# Tagged Questions

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### How is a synchronous 214 rpm motor for a 50 Hz mains possible?

According to Wikipedia at steady state, [...] the rotation period is exactly equal to an integral number of AC cycles. Now I have a brief description of a three-phase motor designed for 50 Hz AC mains ...
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### wiring a blender motor

So I've salvaged a motor from a blender that was not in use- the only thing is I haven't got a clue how I would wire it. I want to make sure I have the correct setup, since it operates at 230V. So my ...
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### Why did the designer use this motor?

I was taking apart this thing that I bought from the dollar store, its this glass block with an encased sculpture that sits on a revolving deck. (see photo below) The deck powers 4 LEDS with ...
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### Need help on speed control of single phase ac induction motor

I'm working on a project "single phase ac induction motor speed controller". The spec of the motor that im going to use is 230v,1/8hp ,8000rpm@no load I want to know whether it is possible to ...
3k views

### What is the difference between 1-phase and 3-phase motors?

I've read the wiki page on AC motors, but it's still unclear to me as to how they work. I'm looking at motors for a project and need them to be able to have their speed controlled by a light dimmer ...
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### What is the slip factor for an induction generator in an island network?

Most textbooks covering induction machines cover only the motor use-case scenario. When the machine is used as a motor, the slip factor is determined by the frequency of the stator current by the ...
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### Regulating a small clockwork synchronous AC motor

Is it possible to drive a small synchronous motor with permanent magnetized rotor to other speeds it is designed for? I tried to drive a small clockwork AC motor which is symmetrically build but ...
280 views

### DC motor vs AC motor weight considerations

For a given power rating, does a permanent magnet DC motor have a weight advantage over either a three phase permanent magnet synchronous machine, or vice versa? Or does it work out that they would be ...
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### need a circuit that can switch motor direction by photo or timer input

I have a reversible 115 volt ac motor that has its own internal limit switches to cut the power. It has 4 wires to the motor green-ground and red-hot ,black-hot, and white-neutral. If I have the red ...
2k views

### AC fan speed control

I use this fan to cool my room, but sometimes it is too fast and I have to frequenctly turn it on and off to keep normal temperature. Maybe it is possible to reduce the speed by connecting a resistor ...
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### External Accessories for VFD

I am trying to decide what external accessories I need for my VFD 7.5 HP for a 1500Watt Vibrator motor. The three options I have come up with are below. I'm using a standard 220VAC line supply from ...
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### How to slow down a 220V fan? [duplicate]

Possible Duplicates: what do I need to make 230V AC fan spin slower? 220v AC Fan regulator I have an old fan with a relay made for 4 different speeds. Currently, they are all shorted ...
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### What electric motor spec clues indicate easy speed control options?

I'm investigating HVAC fans etc to design my own system and controls, and having fully variable speed control is an important consideration to me. I'm pretty sure there are types of AC motors that ...