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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23 views

How to measure an optical encoder resolution and gear ratio?

I've bought a DC geared motor with an optical encoder. The vendor didn't provide specification. I can read MITSUMI M25N-2R-14 2241 and 25GA-370-12V-330RPM on the motor. There are some pages on the ...
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151 views

Torque calculation for a shaft end effector

I would like to calculate the max torque and the rpm to select the right motor. the application does not require a very fast rotation speed (rpm) however it should be accurately controlled. I ...
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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 ...
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Connect LiPo battery to Arduino Motor Driver Shield for RC Boat

Thanks for taking the time reading this question! It is greatly appreciated. What are we doing We (two complete noobs) are building a remote controlled boat from scratch using Arduino compatible ...
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Required motor torque for a small boat

What: We are building a small boat made of a special paper foam soaked in glue and epoxy. It is aproximinatley 40 cm long and 15 cm wide. Very light. We aim to transport a single can of beer at the ...
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How to drive a motor by Python

I need to drive any small motor (with small delay) by Python without low level programming. What hardware and software I need? Does "Robot Mesh Studio" fit for this? I want to make a robotic ...
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2answers
807 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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DC motor modelling with Bond Graph

I am trying to construct an equation that describes the output torque as a function of lambda and omega I have obtained the following bond graph but I am unsure of how to proceed.
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2answers
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Robot - Wall Avoiding (Plinko Robot)

I am looking to build a robot that will travel and zig-zag down the hallway.It will be headed towards a wall at roughly 45 degrees and then use a IR LED to detect when a wall is nearby. From there, ...
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279 views

Why to seal a motor shaft, or the whole motor, for underwater ROV?

I just finished a competition for underwater robots. The water is about 40-50cm in depth and 90% of the designs just exposed the thrust motors completely in the water similar to the picture below and ...
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211 views

motor controlled lazy susan

I'm trying to figure out an easy lazy susan setup. This is for video production, I want to be able to put an object on the platter and get a smooth consistent turn in order to shoot the object ...
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I need to make something that can slam something into something else really fast in both directions

I'm fairly new to robotics, but I have this idea for a machine. I've done a bit of research but can't find exactly what I'm looking for. I need something that can either move back and forth at at ...
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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. ...
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4answers
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Quadcopter motors vibration problem

I built an Arduino Due based quadcopter, with MPU-6050 for auto levelling and BMP-085 for Altitude. I am using Kalman filter code from here for the MPU-6050 to take the Roll and Pitch angels from the ...
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1answer
32 views

Voltage not registering when motor is connected?

I'm trying to fix my kid's power wheel. When you press the gas pedal, nothing happens. I took it apart and checked everything. I noticed that when I disconnect the wires from the motor and check them ...
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1answer
31 views

How to attach plate to stepper motor?

Total noob here (never touched Arduino before today), & have pretty much no hands-on technical experience (although with lack of experience, I make up in enthusiasm to learn!) Question: How do you ...
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2answers
100 views

Equations of motion in matrix form and energy consumption

I am working on Lagrangian derived high-dimensional motion equations for a robot in matrix form. The structure of such an equation is known: $M(q)\ddot{q}+C(q,\dot{q})\dot{q}+G(q)=0$ In here, $M(q)$, $...
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4answers
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Automatic forward and reverse Brushless Motor

The video Here shows a motor using rotational motion to move a load forward and then reverse back, without manually switching it to reverse. How can I program my brushless motor to operate like the ...
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Given this old pin diagram and numbers on this old encoder, what would be a suitable modern encoder to use?

My place of work has recently acquired a Hydraulic Press Break from the 80's. It has a CNC controlled back stop which is driven by a DC motor and Screw drive. The encoder which couples to the motor ...
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1answer
145 views

Moving clock arms individually

I have as project to build something like this ( using arduino if possible ): http://clockclock.com The one modelization that came across my mind is to take 2 sticks ( as clock arms ) and command ...
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1answer
82 views

Can't run DC Motor with Arduino and Adafruit Motor Shield

I'm very new with Arduino and Adafruit and I'm trying to get a DC motor running with my Adafruit Motor Shield V2.3, but it's not running. I have connected the motor to the right terminal (M3). I'm ...
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2answers
7k views

What is a CIM motor?

I'm trying to make decisions for motors on a robot build. I keep running across CIM Motors. What is a CIM Motor? Where does the designation CIM come from? What does CIM mean?
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148 views

Stepper can't turn plastic wheel. Is it normal?

Is it normal, that a stepper motor with the following specifications can't reliably turn a plastic wheel with a diameter of 13cm and a simple direct coupling? Type: bipolar, two phases Voltage: 2.55V ...
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Why use timing belt drives in Stepper Driven Robotic Arm

This may be a noob question. I am sorry if it is but I am new to this field. I am working on a design of SCARA Robot and I am using Stepper Motors to drive it. In many youtube videos, I have seen that ...
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38 views

gear motor with encoder and Arduino Uno

I'm working on a project where using a gear motor with an encoder and an Arduino Uno. I have not done Arduino in a long time and am struggling getting it to do what I want. If you look at the wiring ...
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92 views

Can I apply a common voltage to a high speed running DC motor to stop it? Will it damage the DC motor?

I decelerate the velocity of my robot very quickly by applying a common voltage (eg. 24V to both the terminals using Motor driver) to the DC motors. Given, the motor is running at a very high speed ...
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Motor Drive Sizing Drive continuous current / motor continuous stall current Ratio

I have a question about the ratio of the drive continuous current / motor continuous stall current. I read that a good ratio between these values is around 2, but cannot find an explanation why. I ...
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I’m not sure how to calculate the torque of a tank chassis what values do I need?

So I plan to build a robot-tank thing. It’s max weight will be 35kg and it’s driving wheel will have a radius of 0.05m. Those are the two values I know for certain and there will be no gears between ...
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44 views

Find viscous friction for DC motor transfer function

How do I find the viscous friction for my DC motor without measuring the input current and output torque. I have to do a theoretical model on simulink and can't find any answers on how to find it
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1answer
38 views

Why Hydraulics and Not Motors?

I have noticed everywhere that professional robotics companies use hydraulics over electric motors. I want to know why that is. Why can they make custom electric motors that are really powerful. ...
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1answer
135 views

Torque required to rotate arm with mass at end

I have to calculate the required torque to rotate a point mass of 15N on the end of an 1.2m long arm which I have calculated to be 10kg in mass. The rotation must have a constant angular velocity of ...
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1answer
55 views

What type of electric motor and speed-controlled circuit do I use to bounce a hanging, 5 pound weight? (it's for a Halloween decoration)

I'm trying to make a roughly 5 pound, hanging halloween decoration bounce on a string from about 1-3 times per second, preferably at variable speeds if I can. I've looked up a simple DC motor circuit ...
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42 views

Smart Servo Motor Type Comparison

I have been using the standard MG90/SG90 servo motors for years now and am familiar with them. Recently, I am trying to build a robot dog with them with no success. The motors keep on vibrating and ...
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2answers
98 views

PID controller for motor speed control and distance control

I am building a robot rover comprised of dual DC motors each with hall sensors to obtain rotaional speed. I currently have a PID controller for each DC motor that is able to control the speed of the ...
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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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86 views

Make servo's shaft longer [closed]

I’ve got a few servo motors MG995, MG996R, etc. For my make I need a servo to have a longer shaft – 6cm or so. I cannot find a way to achieve it. There is lots of Shaft Coupler for steppers and DC ...
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79 views

Quadrotor dynamics: How is torque created

I'm a software engineer and I've recently engaged into Robotics field. I've started by a course on Coursera which talks about Aerial robotics and thus quad-rotors. I'm trying to understand how quad-...
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Why isn’t my shaft moving? [duplicate]

When I put my shaft through the vehicle body (small robot) and have the motor attached to it through two rotating gears, the shaft isn’t rotating? I think it’s due to how the hole diameter is the same ...
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Motor failure detection and compensation in quadcopter

I need to perform some analysis on motor failure detection and compensation in quadcopter. I have been using PX4+Gazebo for 3 months and recently found that it does not include motor failure detection ...
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3answers
2k views

Encoder based speed control for Rover 5

I am trying to get precise control over the speed of rover 5 based robot. It has four PWM controlled motors and 4 Optical Quadrature Encoders. I am using 4-channel motor controller with rover 5 ...
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1answer
82 views
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1answer
44 views

Drive axis with slipping gear

I'm looking for a name of the mechanic part (axis-gear combination) with the following description to use it in an automatic window control. I can't find this online to get parts due to the lack of ...
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1answer
62 views

Can I measure torque from this motor by only measuring the current?

I am new to robotics, please forgive/correct any errors. My Project Plan I want to use a PID controlled motor in a human-interface device where I need to measure the user's exerted force on an end ...
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1answer
91 views

Is it uncommon to use a gearbox with a brushless motor?

I've spent far too long this evening researching whether it's possible to clone a Starship; for my own amusement and/or to terrorise the neighbourhood. A Starship delivery robot, that is, not the ...
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Frame Rotation to Motor Displacement

I have the following problem: I have an x,y,z reference frame that is to be rotated around its x-axis and around its y-axis. Three axial motors Mp,Mq,Mr (120 deg apart) are responsible for these ...
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1answer
38 views

How to compensate for back drive caused by gravity

I have a 24v DC motor with a planetary gear box, Hbridge, and encoder feedback that drives an arduino robot similar to a winch that moves a weight by spooling a strap up and down. The problem I am ...
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1answer
51 views

BLDC Outrunner Direction Change?

I'm designing a Quadcopter for my project. I've seen a lot of guides that the motor rotational direction should be opposite to each other. My doubt is whether the motor have a variety of CW rotation ...
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2answers
147 views

No electric motors can handle being stalled for even short periods of time, even at low power. Is this statement true in all cases?

We were using a regular POLOLU d.c motor whose stall current is 0.36A. We want to use this motor in a robotic hand where the motor will be stalled while holding the object. We are limiting the current ...
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1answer
54 views

Motor driver damage and jerking behavior when load driving in same direction as motor

I'm having trouble with a gear motor being powered by a power supply, while it is being driven by the load in the same direction as the driver wants to drive it. Here is a simple diagram: The gear ...
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1answer
58 views

Where to buy cheap motors and mechanical parts for hobby robotics applications? [closed]

My kids want to get into robotics, where Online can I buy the motors (dc,ac,stepper...) and mechanical assembly (nuts, bolts, sheet metal, springs, rods...) for a very affordable price, you know I ...

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