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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33
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6answers
159k views

What is a “digital” motor?

Dyson keeps going on about their new "digital" motor. What is a digital motor? How can a motor be digital, if it is inherently analog? Is it just marketing doublespeak?
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2answers
2k views

Need oscillating servo/stepper motor guidance

EDIT: Additional Information below original post... Looking for a 360 degree servo motor that has adjustable control for timing of steps (or at the least timing per full oscillation) and can support (...
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3answers
2k views

Best way to drive a 20 kg object on a turntable? [closed]

I need to rotate an object about 20 kg's in weight, 360 degrees. I'm thinking of using a stepper motor with some kind of rubber wheel pushing along the rim of a lazy-susan. Geared or belt solutions ...
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2answers
2k views

Powering a Servo: Do I need a separate power source?

I have a project that utilizes two strong digital, coreless servo motors. Whenever I use DC motors, I usually need to have separate power sources for both the microcontroller and the motors (due to ...
4
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3answers
1k views

A “hobby” grade linear motor

Can anyone recommend a hobbist linear motor? The motors are often described as being a rolled out version of a DC motor (is that true btw). If this is the case then how does one "drive" a linear ...
2
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2answers
1k views

AVR Assembly with Servo/Motors/Etc

So I've been learning AVR assembly in my own time, I rather like it and I understand registers/counters and such. But the problem is...most of the websites I read online/tutorials don't really talk ...
4
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2answers
7k views

Two Wire Servo in RC Car?

I took apart an RC car recently and found 2 sets of motors. The rear wheels (left) seem to run off an electric DC motor which is understandable. The front wheels (right) I expected to be controlled ...
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2answers
3k views

Controlling a geared motor

I've used small high speed dc motors by just wiring them to a battery and potentiometer, but i've heard a lot of talk in these forums about motor controllers and h-bridges, and I don't fully ...
4
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2answers
2k views

DC motor Armature and Field back emf

In a motor where both the field and armature are wound there are at least two possible control scenarios. The field winding can be excited with constant current and the armature voltage controlled, ...
2
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2answers
2k views

Low voltage motor with arduino

Would it be safe to use a 1.5 volt motor with the adafruit motor shield? It is rated for 4.5 to 36 volt motors so I am unsure what will happen. Also, what would be a good way to determine the voltage ...
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2answers
1k views

predicting brushless motor rotation direction?

When connecting a brushless motor to an ESC, we are taught to apply power and switch two of the wires if the blade is spinning in the wrong direction. Is it possible to predict the blade rotation by ...
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3answers
11k 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 ...
4
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1answer
829 views

Detect PWM Duty Cycle in Hardware

How would I go about detecting at motor controller level, that my PWM signal coming from my microcontroller is at 50% duty cycle. I would like to design a dead band into my motor controller so that I ...
5
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1answer
1k views

AC/DC motor stall protection after the fact

I am wondering if there is a circuit I can add to a low voltage DC motor or a 110VAC motor that will cut the power if the motor stalls. I service coin op redemption games and on a few games these ...
5
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3answers
602 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 ...
4
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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 ...
6
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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 ...
2
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3answers
529 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
927 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
448 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,...
6
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2answers
20k 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
5k 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 ...
5
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2answers
550 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 ...
2
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1answer
207 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 ...
4
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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 ...
9
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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
416 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 ...
3
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1answer
2k 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 ...
11
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3answers
3k 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 ...
2
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1answer
567 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 ...
2
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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 ...
3
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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 ...
8
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5answers
16k 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 ...
2
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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.
2
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3answers
899 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
4k 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 (...
8
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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 ...
9
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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 ...
3
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2answers
606 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 ...
5
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4answers
12k 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 ...
5
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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 ...
5
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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 ...
11
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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/...
5
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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 ...