Questions tagged [ac-motor]
For questions about electric motors driven by alternating current (AC).
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What happens if you connect an AC generator to an AC motor? [closed]
An AC generator (or alternator) converts mechanical energy into electrical energy. An AC motor does the reverse.
What would happen if we connect the two in such a way that the output rotational ...
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3
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Mystery small, electric motor: shaft held stationary while motor spins around it
I want to wire this motor to a 3-pin plug. The colors are not standard. Which of these wires is neutral, active and earth.
It would be of interest to know what this kind of motor is called?
I was ...
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3
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Is it OK to reduce fan speed by reducing voltage?
I have this air cooler whose speed is just too much even on the lowest speed setting, so I added one more speed controller(or regulator) in series which is basically used to control the ceiling fan ...
2
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4
answers
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Trying to understand this electrical diagram schematic on an AC motor that I have, particularly symbol between yellow and black wires
I'm new to electrical wiring and I'm trying to learn a bit and came across this AC motor which I have that isn't hooked up. I have attached the motor wiring diagram:
This is also the wiring ...
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1
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Why AC motor driver shorts out?
I have been working in a VFD using an AC motor driver FSBB30CH60DF and making control of it using a dspic30f4011. As you can see in the attached circuit schematic, the mains supply is a single phase ...
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Oversized electrical motor, synchronous, vs asynchronous
I know that a oversized motor would consume more energy than a well sized one, and in a low load scenario it will present a lower power factor than a well-sized one too. My question is, what is the ...
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Can this blown component be identified?
I was repurposing a universal motor from a blender for a home project. Unfortunately a screw went through a wire and shorted to ground. Many components are damaged. I'm assuming the motor is fine. The ...
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1
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Doubts regarding relays
I post this question asking for advice. I am working on a personal project for my garden and I want to automatize a water supply system, more specifically a 1/2 HP water pump and a motor. Both work ...
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How to prevent an electrical motor surge from repeatedly blowing the fuse when it stalls?
So, this is something that I shouldn't need to do, but I do. As far as I understand, it should be trivial, bit I'm hazy on the details.
I have a 2kW mains AC power tool with a rotary output. Its ...
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3
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Single phase 3-speed AC motor won't start spinning or spins in wrong direction
I have a Danby DPAC8399 air conditioner, and its fan motor started acting strangely. Sometimes, it it will only do a hum and won't start, and other times it will do that hum for a few seconds and then ...
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answer
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Are there any 20v to 240v step up transformers in the market? [closed]
I'm constructing a AC motor driver for a project that will take in a DC voltage source and output an AC voltage fit for an AC-motor. I didn't have prior experience with power electronics or power ...
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Induction Motor Wire Size
Capacitor Run Single Phase Induction Motor have very high starting currents, possibly in the order of 35-40 Amps upon startup for a 1 hp device, whereas the nominal current usually lies in the order ...
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SPIM Rated Torque
What determines the rated torque of an induction motor? Is it purely limited to max continuous current adherent to heat dissipation requirements, or is there more to it? From what I understand, motors ...
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4
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851
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How to combine wall outlets for higher amperage?
I have a large single phase AC motor that draws 30 amps at 125v. I only have access to NEMA 5-15R outlets (which are rated for 15 amps). However, several outlets are on different lines (different ...
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AC Synchronous motor control circuit
What is the best way to drive AC synchronous motor?
I have AC motor like this:
If I connect mains to 0 and 1 terminal it drives CW, if to 2 and 0 - CCW. In my project I have MCU that will drive motor,...
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1
answer
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control ac motor with SCR
I want to repair the circuit of a Mixer that used the TS820 thyristor.
The other components were healthy except the thyristor so I replaced the TS820 with the BT151 but the circuit did not work.
Now I ...
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2
answers
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Valve motor seems to stall to open. Does this make sense?
This is the scenario: There's a valve controlled by what it looks to be an AC motor, specified as 220V 50Hz and 7W. That's all, there's no datasheet available and there's nothing else on the labels ...
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Reconnecting a rewound 110vac motor to power
Motor is (about) 5hp 110vac and powers a a table saw.
Motor was recently rewound but previous owner did not reconnect to the power cord.
There are no info plates on the motor to help w/ reconnecting.
...
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What is the net magnetic flux density in the center of a four-pole stator and other multiple-pole stator?
According to this ppt,
if the currents are given as
$$\left\{
\begin{aligned}
i_{aa'}=I_M\sin{(\omega t)} \\
i_{bb'}=I_M\sin{(\omega t-120°)} \\
i_{cc'}=I_M\sin{(\omega t-240°)} \\
\end{aligned}
\...
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Which type of motor use in oil-free air compressor? And how to detect stall?
I got 220V AC single-phase air compressor which labeled "Oil-free" and it look like this.
Some time the motor fail to start and got smoke out. (Some people says that happen when start motor ...
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1
answer
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Need help designing a hairdryer
I'm designing a hairdryer as project for a university class, but I'm having trouble regarding the choice of the motor. I need it to have two possible speeds. My first idea was to use an AC motor and a ...
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Why can't I change the speed of an ininduction motor by changing the voltage?
Given a three-phase asynchronous AC motor ("induction motor"), I tried figuring out whether lowering speed / torque by lowering the supply voltage should work, similarly to how it works with ...
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Effect of PWM output from Variable Frequency Drive to PSC motor
I looked at VFD diagram and seem like it use Sine-PWM Output without any filter to drive psc single phase ac motor
Inductance and capacitance seem to work with pure sine wave but PWM output have a lot ...
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Space vector and bias voltage
I am trying to learn the space vector modulation but I am wondering how is the bias voltage in a 3-phase system regarded by the space vector?
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Multimeter and clamp give different AC current measurement
I am trying to measure the power output of an AC permanent magnet motor to a load (a resistor). To do this, I am measuring the current through the resistor, and the voltage across the resistor. To ...
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Working of an electric motor [closed]
Do motors run on an Ac source? If it does then do we need to convert ac into dc before supplying it to the motor?
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How to increase the power of an electric motor?
What's the difference between a 1HP and 2HP electric motor?
Slightly different dimensions:
They look almost identical:
Here are the specs:
Same top speed (RPM). Same Voltage. Difference in current ...
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How to wire a single phase, 3 wire motor?
So i bought a motor off of kijiji, it was an old furnace motor. I am trying to build a flat lapidary machine and use this motor to power it. However, there is no wiring diagram on the motor anywhere ...
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3
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I removed a little motor from my laptop fan and it won't run using a 9V battery
I realize this is may be a noob question so please point me to the right place to ask it if this isn't so. Anyway, I'm trying to build a little magnetic blender using a spare laptop fan. I tried ...
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Old Record Player Motor Doesn't Have Torque To Start
I am restoring a jukebox from 1953 (AMI E-120). Everything is going fine except the main drive motor, an A/C induction motor, cannot start under the load of the platter. It starts fine when the ...
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Need help identifying wires on 3-phase single-volt AC motor (6 leads)
I'm far from an electrician. Just a guy trying to get some new life out of an existing piece of machinery.
See the image below, this 5HP motor comes from a heavy duty commercial treadmill. Based on ...
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Using thermistor vs. soft starter for motor
What is the advantage that complex soft starters give over NTC thermistors if one is only trying to get rid of inrush current spikes?
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Controlling AC motor with relay vs. switch on motor
Is there a difference in terms of operation between switching a relay connected to mains for an AC motor versus opening/closing a switch on the motor? Would the internal protection circuitry ...
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Electrical Motors and Frequency
I was musing about electric motors after seeing one randomly on TV, and there's something I'm must be remembering incorrectly.
It's just a thought experiment, so I'm imagining some theoretical DC ...
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Speed Controlling an AC motor
Hello I have an AC motor that i want to make a speed controller to, but before i start i want to make sure that it is possible with the type of motor i have. I do not want to waste the motor ...
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How to distinguish a DC generator from an AC generator
I have an electrical generator (a tachometer really) and I want to know how can one detect if it is AC or DC? (what if it is dead and can not be tested for its output?)
I add the image if some of you ...
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Universal Motor as a magnetic brake
Hello friends of stackexchange,
I want to make a magnetic brake based on a universal motor from a Candy wash machine TYPE 20584.528. I suppose that the best way is to use the motor as a DC generator ...
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Why do some motors have high rpm while other have low even though having same power consumption
I have seen a 500w motor which run on 1200 rpm but a 300w motor with over 10000rpm . I know using a gearbox can give required rpm or torque and torque is inversely proportion to speed but how can I ...
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"Digital Clutch" For Electric Motor
I am in the design phase of a piece of machinery that needs a "Digital Clutch."
Requirements of the project:
Machine must run at several different constant RPM settings.
Machine needs to ability ...
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What does "Brushless DC is an AC induction motor with built-in speed feedback" mean?
I found a quote
which states that:
"Brushless DC" is a marketing term for "AC induction motor with built-in speed feedback."
Is it correct? What is "built-in speed feedback?"
I found a decent ...
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Why do Tesla and other manufacturers use AC motors? [duplicate]
I know Tesla and others use AC motors. I read a lot and no one really provides a good answer. I know they are using an AC induction motor, and with Model 3 also an AC synchronous permanent magnet ...
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Reversing direction of an AC universal motor
The problem: I have a table saw motor I am trying to use in a jointer and need it to spin in the opposite direction (permanently). I have had trouble finding an answer that I am reasonably sure ...
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