4 votes

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

All wires used to wind coils for motors must be insulated so adjacent loops of wire do not short-circuit themselves. For some reason the most common form of wire insulation enamel is orange/red in ...
niels nielsen's user avatar
3 votes
Accepted

Will this pulley system work?

Yes. If the motor moves to the right by distance $x$ then the inner left pulley most move the same distance. This will increase the length of the fixed end by $x$ and the length of the top left ...
Transistor's user avatar
  • 10.7k
2 votes
Accepted

What are the issues with using a general purpose motor on a variable frequency drive?

In my experience there are three main failure modes for motors on a VFD. These modes of failure are more likely when the motor is not rated "Inverter Duty". However note that when used ...
ericnutsch's user avatar
  • 8,146
2 votes
Accepted

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

Those contain the start capacitors that are needed in single-phase electric motors to get the armature spinning when the motor is first turned on. The start capacitor is connected to the AC mains and ...
niels nielsen's user avatar
2 votes

Impact of generator start-up on its health

Startup wear in internal combustion engines happens mostly because the engine is turning before the oil pump has had a chance to develop full pressure and move oil to all the moving parts of the ...
niels nielsen's user avatar
2 votes

How do AC servos have constant torque region?

I was always taught that there is a linear relationship between torque and speed. Only for permanent magnet brushed DC motors. Other types of motors have other curves. Technically, even raw brushless ...
DKNguyen's user avatar
  • 5,626
2 votes

How to compensate for the activation torque of a harmonic drive

I am going to assume that by "activation torque" you mean some combination of static and Coulombic friction. Both of these effects tend to defeat linear controllers like a straight PID ...
TimWescott's user avatar
  • 2,662
1 vote

Force and motor calculation on a moving chain sprocket system

If the sprocket is geared to a vertical track and rolls up on it while turning then the distance from the center of rotation as relates to torque is the diameter of the sprocket, not its radius. ...
kamran's user avatar
  • 22.4k
1 vote

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

You did not say whether your motor was brushed or brushless. Sensorless DC brushless motors drivers routinely do this with their back EMF sensing which they need for commutation anyways. In brushless ...
DKNguyen's user avatar
  • 5,626
1 vote

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

From the comments (but should be in the question!): The motor is going to be positioned vertically. So the weight of the table (up to 15kg) will be directed axially, which is why i don't trust gear/...
Transistor's user avatar
  • 10.7k
1 vote

How to balance an irregular shape on a motor shaft?

The high school science method is to hang your object from two random points and mark the vertical plumb lines, the intersection of the two lines is the CG. There are a vast number of different types ...
kamran's user avatar
  • 22.4k
1 vote

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

Companies such as Crouzet make small synchronous motors with gearboxes. I would consider, Putting a small gear wheel onto the gearbox shaft. Getting someone with a laser cutter to create an acrylic ...
Transistor's user avatar
  • 10.7k
1 vote

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

Someone asked for something similar before and one difficult requirement which they listed that you did not, but I am almost certain you have, is noise. That rules out small, heavily geared motors. ...
DKNguyen's user avatar
  • 5,626
1 vote

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

It looks fairly straight-forward. We can see that there are three main modes in the chart: standby (low power), motor start and motor run. My guess is that in standby there is an air distribution fan ...
Transistor's user avatar
  • 10.7k
1 vote

Mechanism to engage and disengage a motor shaft

I would run the string over a roller-lever microswitch to detect string tension. This is the same principle of operation as many "dancer-controlled" unwind systems used in industrial ...
Transistor's user avatar
  • 10.7k
1 vote

Remove slack from geared stepper - without touching the gearbox?

The problem you are describing (rotary play) is also known as "backlash". There are several approaches to a solution but you could investigate backlash compensation which includes techniques ...
Transistor's user avatar
  • 10.7k
1 vote

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

Not illegal. Aluminium is lighter and almost as conductive as copper. Makes economic sense to use aluminium for lighter and cheaper motors.
Rhodie's user avatar
  • 964
1 vote
Accepted

Worm drive vs Cycloidal Drive

Your question is so open ended that its hard to answer. But lets try. The reason is almost certainly cost, manufacturing capability and legacy reasons. A worm gear is very easy to make in volume. This ...
joojaa's user avatar
  • 3,587
1 vote
Accepted

Method to achieve a constant force no matter the actual velocity when under load

If the changes are slow enough, a simple pulley with counterweight might do the job. Constant force hangers are used very commonly for piping, where you can find interesting designs using combinations ...
Tomáš Létal's user avatar
1 vote

Flywheel power vs. Gross power in bulldozers

I don't have those specifications available to me, but each one is a measure of horsepower with different stuff attached to the engine. I.e., "Gross" horsepower is probably an engine on a ...
TimWescott's user avatar
  • 2,662

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