Questions tagged [motor]

Without qualification 'motor' is usually taken to mean a rotary electromechanical motor, typically either a brushed or brushless design.

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2
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1answer
118 views

funny behaviour or what - dc motor control

I'm trying to control the speed of this motor, with this motor driver and pic16f690. pwm in my program 5 kHz frequency (0.2 ms period) Starting with 50% duty ...
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1answer
1k views

Controlling a conveyor belt with a time based motor

I have some crude time based motors taken from a robot arm that we upgraded to proper servos. I want to be able to power a conveyor belt with one of them and I was wondering how I would go about the ...
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2answers
187 views

Motor driver selection

I am building a 2 wheel robot to carry 7KG of load. I used this link to get the torque required for each motor which is 11Kg-cm. So I choose 2 of these motor which has 36Kg-cm(2x more) torque. I ...
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2answers
383 views

Choosing motor and battery for a robot

I have a project which requires a robot to move around a room with a flat surface (concrete floor). The robot must carry a laptop. I estimated that the total weight would be 6-7kg (including motors, ...
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4answers
1k views

How to raise/drop a spider?

For Halloween, I'd like to build a spider that drops from the ceiling when it detects motion and then rewinds itself back up to scare the next kids. I already have a lightweight foamish spider from ...
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2answers
2k views

H-bridges and stall current

For a DC motor with a stall current of 950 mA, what should the H-bridge's current rating be? What will happen if we use our H-bridge L293D whose max. output current is 600 mA?
14
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6answers
45k views

How to convert vertical motion to horizontal?

I am interested in using this miniature motor Squiggle Micro Motor to create very tiny horizontal movements. However, due to very limited space, I can only place it vertically within my project. ...
5
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2answers
1k views

Building a non rotating persistence of vision device

I'm looking for a way to create a non-rotating persistence of vision device. I have all the electronics set up but I'm stumped with the mechanical design. I tried these two designs: But these didn't ...
7
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3answers
943 views

Reducing motor speed without jamming up

So I built three little bots so far. One with a raspberry-pi, (6V motors), one with an arduino (12V motors), and another with an arduino but a hacked remote car (7ish, volt motors): The problem I ...
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1answer
374 views

automatic sorting with barcode identification inside a refrigerator [closed]

I'm endeavoring to prototype a challenging sorting mechanism inside a fridge and would appreciate any constructive tips on how to get from the specs to a plausible design. Problem The aim of the ...
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2answers
2k views

Does more "Power" (W) means better motor?

If a motor has more Power (W) from another it means that it is better?
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1answer
893 views

Is this a good quadcopter build? [closed]

3D CAD: After some editing: I'm building the frame myself from aluminum and polycarbonate. EDIT: all frame is polycarbonate except of the arms (and all screws & nuts & washers)), they are ...
7
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1answer
1k views

Upgrading the motors on a SeaPerch ROV - more torque, or more RPMs?

I am looking to upgrade the motors for SeaPerch underwater ROVs so we can carry heavier payloads and more equipment. My question is, should I look for motors which have a higher RPM and lower ...
3
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1answer
255 views

How do I interpret these specs for a motor and motor driver?

I ran into confusion while reading about motors. Consider a motor with these specs: Maximum motor voltage - 6VDC No load current - 250mA max. Stall current - around 1A I am considering using the ...
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2answers
230 views

Additional Power to DC Motor via Second Power Source

How can I provide more power to a DC motor that is in series behind a receiver circuit hacked out of a cheap RC car without burning up the receiver board? The board runs off two AAs at about 3V. I'm ...
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2answers
226 views

How can a load be balanced between multiple AC electric drive motors?

I have a three wheeled vehicle in a tricycle configuration attached to a fixed frame. Each wheel is powered by an AC electric motor. The AC motors are fed by motor controllers that take a speed demand....
4
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1answer
815 views

How do I adjust objects on a conveyor belt into the proper orientation?

This is part two of my larger robot, it follows up what happens with the small rocks here: What kind of sensor do i need for knowing that something is placed at a position? Now i am taking the rocks ...
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4answers
427 views

What kind of sensor do I need for knowing that something is placed at a position?

I have a small device that's picking up small rocks from a pile and moving them to another place. Its a kind of crude way of trying to push the whole pile onto a bigger gear and hoping one of them is ...
2
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1answer
364 views

How do I interface a TLC5947 with small motors?

This is a follow-up to this question: Prototyping a device with 25-100 small DC 3.0V motors, is Arduino a good fit? I've decided based on the answer that sending the control signals through multiple ...
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2answers
96 views

Why is this electro motor going slower?

From an old dust buster I've got this electro motor, the included battery pack and the charger: I ripped everything apart (the dust buster was broken) and the motor still works. After playing around ...
8
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1answer
2k views

Increasing the rotation range of a servo motor

How do I increase the rotation range of a standard servo? Most servos have a rotation range of ~ 180 degrees. I would like to access the entire 360 degree range on the servo, partially because I would ...
3
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3answers
5k views

Is there a way to use a single dc motor output for two different loads?

Is there a way to use a single dc motor output for two different loads (by using gears, relays etc) ? Please see the illustration below: To clarify the illustration, I get the dc motor power at "...
3
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2answers
330 views

Prototyping a device with 25-100 small DC 3.0V motors, is Arduino a good fit?

I want to prototype a therapeutic device that will have a lot of tiny mobile-phone type vibration motors like this one in it, and I want to be able to activate them in any configuration I want. I'm ...
2
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1answer
245 views

Perfecting Tripod Gait - Building a R-Hex Robot

I need help with figuring out the following things: I'm developing a hexapod R-Hex type model with a tripod gait. However, the angles obtained during the robot's walking in real life are not ...
5
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2answers
756 views

What is the opposite of 'Antagonistic'?

A robotic joint is connected to two actuators, e.g. air muscles. One flexes the joint, while the other extends it. This arrangement is called 'antagonistic'. But what if I had an electric motor ...
16
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4answers
7k views

Will connecting two servo motors double the torque?

For my robot, I am using two continuous rotation servos to spin a threaded rod. I am trying to make this project as cheap as possible. Here are the servos that I can find: Servo #1: This is a very ...
9
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2answers
855 views

Are power and torque required related in some way?

I am designing a new platform for outdoor robotics and I need to calculate the power and/or torque that is needed to move the platform. I have calculated that I need about 720 W of total power to move ...
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5answers
9k views

High voltage motor control with arduino

I'm trying to control a higher voltage motor than an arduino can source with a pin, with an arduino. I am trying to hook it up to a transistor. The battery pack is not supposed to be 4.8V, it's 6V, 4 ...
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5answers
543 views

Arduino Motor control

I'm working on a rather low budget project, and need some way to control four or more motors using one Arduino. I've looked at motor shields a little, but I have a shield on top of it already, It does ...
8
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5answers
4k views

Building a controllable "knob"

I am trying to build a semi-analog timer. Something like those old egg timers that you rotate the face of. I want a knob that I can turn that can be read by a microcontroller, and I also want the ...
8
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1answer
302 views

How can I upgrade an existing robot with a higher torque, sensored motor @ ~100 watts?

I would like a high torque motor (37 oz-in @ 5760 rpm) for souping up a Scorbot 3 I bought. I really need it to have an encoder to count the number of revolutions and to allow high start-up torque. So ...
7
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2answers
2k views

Why does our LM2576 circuit suddenly cut down the power?

I have an LM2576 circuit plus an adjuster to adjust the output voltage, for controlling motor speed in a line follower robot. The circuit works great when adjusted to give out low voltages, but when I ...
14
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1answer
1k views

Will turning an NXT motor by hand damage it?

I have heard a lot of claims that manually turning an NXT motor by hand can potentially damage it. I was wondering whether this was at least partially true, and whether there is any evidence to ...
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2answers
4k views

Programming an ESC to have reverse mode

How do you program an ESC to have a reverse mode? We're looking to control an ESC from a servo board (for a robotics project). Assuming that the input will be between 0 and 255, we're looking for 127 ...
39
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4answers
109k views

What is stall current and free current of motors?

What are the stall and free currents of an electric motor? For example, this Vex motor lists its stall and free currents at the bottom of the page. I think I understand the general idea, but a ...
12
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1answer
1k views

How to get two continuous tracks (tank treads) to move at the same rate?

I've got a couple Vex 269 Motors hooked up to an Arduino Duemilanove. These motors run a some Vex Tank Treads. The two motors are run as servos on the Arduino using the Servo Library. The problem I'm ...
2
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1answer
291 views

Compatible ESC's with brushless 3 phase motors

Am trying to find the right ESC for the following two motors http://www.e-fliterc.com/Products/Default.aspx?ProdID=EFLM30180MDFA#quickFeatures http://www.e-fliterc.com/Products/Default.aspx?ProdID=...
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2answers
4k views

Choosing motors for 2 wheel drive robot

I am making a 2 wheel drive robot. Suppose I know that my robot is going to weight x kg when finished and I know the diameter of the wheels y (geared motors will be connected directly to the wheels). ...
57
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2answers
106k views

Why are capacitors added to motors (in parallel); what is their purpose?

I've seen many motors having capacitors attached in parallel in bots. Apparently, this is for the "safety" of the motor. As I understand it, all these will do is smoothen any fluctuations--and I doubt ...
38
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11answers
52k views

Preventing leaks in motor shafts for underwater bots

Whenever building an aquatic bot, we always have to take care to prevent leakages, for obvious reasons. Now, holes for wires can be made watertight easily--but what about motors? We can easily seal ...
11
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2answers
12k views

How do I calculate the required loop frequency for a servo controller?

I have a motor which drives a string connected to a load cell. I would like to implement a closed loop controller to control the load applied by the motor to the string. How do I go about determining ...
12
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3answers
942 views

What determines the amount of noise an actuator produces?

Many robots and other mechanical devices produce the signature whirring noise as they move, some produce less. What makes the difference? What restrictions a silence requirement places on a robot?
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2answers
363 views

How can I detect if a DC motor on a robot is starting to fail?

What characteristics can I look for which could be reliable early warning signs that a DC motor on my robot, say one used for the drive, could be failing? I'm looking for an answer that deals in terms ...

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