# Questions tagged [motors]

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

554 questions
Filter by
Sorted by
Tagged with
30 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 ...
19 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 ...
1 vote
64 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 ...
• 11
18 views

### 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 ...
• 1
1 vote
28 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 ...
• 31
37 views

### 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 ...
70 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 ...
41 views

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=...
58 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 ...
1 vote
60 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 ...
1 vote
47 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 ...
29 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 ...
28 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 ...
• 101
1 vote
46 views

### 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). ...
28 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 ...
49 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 ...
• 101
55 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 ...
18 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). ...
• 113
29 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 ...
159 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 ...
• 119
60 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. ...
40 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-...
• 101
18 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. ...
55 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 ...
• 175
17 views

### 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 ...
• 23
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 ...
1 vote
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 ...
366 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 ...
• 1
1 vote
62 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 ...
• 4,791
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 ...
• 101
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 ...
32 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 ...
122 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,...
27 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 ...
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 ...
• 1
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 ...
1 vote
92 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 ...
75 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 ...
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 ...
187 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 ...
• 235
34 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 ...
93 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 ...
• 187
55 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 ...
1 vote
54 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 ...
• 11
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.
36 views

### Calculate constant power applied to displace a mass a given distance within a given time

I'm trying to determine electric motor power sizing with requirements given for covering a particular distance within a certain time. The knowns are the vehicle mass, the allotted time, the target ...
31 views

### How are the motors coupled to pulleys in this scara robot?

Several years ago the CoRETS group posted a animated video about a novel SCARA robot https://youtu.be/P3iIIqFkSIc but there are no references to it in the literature. I cannot understand how the two ...
• 273
1 vote
52 views

### Remove slack from geared stepper - without touching the gearbox?

I have a Nema 11 stepper motor with a planetary gearbox and think it is a great stepper motor for a project I'm trying to do. One thing I noticed is that the output shaft of the gearbox has some ...
• 11