# Questions tagged [motors]

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

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### 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
35 views

### What payload can one stepper motor step reliably move / how long does one step take?

My group is making a telescope mount that rotates a payload very slowly, after many gear reductions, to match the motion of the night sky. After our gear reductions we need about a half second between ...
62 views

### Would a pure homopolar DC electric motor be possible by using a partially twisted pair wire?

For the past few days I have been working on a conceptual design of a pure homopolar DC electric motor and I am at a point in which I would like someone to verify if I am correct concerning a key ...
1 vote
234 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 ...
56 views

### 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 ...
180 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 ...
205 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 ...
1 vote
132 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
93 views

### 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 ...
439 views

### Is it legal to have a motor wound with aluminum wire that has the appearance of copper?

Today, I melted some metals for the first time, including some aluminum cans and aluminum parts from my drying machine. I was thrilled to create ingots from them. However, when I tried to make a ...
123 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 with motor-driven massage nubs. There will be a motor that rotates the nub (the part that does the actual massaging) and ...
49 views

### 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 ...
1 vote
269 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 ...
25 views

### So I am building this mechanism and I need to bring the rotation down without changing speed or direction

Just like the Title said I need to move rotation down without changing speed or direction. I can’t use belts because since I will be using a motor, when it stops the belts won’t.
494 views

### How to calculate torque requirement for vehicle with Mecanum wheels?

What changes are specific to mecanum wheels when calculating torque requirements for a vehicle? I have the vehicle's mass, top speed and acceleration data.
43 views

### 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 ...
101 views

### 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 ...
175 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 ...
324 views

### Electric motor for low speed, high torque application?

Background For my mechanical engineering senior design project, we are designing a cargo transporter electric vehicle for off-road conditions. The vehicle needs to transport loads weighing up to about ...
17 views

### Useful power of an induction motor driven at a lower speed

I'm somewhat confused in the physical/mechanical train from the motor to the end load. I have a screw/nut arrangement to move a platform up and down (think about an elevator). Induction motor, pulley ...
112 views

### clockwork motor output in joules formula

I'm trying to understand the output of clockwork coils in joules or watts for different coils. You know the pullback car or windup pocket watch mechanism. I have heard it also called power in the ...
1 vote
3k views

### Running a well pump rated for 230V on 208V power

I have a well with a 1.5 HP pump. The pump is rated for 240V input. At the moment, the only nearby available power is 4-wire 208Y 3phase. I am considering connecting two of the three phases to the ...
11k views

### Type of motor for a small lathe

I am working on a design for a small lathe that could double as a horizontal drilling machine like a Westhoff. My plan is to have specific geared speeds, rather than continuously variable speed. I am ...
114 views

### 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 ...
1 vote
87 views

### 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 ...
1 vote
426 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 ...
29 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 ...
35 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 ...
226 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....
1k 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,...
169 views

### 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 ...
32 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 ...
174 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. ...
42 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 ...
38 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 ...
23 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. ...
108 views

### 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 ...
104 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 ...
99 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 ...
34 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 ...
24 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 ...
839 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 ...
366 views

### 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 ...
532 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 ...
96 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 ...
1 vote
531 views

### How to regulate torque/RPM on an IWD vehicle

Generally, I'm interested in simple (DIY) electric vehicle design problems. I saw some photos of electric vehicles as in the following pic: or also you could check this youtube video. The vehicle is ...
240 views

### 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 ...
759 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 ...