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6 votes
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Why this motor shows delta 220 / star 380 which is usually the other way round from what I know?

You're mistaken. The motor phase voltage is 220 V. When connected in star, the line voltage is 220 * √3 = 380V. When connected in delta, the line voltage is the same as the phase voltage i.e. 220 V.
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4 votes
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Multimeter shows voltage on metal cage of my new Standing Fan!

I'm assuming you measured voltage between the chassis and Earth from a nearby socket. If you put one probe on the fan and the other somewhere else that isn't Earth, then you're not measuring voltage ...
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4 votes

Bootstrap circuit for electromagnet drive or sense?

simulate this circuit – Schematic created using CircuitLab This is a typical PWM drive for a relay or valve, but the catch diode D1 can be decoupled from the coil by M2 and M3. During PWM the ...
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  • 1,889
3 votes

What should I do with the neutral line while running 3-Phase induction motor?

N is not used from the source in a Squirrel Cage Motor (SCM) . Rather a 3P2T transfer switch is used only from the 3Ph Delta source to boost the voltage per windings in Star Mode with <50% rated ...
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2 votes

Energized motor driven in opposite direction?

Such a system you are describing above is commonly referred to as a Series Elastic Actuator (SEA). The motors are not perfect torque sources. Motors with permanent magnets have cogging torque, which ...
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2 votes

Energized motor driven in opposite direction?

Will the spring be able to drive the motor in the opposite direction? Yes it will. Consider the scenario where the voltage is removed completely. Assuming no frictional or stiction, the motor shaft ...
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2 votes
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How to properly start an induction motor using a variable frequency drive?

If the motor is not spinning, then from zero hertz or cycles per second. If the motor is spinning, this is termed "catching" it and some VFD's can do this and some cannot. Check the feature ...
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2 votes
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What should I do with the neutral line while running 3-Phase induction motor?

As far as I know, the output of the distribution transformer (11 kV Delta / 440 Wye) sometimes gets unbalanced. That would be a very good reason not to connect the motor star / wye point to neutral. ...
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1 vote

How to properly start an induction motor using a variable frequency drive?

I am currently working on a "simple" DIY VFD design, and have had some success in being able to start and run a small three phase induction motor at frequencies from 10 Hz to 90 Hz. ...
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1 vote

What kind of motor is needed to make this work?

It's a brushed permanent magnet DC motor, It will need to spin quite fast to make enough voltage to light an LED. much more than the approximately 1000RPM seen in the video
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1 vote
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What kind of motor is needed to make this work?

Almost any permanent magnet, brush-type DC motor (one having a commutator) should work as a generator. Don't use a brushless motor, as found in computer fans. Motors from an inexpensive battery-...
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1 vote

How to limit current to a DC motor. (using Arduino and BTS7960)

You're probably seeing the starting surge of the motor, which can be several times the running current. You've already got an Arduino and the BTS7960 has a PWM input, so try ramping up the current ...
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1 vote

Armature Winding

why aren't armature windings usually done in a simple manner.... If you had one armature winding with two commutator segments (as per the above picture), the motor might not spin at all when the coil ...
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