in a small area. Have a look a this video to see just how he zips around. Documentation: Mousebot So ...
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2answers
2k views

BLDC and three phase inverter

I want to run/control a BLDC motor from a DVD/CD-rom player and found a schematic how to do this, the so called three phase inverter (see right schematic on this page: http://en.wikipedia.org/wiki/...
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6answers
28k views

Very Slow Electric Motor

A customer has asked: I want to slow down a small hobby sized DC motor to a user variable range that runs from slow to zero RPM. I would simply use a wall wart for a power supply and a ...
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5answers
501 views

Good motor supplier?

I'm looking to start a few different projects and stock up on some basic components - I was just wondering if anyone knows a good supplier of DC motors, stepper motors and servos? I'm in vicinity of ...
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5answers
1k views

Synchronise multiple Mega boards to run multiple servo motors

My friend Jules asks: The aim is to get as many servo motor controls as possible - looks like the maximum an Arduino will output is 14? Digital I/O Pins54 (of which 14 provide PWM output) I ...
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4answers
3k views

Controlling DC (Pager) Motor with Audio Signal

I'm trying to control a DC (pager) motor with a sound signal so that I can use an audio synthesizer to control the speed of the motor. I'm hoping to modulate the speed of the motor at audio rate (1-...