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Questions tagged [motors]

Questions regarding motors. All types of motors, their gearboxes, how to drive an electrical motor etc.

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How can I calculate the required motor torque to push a weight of approximately 15 kg?

I am working on a machine where I need to push a material weighing around 15 kg. The system consists of a motor and a ball screw mounted on the same axis, connected via a coupling. The ball screw has ...
Saiyam Shah's user avatar
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1 answer
27 views

Fixing problem with simple brushed DC motor not moving

I was following a tutorial for a brushed motor (this one: https://www.youtube.com/watch?v=NbcJvGk72HY), and it spins. However, there is a problem when the coils of the stator is directly parallel to ...
Joe Dahl's user avatar
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33 views

Needs help with assembling the idea of engaging a DC geared motor with hanging cable spoolers

So I have these cable reels/spoolers of TRIAX camera, and I want to coil/unwind them using a geared DC motor I want to use one DC geared motor for all of them, so I thought of making the DC geared ...
Mohammed Adnan's user avatar
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1 answer
40 views

Could a 48V 1000W DC motor with a 5:1 gearing to the wheels, accelerate a mass of 150 kg from stationary to 6.7056 m/s in 5s

I am contemplating building a ride on electric golf buggy using a single 48V DC 1000W motor. The mass inc golf clubs, batteries and rider would be 150 kg. Driven rear wheel diameter is 330mm. Gearing ...
Alan Twigg's user avatar
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22 views

Can i use a metal gear servo motor to lift a 4kg load and then attach it to an actuator?

I am doing a project if which i am trying to resemble some muscle movements of an arm and i want to attach an actuator to a motor. But i don't know if a metal gear servo motor can lift that much load. ...
Muhammad Azlan's user avatar
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31 views

Why do engines with cylinder offset not suffer from increased frictional losses on the compression and exhaust strokes?

I recently watched the D4A YouTube video on cylinder offset, and for the most part it makes sense. Longer power and intake strokes, lower frictional losses on the power and intake strokes, greater ...
Ryan W.'s user avatar
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21 views

How to find angular offset in a star tracking camera system

I am designing a star tracking camera system. This system has a camera mount which can rotate 360 degrees in the azimuth direction, and ~180 degrees in the altitude direction. I have successfully ...
user47892's user avatar
1 vote
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71 views

How to calculate the torque disturbance of an unbalanced flywheel?

I would like to understand how an unbalance of a flywheel affects the dynamics of a simplified mechanical model. Assuming that the mechaincal dynamics can be modeled as (neclecting inertia of the ...
Zeit's user avatar
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What does the resonance frequency mean in inertia matching

Like Kollmorgen shows in this PDF how you can calculate the resonance frequency of a motor coupled to a load. But with what can I Compare this frequency? It is clear that a higher resonance frequency ...
fpl's user avatar
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1 vote
1 answer
29 views

How to compensate for the activation torque of a harmonic drive

I've got a 30:1 harmonic dive sourced for a 3508 BLDC motor, which outputs around 4.7 Nm (peak 7.9 Nm). But there is an insane activation torque of 1 Nm, when using ROS and PID, leads to not being ...
Zyleyus's user avatar
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Seeking Alternatives for High-Frequency Vibrating Mechani

I am working on a project where I need to create a system capable of vibrating a device rapidly, akin to simulating the flapping motion of birds. The crucial requirement is that the vibration ...
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88 views

How to adapt a threaded drive shaft to a keyed shaft (for use with V-belt pulleys)?

I am sure there is a very simple answer to this question, but with no formal mechanical engineering education, I don't know what it is. I have a 2.5 HP, 3,450 RPM continuous duty electric motor with a ...
Colgate2004's user avatar
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42 views

Load torque required for driving lead screw

I want to calculate motor torque for lead screw mechanism like this (horizontal) I want equation to calculate this mechanism to find motor. I use this equation https://www.youtube.com/watch?v=...
Grittapop Buayam's user avatar
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1 answer
76 views

Force and motor calculation on a moving chain sprocket system

I have a chain sprocket motor system used to move a load up. Usually I think the load would be the charge use for calculation and the torque should correspond to the load times de radius of the ...
Ricko Bambino's user avatar
1 vote
2 answers
62 views

Is there any way to stabilize the motor speed using only electronic circuits rather than using a tachometer or an encoder as feedback?

I have a small, 4W, 24 VDC, PMDC gear motor. When feed from a 24 VDC regulated power supply the motor current is decreasing and speed of unloaded gear motor is increasing about 5% per hour. The ...
Star REB 7's user avatar
1 vote
0 answers
49 views

Electric motors and Internal Combustion Engines compared

I know that Internal Combustion engines are rated in terms of peak power developed, while electric motors are generally specified in terms of continuous power output. Is there a good way to determine ...
Slartibartfast's user avatar
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1 answer
30 views

Impact of generator start-up on its health

In this paper, the authors state that the wear effect of a genset star-up is comparable to the wear cause by 1 to 4 minutes running at full load. This paper dates from 1993, I am looking for a more ...
genset123's user avatar
0 votes
2 answers
29 views

How do rotate a picture on a wall once every 24 hours?

I have a picture with various day and night scenes that I would like to hang on a wall and have automatically and uniformly rotated once every 24 hours. The picture is roughly 55cm in diameter, 2cm ...
Slarty's user avatar
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Counter-intuitive behavior of chain drive

In a chain drive system, sprocket 2 has a motor attached, sprocket 1 is being driven. The blue construction is static and immobile. Before starting the motor, both load cells show 0 (tare). ...
FlegmatoidZoid's user avatar
0 votes
1 answer
33 views

Gyroscopic precession

My question is about a school project I am working on; a beam can rotate freely on the horizontal axis. If one motor (or multiple) is attached far from the pivot the beam should rotate. I am trying to ...
Anonymous's user avatar
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1 answer
55 views

Explanation of phases of fridge cycle from power draw (power factor, reactive and active power)

I've got this power draw graph of my fridge during a couple of cycles. The power factor axis is on the left, active and reactive power axis in watts/VAr on the right. I'd like to understand the phases ...
JavierG's user avatar
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1 answer
60 views

How do AC servos have constant torque region?

I have been learning about AC servos for a project. As i look through the torque speed curves, I get stuck. I understand how to use them, but I am baffled by the shape. I was always taught that there ...
DanielPatrick's user avatar
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19 views

Interpreting eigenvalues of non-normalized covariance matrix in system identification

Cross-posted from physics stackexchange Summary: Eigenvalues of a "non-normalized" covariance matrix of time-series measurements from a linear system have units of Action (energy * time). ...
user3716267's user avatar
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32 views

Using Relay and contactless water level sensor to switch on or off motor pump

I have no prior experience related to electrical projects and I am having confusion about which type of relay and how to connect relay, contactless water level sensor and motor pump. So basically I ...
Basmati_Reis's user avatar
0 votes
1 answer
186 views

How (or should I) to connect a D-shaft to a load, through a bearing?

I have a gear with a D-shaft that is intended to directly drive a turntable. Something relatively heavy at very low speeds and with not much torque, if it's important. I really don't want the gear to ...
TQQQ's user avatar
  • 119
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61 views

Machine with Multiple Motors and Fusing?

We have some old machines that I'd like to overhaul the electrical on. They are wired like in the schematic I provided. L1, L2, L3 come from a fused disconnect on the machine with a set of 30A fuses. ...
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41 views

Help with syncing the angle of a fan to the rotation of an external shaft

I have a 20-pound fan whose axis can rotate 360 degrees in the east-to-west plane but needs to rotate in sync with a separate external shaft. As depicted in the attached image. I plan to use an on-...
Python House's user avatar
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0 answers
20 views

What kind of motor can simulate weightlifting? (Difficult to move from locked; can rotate ever so slightly when force is applied)

Recently, I came across a product that is basically just an exercise mat with two cables for lifting on it. It markets itself as "digital weight", and can simulate weight up to 400 pounds. ...
nick carraway's user avatar
0 votes
1 answer
56 views

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 ...
Alex I's user avatar
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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 ...
axawire's user avatar
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0 answers
23 views

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 ...
MikeK's user avatar
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1 vote
1 answer
64 views

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 ...
Oliver Walters's user avatar
0 votes
3 answers
409 views

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 ...
amir's user avatar
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1 vote
1 answer
66 views

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 ...
mart's user avatar
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0 votes
0 answers
27 views

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 ...
Abion47's user avatar
  • 101
0 votes
0 answers
14 views

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 ...
user2059972's user avatar
0 votes
0 answers
33 views

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 ...
Kevin Sanders's user avatar
0 votes
1 answer
143 views

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,...
testing09's user avatar
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0 answers
28 views

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 ...
testing09's user avatar
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0 answers
19 views

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 ...
Loo's user avatar
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0 votes
1 answer
26 views

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 ...
Phaselancer's user avatar
1 vote
1 answer
96 views

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 ...
Jason Long's user avatar
0 votes
1 answer
78 views

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 ...
bepispasta42069's user avatar
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0 answers
30 views

Help identify this belt please?

Can you help me identify this belt? It is 2mm wide and has a length of 133mm. It is a drive belt in a tape player from the 70s. It is exceptionally thin almost like a plastic film. It does not feel ...
alistairboyer's user avatar
0 votes
2 answers
196 views

Flywheel power vs. Gross power in bulldozers

In product specifications of bulldozers, the manufacturers give several figures for the engine power, such as flywheel power, net power - Net SAE J1349/ISO 9249, ISO 14396 power, and Gross SAE J1995 ...
Triceratops's user avatar
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0 answers
35 views

How to manufacture Inrunner BLDC motor core

I need to make a 10 slot BLDC inrunner motor core that is 40mm wide has 10mm inner diameter and 10mm thick. How would I make this? I would want to make it out of mild steel but I do not have a CNC ...
Yassin's user avatar
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0 votes
1 answer
98 views

What are the protrusions on the side of some electric motors?

The question is straight forward. What are the protrusions attached to the main cylinder of this electric motor? This one has two protrusions that are the same size. Others, like the motor for my ...
Rekov's user avatar
  • 187
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0 answers
62 views

Bi-directional rotary to linear locking mechanism

I'd like help coming up with a simple brushed DC motor-powered mechanism that achieves the following. Rotating the motor clockwise causes a linear mechanism (a pin) to arrive at position A Further ...
user42570's user avatar
1 vote
0 answers
62 views

Examples of uses of different voltages as seen on motor nameplate

The electric motor nameplate (pictured) has a variety of different voltage configurations which are listed. I understand that the motor can be configured to run on different voltages by changing the ...
hamslice's user avatar
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0 answers
20 views

I want to simulate Motor output WRT throttle

I don't have any idea on how to get started. Can you mention required relations and concepts to get started.
Yetukuri Revanth's user avatar

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