Questions tagged [motors]

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

Filter by
Sorted by
Tagged with
0 votes
0 answers
8 views

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 ...
0 votes
1 answer
31 views

Can I drive a pulley with two shaded pole motors using one motor at a time with different size pulleys for speed control?

Using two same RPM shaded pole motors, one with a one inch diameter motor and one with a two inch diameter. Using a DTDP switch to swap power from one pulley to the other. For a two speed rotation ...
1 vote
1 answer
32 views

Wear and tear on motors - soft start, also wear impact of sudden power loss?

I understand that starting and stopping electric motors puts a lot of strain on them compared to running them continuously. I suspect that a lot of this strain is due to the sudden inrush of current ...
0 votes
1 answer
69 views

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 ...
0 votes
1 answer
98 views

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 ...
0 votes
2 answers
124 views

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 ...
2 votes
4 answers
3k views

How does single-phase AC synchronous motor work?

In a recent question of mine about microwave plates, jpa correctly identified the type of motor used for microwave plates as a specific variant of AC synchronous motor, equipped with gears that reduce ...
0 votes
2 answers
45 views

Will the torque applied to a circular object be the same if the object isn't aligned in the center of the Torque?

I'm a student designing a system to automatically turn a steering wheel. In this design the motor will be in the center of the steering wheel and it will apply it's torque on the steering wheel ...
1 vote
0 answers
40 views

Why does an electric motor, of 800 kW at 400 V, have 7 connectors for power cables?

I found a Vybo electric motor and noticed that it has seven connectors for power cables. I also found a Variable Speed Drive, Altivar Process ATV900, System ATV960, 800/630 kW, 400 V and its datasheet ...
4 votes
1 answer
2k views

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?
1 vote
1 answer
100 views

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 ...
1 vote
2 answers
290 views

Can an electric motor act as a load for the electric generator rotated by that motor?

I have an experimental generator and an off-the-shelf motor that I intend to arrange like in Fig. 1. The problem is that if I connect the required load to the output of the generator the power drawn ...
0 votes
0 answers
12 views

RS-550 motor only spinning in short bursts

I bought four of these motors, brand new and they all have the same issue. Amazon RS-550 I am a bit confused by the Horsepower: 100 watts claim. The motors require 12V from various specifications I ...
0 votes
1 answer
32 views

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....
0 votes
0 answers
23 views

Brushless rotor - identify black shroud

I'm a hobbyist learning about motors. To this end I've salvaged this brushless motor from scrap. It has 4 magnets to its rotor, but they are encased in some black material. Can anyone help me identify ...
1 vote
0 answers
40 views

Electromagnetism - DC Motor Design Question - EMF/BACK EMF

I'm not gonna lie - I don't have enough knowledge about EMF and Back EMF so I need you guys , my friend will soon build a DC motor for me but I currently have no idea what design will produce high ...
0 votes
0 answers
22 views

What's the best way to attach 1 motor to 2 separate wheels on an electric skateboard?

I am in the process of building an electric skateboard. I have all the electronics working and now it's time to put together my skateboard. The problem I am having is that I only have 1 motor and ...
1 vote
1 answer
160 views

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 ...
0 votes
0 answers
18 views

Cam for linear actuator from a DC motor

I have a DC motor with known characteristics like torque, speed, etc... The actuator (in green) is like a piston and I know it must be operated as follow: with a force > 60 N the full stroke is 5 ...
2 votes
2 answers
91 views

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 ...
0 votes
1 answer
44 views

How to pick a motor that won't stutter/vibrate?

I built a system that has 4 rods with a block attached at the end that rotates in a circle and stops every 1/4 revolution of a cycle. It then starts back up after a certain amount of time. What I ...
1 vote
1 answer
207 views

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 ...
0 votes
0 answers
20 views

Constant-force actuator for a lifting plate

Thank you for this forum. I am writing here because I struggle with a mechanics problem. I am designing a lifting device for heavy charges. The load (F) is applied to a top plate. I would like this ...
0 votes
2 answers
42 views

Understanding the units of columns in MaFaulDa Dataset

Recently I am learning about the MaFaulDa machine failure database. I am wondering about the unit of column zero (tachometer signal) measured by Monarch Instrument MT-190 (as announced by database ...
0 votes
2 answers
50 views

"No Load Speed" for Series DC Motor - What does it mean?

The datasheet for the Maxon 110121 series-wound DC motor lists both "No Load Speed" and "No Load Current" as data points, and I do not understand what it is trying to communicate ...
1 vote
2 answers
114 views

System identification of a simple motor with only position measurements

(Cross-posting from statistics stackexchange) Say we have a permanent-magnet DC motor that roughly obeys the system equation $$\ddot{x}(t) = \alpha \dot{x}(t) + \beta u(t) + \gamma $$ where $x(t)$ is ...
1 vote
3 answers
286 views

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,...
0 votes
1 answer
72 views

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 ...
0 votes
1 answer
40 views

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. ...
0 votes
1 answer
44 views

Connecting a brushed direct drive motor to a wheel with no holes in the hub

I am building a 4 wheel drive rover robot. I was very lucky to find four good condition wheel chair motors on the side of the road. I had to disassemble the wheel chairs of course but well worth the ...
2 votes
1 answer
107 views

Determining the torque needed for a servo motor

I'm looking for a bit of clarity on a design I have in mind. Please bear with me as I have no background in physics, engineering and this is part of my first real DIY project, so the knowledge base ...
2 votes
2 answers
224 views

Torque Problems vs Motor Problem?

I want to preface this by saying I am software engineer so each part of this robot build has been a lesson on its own. From welding, to CAD design, pillow block bearings, etc, etc.... I am working ...
0 votes
1 answer
49 views

How to slow down an electric motor for pull cart?

I'm trying to retrofit an electric motor (such as this) to a pull cart as depicted below. I got most things figured out except for how to slow down the motor to a pedestrian speed. Could I slow it ...
0 votes
1 answer
55 views

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 ...
0 votes
1 answer
398 views

Connecting a custom 3d-printed part to an SG90 servo

I've very recently got into prototyping as I'm working on a project that I intend on making as simple as possible through conventional methods, just to learn general best practices. I have an SG90 ...
0 votes
1 answer
66 views

Will the cart steer to the left/right by itself in this design?

I'm trying to retrofit a pull cart with electric motor. So, one wheel will have an electric hub motor and it is connected to a rotating shaft to the other non-powered wheel. The driveshaft is ...
0 votes
1 answer
62 views

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 ...
0 votes
1 answer
348 views

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 ...
0 votes
2 answers
32 views

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 ...
1 vote
1 answer
59 views

In a AWD Tesla Model 3, why is the front and back motor different?

In a AWD Tesla Model 3, why is the front motor (OEM 1120960-00-E) different from the one in the back (OEM 1120980)? Why not just use the same one for both front and back? I'm sure that there was a ...
1 vote
2 answers
119 views

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 ...
2 votes
2 answers
85 views

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 ...
1 vote
3 answers
128 views

Why aren't pneumatic/hydraulic artificial muscle actuated humanoid robots more common?

I'm designing a humanoid robot using pneumatic artificial muscles. I chose these actuator units because they're much cheaper than electric motors of comparable power output capability. instead of ...
4 votes
4 answers
92 views

How can I map a global spherical position of a central normal vector to the rotation of 2 perpendicular motors?

I have a machine that rotates two concentric frames. The outer frame has a motor that rotates it relative to the global y-axis, and the inner frame has a motor that rotates it about the outer frame's ...
4 votes
1 answer
462 views

Quick return mechanism for spring-loaded screw

I am looking for a way to convert rotary motion to linear, but it should take less energy to get back to initial position than when going from initial position to the end position. Specifically, a ...
2 votes
3 answers
89 views

Relation between armature voltage and mechanical power in electrical Engineering

I am searching for an effect chain that leads to the mechanical power $P_{mech}$ of a DC motor, starting with the applied armature voltage $U_{A}$. My request also includes all the electrotechnical ...
0 votes
1 answer
76 views

How to evaluate motor rating?

I am trying to determine what type of motor to buy that can spin my load at high speeds without overloading it, but really, evaluating this is not my forte. I know this is not sufficient information ...
0 votes
1 answer
66 views

How this synchronous motor works and how to modify them?

I have the following synchronous motor ripped out from an old range hood in my kitchen. I used new electrician tape to cover up the coils that should form the electromagnet--the old cover is too oily....
0 votes
1 answer
44 views

Torque on motor shaft when shaft is rotated manually

The motor shaft is connected to a flywheel which is rotated manually to achieve a certain speed. Now when motor is switched on, how will it impact the shaft? Will motor whole power goes into ...
0 votes
1 answer
437 views

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 ...

1
2 3 4 5
10