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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1answer
156 views

TWIP robot - DC gearmotor speed/Encoders

I'm working on a self-balancing TWIP (Two-Wheel Inverted-Pendulum) robot project which will be using two brushed DC gearmotors with encoders. As there were no speed constraints for the robot (and ...
5
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1answer
387 views

Handling PID DC motor control at low speeds

I am building a 4 wheel rover and am using PID DC motor control for the back set of wheels. The feedback for the speed is provided by Hall effect sensors, with two pulses per rotation. This means ...
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1answer
133 views

Linear actuator for impact tests [closed]

I'm puzzling over the remake of an impact testing machine. It's a sort of a robot arm that pushes a probe against a target to test its characteristics. Right now the machine use air pistons, because ...
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1answer
144 views

Determining rated speed (RPM) required for a DC gearmotor

I'd like a two-wheeled robot to travel at 1m/s, given a wheel radius of 0.03m. I've calculated the rated speed required by the gearmotor as 318.28RPM: $v = \omega r$, $\displaystyle{\frac{v}{r} = \...
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0answers
113 views

Design of an equatorial mount [closed]

I am considering designing an equatorial mount for astrophotography. I have been researching on the best way to do that and I am thinking on using a stepper motor with a gearbox. The thing is that it ...
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1answer
476 views

DC gearmotor stall current and battery capacity

I'm working on a self-balancing robot project and am in the process of motor sizing. I've read that with self-balancing robots the motors need to switch direction quickly, which can cause them to ...
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0answers
37 views

Help finding a linear actuator [closed]

I need help finding a linear actuator. I only need it to move 15 mm but it also needs to move extremely fast. Preferably 1 inch per second. It needs to be capable of holding a 10 lb weight. The ...
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0answers
27 views

Issues with the dual VNH2SP30 motor carrier and 131:1 metal gearmotor 37Dx73L mm w/ 64 cpr encoders

For a while now I have been trying to build my own robotic platform, kind of like a turtlebot. However, I have kept running into an issue with controlling the motors. My main controller for sensor ...
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1answer
118 views

DC motor pid control [closed]

Would a 12V geared DC motor (about 140rpm) (with an encoder) PID controlled as a servo give a study response when subjected to a load?
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1answer
470 views

What is the typical weight distribution for a brushless motor?

Brushless motors, like regular motors, have different parts (commutator, stater, etc). What do these various parts weigh?
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2answers
805 views

What is the function of inductors in series between the terminals and the brushes of a DC motor?

I'm repairing (hopefully) a 12 V DC motor (Johnson Electric HC971(2)LG-101). The motor has a coil in the motor cap between each terminal and the corresponding brush - two coils (inductors) one on each ...
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1answer
40 views

Motor Controller Power Supply

I have an Orange Pi which I would like to use as the computer for a robotic project. It supplies around 15 mAh power directly from the board, barely enough for a single LED so I will have to use ...
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1answer
64 views

I need help figuring out what motor is used in this design

I am learning how to make rigs for high speed motion control. Basically, whatever action needs to be executed must be done by a rig that is triggered at an exact moment. In this particular case, I ...
1
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1answer
408 views

Telescoping linear actuator [closed]

I need to find a linear actuator that can extend to multiple times it's length. I am going to be fixing the actuator horizontally and it will carry a light vertical load. So far I have thought of ...
1
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1answer
743 views

Starting and stopping a heavy rotating disc

I am currently working at a project involving a heavy disc rotating around its center. The disc weights around 2 kg and has a radius of 0,25 m. At every angle π/6, there exists smaller ...
2
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0answers
42 views

How to choose a motor for water surface vehicle? [closed]

I am about to build a water surface vehicle (a kind of boat). I was looking for different type motors and ruled out the stepper and servo motors. But I got confused between brushed and brushless dc ...
0
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2answers
642 views

Motor for DIY Electric skateboard

I've been planning to make an electric skateboard for a while now. All the tutorials that I have seen use brushless motors. However, where I live, its not possible to get the exact ones as shown in ...
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1answer
52 views

Will this have more or less lifting strength

Bit of an engineering question. If a snake robot is 100 cm long, and every 10 cm is another motor. Would the robot lift more weight, the longer/more motors attached to it.. or is lifting ability ...
0
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1answer
68 views

Can you detect if encoder wire is connected on a motor?

I am writing some logic for a PID controlled catapult (In order to improve precision). That is all fine and well. However, if, for some reason, the encoder wire disconnects, the motor spins ...
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2answers
2k views

DC motor - max current

I'm looking at the data sheet for a DC motor that states: Current consumption at nominal torque (mA): 380 I have a power supply that can deliver 500 mA. Can I ...
3
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3answers
787 views

Mobile robot speed synchronization for straight line moving

I would like to build a simple mobile robot with differential wheels, and I am currently design the wheel speed controller. After reading some papers, I noticed that to realize a straight line moving, ...
0
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1answer
190 views

How to control 6v micro solenoid from arduino

I want to control this solenoid from Arduino, but I am confused which transistors, resistors and diodes to choose. I have seen a lot of tutorials about controlling solenoid from Arduino, but all of ...
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2answers
912 views

difference between sabertooth motor controller and rc esc?

i am building a rc/robot mower. most of the youtube videos show the sabertooth motor controllers being used to connect the rc receiver to the dc motors. But here in Australia, the sabertooth i need ...
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3answers
4k views

Supplying power from a power bank to an arduino and DC Motors

I have a two port powerbank capable of supplying a maximum of 5V 2.1A I'm using it to power an Arduino and a L293D IC connected to two DC motors which have the following specifications: Working ...
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1answer
35 views

5kHz arm control, grasp end effector

I was having a chat with a robotic expert recently. The guy told me that for an arm with motor drives running at 5kHz your are to set the control so that someone can grasp the end effector and move it ...
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0answers
84 views

Single Board Computer/Microcontroller Recommendations for controlling large DC motors? [closed]

Hey looking for recommendations. Right now I am using a sabertooth 2x25 motor controller for my drive train, receiving signals from a raspberry pi. From what I am seeing online - there is a lot of ...
5
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1answer
301 views

Why to combine a Raspberry Pi (or similar board computer) and an Arduino for controlling motors?

I am planning to build a omnidirectional holonomic robot, and checking what I should use for the hardware, I saw many people using a Raspberry to compute most stuff, which in turn calls an Arduino to ...
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1answer
769 views

Which motors are used in boston spot robot

I want to know which motors or smart servos are used in boston dynamics spot robot. Where can i read its spicification and is it possible to buy the motor?
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2answers
616 views

Robot clutch to disengage wheels

I have a robot that moves around autonomously. Very often I want to push the robot several feet to start a test over again, or sometimes I want to wheel the robot outside to my car or to a nearby ...
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3answers
2k views

What exactly does a motor driver do? Why do we need an additional power supply for motors?

What exactly does a motor driver do? Why do we need an additional power supply for motors? I'm a hobbyist and making a line follower from scratch.
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3answers
6k views

How to reduce the DC motor starting current?

I am making a bot with 4 motors with a stall current rating of 11.7A. I was using 4 separate motor controllers which has a peak current rating of 20A to control each motor. But when I gave power to ...
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1answer
56 views

Granite Devices Ioni Pro. PWM set point mode

Inspecting the PWM set point mode it seems HSIN2 is the PWM input, and HSIN1 is the PWM direction input. Is it possible to reverse this, so that it's more consistent with step and direction mode ...
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2answers
1k views

Line follower robot with 2 or 4 motors?

I am developing a line follower robot and I am not sure about how many motors should I use: two or four. I'm thinking of using four, but I do not know if it's worth it (it will let the car be heavier, ...
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1answer
1k views

How to calculate what wind speed is required to lift 1kg? [closed]

as the title says, i want to calculate how much km/h is required to lift 1kg of weight. Please explain this to me as simple as you can since i'm really noob in this. Thanks.
1
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1answer
41 views

Proper cable to connect 12 V, DC 6 Ah batteries to Sabertooth Motor Controller for Lawnbot?

I am building a (fork of) the Lawnbot-400 robot found on Instructables.com and in the book Arduino Robotics. The author, while brilliant, tends to gloss over and omit details, one of those being how ...
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2answers
119 views

Permanent Magnet DC Motor Calcuations

I have to determine speed and torque suitable for my combat robot. I've done some calculations and I need to know whether they're right or not (because they don't seem to be right). Suppose I have ...
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2answers
130 views

How can I turn a bowl/glass upside down?

I want to dispense water/cut-vegetables from a glass/bowl(240 ml) by turning it upside down. The screencast shows the idea: I can directly mount the clamp on a servo motor, but I think that will be a ...
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1answer
61 views

Plug & play motors, actuators and drivers system

I was wondering if anyone knew of any easy-to-use plug and play systems, that allow you to build and programme a number of actuators and motors quickly and easily? I'm thinking something like Lego ...
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3answers
4k views

One motor, two wheels (motor direction rotates one wheel forward, reverse for other wheel)?

Rewriting this whole question as I've learned a lot more since I first tried to ask. I'm building a tiny bot and looking to use two motorized wheels for movement, but only one motor. I'll have a 3rd ...
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2answers
163 views

Motor Controller Configuration

With a group of students we are building an exoskeleton for paraplegics. I am part of the Software & Control department and we are designing the motor controller configuration. We have several ...
0
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1answer
56 views

Granite devices Ionicube

Is it possible to enable/disable the 4 Ioni drives mounted in Ionicube individually? It appears with IoniCube that enable/disable applies to all Ioni drives simultaneously. However, Ionicube 1X does ...
0
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1answer
185 views

Implementation of the Control of a Quadrotor, as taught in Aerial Robotics in Coursera [closed]

I completed the course of Aerial Robotics in Coursera and I want to implement what I learned in a real quadrotor. The thing is that when I see the equations given like this: For the sake of the ...
4
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2answers
24k views

What is the difference between DC motor with encoder and DC with out encoder?

My question is: what is the difference between DC motor with encoder and DC without encoder? As long as I can control the speed of DC motor using PWM, for example on the Arduino, what is the ...
3
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1answer
208 views

Series Elastic Actuator (Passive compliance) vs Impedance or admittance control

I have designed a 2 Degree of Freedom robot using dc motor and gearbox. However, I wanted the robot to be compliant as it'll be used in an unstructured environment with humans. I wanted to know if ...
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2answers
347 views

IMU in a gimbal system

I have short question about the alexmos gimbal controller. The Controller receives the gyroscope and accelerometer sensor data from the IMU, that is mounted on the camera. In optimal case, the camera ...
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3answers
3k views

Connected battery, esc and motor does not power up the arduino

I am currently doing my first arduino project and i am having trouble finishing it. I have a 3s lipo battery connected with an esc (120A) that is connected to a motor (270KV). From the esc i am ...
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1answer
42 views

Motor-controller with path output [closed]

I'm entirely new to robotics and have the following design requirement for a project I'm working on: Given a robot capable of positioning an object in three dimensional space ( vis. a plastic ...
4
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2answers
339 views

Should I use an arduino to control my balancing robot's motors?

I'm building a 2-wheel balancing robot from old parts. DC motors from an old printer, wheels from a BBQ, bodywork from an old optical drive etc. The brain of the robot is a Raspberry Pi 3. I'm using ...
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1answer
434 views

How to dimension a 3 DOF robot arm with RRR configuration?

How can the maximum length and mass of the linkages of a RRR type robt arm be calculated, if the motor's mechanical characteristics are given?
3
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2answers
1k views

Driving sensorless three phase BLDC motor with Arduino and IMU

I have started to work on a little project of mines, which consists in implementing the stabilization a single axis gimbal using Arduino. The gimbal is driven by a sensorless three phase brushless DC ...

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