Questions tagged [motors]
Questions regarding motors. All types of motors, their gearboxes, how to drive an electrical motor etc.
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Math proof for why homopolar motors are the best and all the other ones are horrible, stupid and wasteful
So I've been playing around with the idea of homopolar motor and I had an interesting thought experiment I wanted to see the results of. So I hopped onto FEMM 4.2 and drew up 2 flat parallel N52 ...
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How to balance an irregular shape on a motor shaft?
I have an irregular shaped object about 100g in weight and 3x3x3 cm in size that I'd like to mount on a shaft (eg of a small motor) and spin. The trick is, I'd like it to be pretty close to perfectly ...
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Does an off the shelf electromechanical device exist that does rotary oscillations
Does an off the shelf electromechanical device exist that does rotary oscillations?
Similar to a torsion pendulum motion or a rotary spring but gets some energy supplied by electrical means to help ...
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Is there a type of motor or gear (or combination) that can match back driven resistance automatically?
For a fun project I wanted to try building a small workout machine based on the backdriving of a motor, that would match my force - or my force minus some small amount. Eventually I'd like to connect ...
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How does the efficiency curve of a well pump shift with speed?
Well pump manufacturers publish "efficiency curves" for well pumps, such as this one (the curve that is most sharply convex down, whose Y axis is read from the "% EFF" scale on the ...
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how to find the motor specification
I need a motor for my project. My aim is to move a 10 kg mass using a belt pulley system, with a velocity of 15km/hr to a distance of 3.6m. The maximum time for moving the same is 1.5 sec.
Can ...
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Does the frequency of input voltage in induction motors have to be continuously altered?
I understand that for magnetic lines of the rotating magnetic field to cut the windings of the rotor (and induce current), the field has to rotate at a slightly higher rate than the rotor. But if we ...
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Impact on high frequency radial forces on ball bearings
Dear Stackexchange forum,
Do high frequency radial forces (e.g. 6kHz) do significantly increase wear and reduce the life span of ball bearings?
I am looking for an expert in ball bearing research ...
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Pumping machine (Centrifugal ) fails to pump
I have a centrifugal pumping machine that fails to pump up consistently. When powdered on, it spills up water, then stops and continues intermittently like that without a consistent flow of water out. ...
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off-scale torque measured - what is my torque arm?
I have assembled a benchtop torque measurement stand for evaluating electric motor and controller efficiency.
The motor is 49kV , 5kW brushless outrunner.
Input power reading is taken from motor ...
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What will happen if we place a couple of separate, small stators around a long rotor instead of 1 large stator around a short rotor?
My original theoretical consideration was using the electric motor's rotor as drive shaft in a car. It led me to this question: "What will happen if we place a couple of separate, small stators around ...
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Mechanism to engage and disengage a motor shaft
I have a motor attached to a spool, attached to a string. The string is attached to a rod that is able to move backwards and forwards freely but when the rod is pulled back too far it compresses a ...
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How do I match a VFD to an AC motor?
I have a 1 HP, 4-pole, 3-phase, AC motor which is inverter rated.
I need to select a Single Phase VFD to drive the motor. Some of my options are as follows:
1 HP, 120V, 3.7 amp
1 HP, 240V, 3.7 amp
1....
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Will this pulley system work?
I want a system to move something in the opposite direction to the driven thing, but twice the distance. I'm thinking the below system of pulleys. I just wonder if it will actually work or will it ...
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How can I calculate the power and torque required for the motor on a wheeled robot/vehicle?
How can I calculate the power and torque required for the motor on a wheeled robot or vehicle if a particular acceleration or movement up an incline is required?
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What are the issues with using a general purpose motor on a variable frequency drive?
What happens in this scenario - a modern electrical motor, three phase, squirrel cage, that is not specifically designed for operation via frequency inverter, is in fact operated on an FI? How long ...
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Slip ring mounts
I am trying to research slip rings and their mounting options in order to design a BOM for a project that requires it.
Since I am still in the early design stage, I haven't chosen a type of motor, but ...
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Torque Required for a stepper motor to rotate a socket wrench ratchet around an axis point
I'm trying to build a kinetic machine that rotates socket ratchet tools (e.g. https://en.wikipedia.org/wiki/Socket_wrench) to make a bunch of ratchet 'clicking' sounds for an art project. I'm trying ...
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Will providing below rated torque to a DC machine acting as a generator still allow it to rotate?
I'm working on a system that will generate electrical power from a mechanical input. If the mechanical input is unable to generate the required torque to meet the rated torque of the DC machine, will ...
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Is there a special wrench used to remove this servo tachometer?
I tried using a pulley puller with moderate force to remove the tachometer but it didn’t seem so budge (although I didn’t use heat to soften potential adhesive inside).
Looking at the shaft I can see ...
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how much power is needed to move a linear axis
Ι need help calculating the power usage for a linear axis motor. it must move up and down at a maximum speed of 0.5 m/s a load of 50 kg
What I did so far:
The load (i.e. weight) acting on the motor ...
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How to look for a stronger electric motor for a DIY candy panner?
I'm an amateur working on a candy panner project, similar to this one but with a dedicated motor instead of an attached drill. After some experimentation, I have a working V1 that I successfully used ...
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Pressure Boosting Pump Running Overcurrent
I'm working on an industrial water re-circulating system that is having an overcurrent issue that is baffling everyone involved (design engineer/plumber/electrician/pump and motor Mfg).
The system ...
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Worm drive vs Cycloidal Drive
In robotics, I've seen quite a few people make use of cycloidal drives. They seem robust, compact and have a relatively simple design, while still achieving high reduction ratios.
Yet outside robotics,...
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Unstuffed to Stuffed Two Stroke Engine
I'm working on a Puch e50 Engine.
The original engine used an unstuffed crank that had bushings instead of bearings. I've rebuilt the engine using new seals, bearings, and an aftermarket stuffed ...
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Geared Motor vs Direct drive with external gearbox
I'm looking to buy a small DC motor (~12W) which rotates at around 60rpm.
I have two options:
Get a geared motor which has an integrated gear box such that the output shaft rotated at 60rpm.
Get a ...
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How does wheel size directly driven by the motor affect the torque/speed/rpm applied to contact surface
I'm designing a compact tennis robot (ball launcher). I built a very decent prototype that is drastically lighter and smaller than what most others have built, is it's built using two brushless direct ...
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Flopping toy mechanism design
I've bought a flopping toy for my kid. The toy looks like:
Unfortunately, the toy mechanism inside jams when grabbed and the battery lasts for a short time:
I tried to do my own mechanism, printing ...
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How do I wire up this Single Phase AC Motor? (Wye Arrangement)
The no-volt-release switch stopped latching on my single-phase planer thicknesser. The motor is under 1.1kw (1.5hp) and I understood that I would be able to drop in a generic switch.
However now ...
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Why are the synchronous reluctance motors not self-starting?
I have been studying synchronous reluctance motor since a month. I am curious to know why is this motor not self starting?
If used with an inverter, this motor can be made self-starting. Or by adding ...
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High RPM CVT for Spindle Motor
I have been messing about with a 20k RPM spindle motor and want to try to have some more low end torque. I was thinking about using a belt or chain CVT so I can smoothly change gear ratios but is ...
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what kind of Vibration Motor should I choose and how can I achieve my goal?
I'm building a vibration table for testing the durability of a metal rack, I want the vibration motor to create an even and average vertical displacement to the table, what kind of Vibration Motor ...
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How to calculate the torque created by a rotating motor?
I have watched this video where the speaker explained how the vertical spin of a quadcopter is stabilized, and how it could be unstabilized to make the drone rotate.
Here is a screenshot of the video,...
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How does the magnetic field in a synchronous machine with two pole-pairs distribute if I only apply DC-voltage on two phases? (Star connection)
I am struggeling to understand the following:
If I consider a synchronous motor with only one polepair and apply dc-voltage to two of the three phases this results in a static magnetic field.
The ...
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How to choose correct motor for my application?
I'm looking to play around with making a massage pad that I can lie down on and has massage nubs that are motor driven. There will be a motor that rotates the nub (the part that does the actual ...
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What's the minimum torque needed for 2 DC motors for moving a 1 kg object on top of them?
I have a weight of 1 kg and I want to properly choose 2 DC motors for them in order to be able to move the 1 kg of weight with variable speeds in the range of 0 to 1 m/s with an increment of 0.05 m/s. ...
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How to calculate torque requirement for vehicle with Mecanum wheels?
What are the changes specific to mecanum wheels when calculating torque requirements for a vehicle. I have the data for the vehicles mass, top speed and top acceleration.
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Using a Lead Screw To Create a Two Stage Clamping System
I want to use a motor to drive a lead screw that first brings down a platform that locks into place and then controls a secondary platform to apply pressure but using only a single motor.
As an ...
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How do I find the optimal/best Gear ratios for an 3-speed transmission of an RC car?
[was told to post here, from physics stackexchange]
Says it in the title - I've done a bunch of stuff so far, but my work seems to be wrong.
I'm trying to build an RC car (pretty small, about 25 cm in ...
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Help with design of linear actuator
I am working on an automated gate positioner for a drill press. This gate will move back and forth by a set distance so lining up the drill press is automatic.
I have tested with the Z axis of a cheap ...
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Get engine rpm using accelerometer
I'm studying the possibility to read an engine RPM by reading the vibrations of it. Basically an engine is "oscillating" on a car chassis on all 3 axes (X, Y, Z) but mostly on the Y one. When ignition ...
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Calculation for Motor Selection
I need help with the selection of a motor and a motor driver
I need to spin a 700g (65mm radius) round ball at 35,000 RPM. I need to bring it up to speed slowly, so I also need a motor driver/speed ...
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Torque calculation for DIY friction wheel drive electric unicycle
I’m building a friction wheel drive electric Unicycle.
Something like this;
My question is how much torque should the friction wheel drive motor have considering the total mass of unicycle including ...
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Calculating needed motor to spin a disk at low RPM
I'm designing a machine that I need to spin a horizontal disk at low RPM using a motor and gearbox. I'm not good at physics so I need help to find a motor/gearbox to fulfill my needs.
It's a ...
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Looking for a linear actuator that can carry a transverse load? Does such a product exist?
I am looking for a product that works like a linear actuator where you can control how far it extends but it can also hold a transverse load at the furthest point of extension.
What I am looking for ...
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How does vibration monitoring with engine power differ?
How do engineers design vibration monitoring for motors with different wattage?
What effect does power have on vibration?
I consulted manufacturers of these vibration monitoring and did not see any ...
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What mechanism would you use to lift, then at a certain point release something with a pulley, string & motor
I'd like to lift an inflatable cow up to a pulley I threw over a high branch and then release it to fall when it gets to the top, and then repeat the process. I currently have a loop of string between ...
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Torque Required From Motor For a Project
The device I am building is responsible for supporting 200 lbs and is required to accelerate 10 feet per second. The device will have two 8 inch diameter wheels. I have worked out what I believe to be ...
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Method to achieve a constant force no matter the actual velocity when under load
So, this might be a somewhat strange need, as I don't seem to see many resources on this. I'm trying to create a device where I can set an amount of force for it to generate, and when it would behave ...
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How can I model a hysteresis curve from data?
I have the task of modeling the current to torque mapping for a given motor. I have an experimental set up where I can retrieve current, torque pairs.
Now my initial approach was to model the ...
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