Questions tagged [ac-motor]
For questions about electric motors driven by alternating current (AC).
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Is it possible to use just two SPDT relays to control this AC motor?
I purchased an inexpensive electric hoist off Amazon with the intention of partially replacing its control circuits so that it can controlled via ESPhome.
There are only 2 buttons on the control box. ...
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AC Motor Control with TRIAC
I want to drive an AC motor using a TRIAC. I am new to this topic. I built this circuit and found that it is not working. What could be the reasons for this?
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What parameters give unlinear torque model of induction motor?
I want to realize factors which give nonlinear model of torque toward speed with power consumption in induction motor.
I tried find math model induction motor. But usually, I had same charts:
As we ...
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Can I run a one-phase AC capacitor motor from a three-phase VFD?
I'm building an art installation and found a cheap but strong AC Motor with capacitor. So by my understanding it is a one-phase capacitor run motor. The shield with the specs is very old and hardly ...
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Impact of Low Power Factor on Loss Generation in PMSMs
I am focusing on the losses generation in PMSMs and still have some doubts about the role of a low power factor.
For the analysis, I consider a three-phase PMSM controlled with Field Oriented Control (...
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Wiring AC 5 Wire Motor with 4 Phases to Run at Max
I'm trying to hardwire a fan motor to always run on max. Currently, it has a circuit board that allows you to adjust the speeds and requires a bit of fiddling to turn on and set the speed when the fan ...
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Why does a motor or ceiling fan exhibits low torque after capacitor-to-inductor swap?
For quite some time, I have been curious about what would happen if I replaced the capacitor in my ceiling fan with an inductor. Here in India, we usually deal with a mains voltage of about 220 - ...
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Variable speed drive for an alternating current motor with PIC18F4431
I'm designing a control board for a three-phase motor speed controller using a PIC18F4431. I've used an inverter powered by 24V DC to convert the voltage to 24V AC to power the motor. Additionally, I'...
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TRIAC Controlled Motor circuit: PWM logic doubt
I'm working on the logic board of my kitchen air extractor. I wanted to "hijack" the controls (physical buttons) to be able to control those with an ESP8266. While I was analyzing the ...
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Why is there no torque in electric motors when the Iq current is zero and Id current is not zero?
Random vector position of stator current ( Id + Iq = Is ):
Now I draw the stator current/flux vector as shown below where “Iq = 0” and “Id ≠ 0”:
From lecture I’ve learned that the south pole of the ...
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Using tunnel diode to cancel out armature resistance
Can we use tunnel diodes to cancel out armature resistance?
A tunnel diode when it is in its negative differential region under DC shifted AC(AC with some DC offset) and if the Vp-p of the AC is very ...
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Slowing down a synchronous AC motor
I'd like to slow down the little AC motor, which drives the mechanical controls on my washing machine (yes it's ancient but it works just fine). The wash cycle is a bit short, and I'd like to make it ...
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Identifying old capacitor
I need help identifying the capacitor that needs to be replaced. The capacitor was located in the motor of the sewing machine. It is not clear in the pictures, but it says:
.01 + .0005 x 2 and 600WV....
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How can 120V fail to spin an AC motor that spins fine with 120V on a different power source?
While troubleshooting a home appliance, I found something odd: a 120V AC refrigerator fan stopped spinning despite being connected to 120V AC voltage (verified with my multimeter) inside the ...
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Why does my food mixer have voltage across input cable leads even when unplugged?
I have a technical problem where the cable of a food mixer has voltage across its cable when unplugged. When I measure it with a multimeter at various times after being unplugged it shows a voltage ...
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Coil winding direction in a shaded-pole motor (4-pole)
I have rewound a shaded-pole motor (4-pole).
It's wound around the stator in a clockwise motion and around each coil in a counter clockwise motion.
Is the winding being incorrect the reason why the ...
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Did I wire this AC motor properly?
I disassembled a drill to replace the chuck and when putting it back together it seems to be short-circuiting. I have doubled check the cables but they seem to be ok, so I'm afraid I may have wired it ...
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Pump motor fails to start when connected to a low frequency inverter via a long wire [closed]
I've been struggling with a submersible pump showing unreliable behaviour when connected through a long cable to a low frequency inverter.
The pump is used only once a week to fill up 3 5000 L tanks. ...
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How does this single phase induction motor run without capacitor?
The motor of the picture has no facility to connect capacitor. The phase and neutral is directly connected to winding. It works fine on 220 volt 50 Hz AC. Although performance get poor at 190 volts.
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What type of single-phase motors can I control using a frequency inverter?
I have a single phase fan, and I want to control the speed of this fan so it occurred to me to design a VFD for this purpose, but I was researching more about single phase AC motors and I read that ...
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Help with (very) odd single phase motor wiring
I think this is my first post here.
I have little knowledge on AC motors, and this machine I am servicing (an old Balltrap/Clay target shooting machine) left me baffled. The below diagram is a ...
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Do modern variable frequency drives perform power factor correction?
Do modern variable frequency drives (VFDs) perform power factor correction?
I can't find info to see whether VFDs do power factor correction. If they do, how good are they?
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AC motor speed control circuit
I connected a circuit found on the internet:
Results:
When the AC motor is connected to the closed circuit, it did turn on, but the speed of the motor keeps increasing on its own without turning off, ...
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Wish to understand an AC motor electrical diagram schematic to safely connect a capacitor and switch
I have this motor (Samsung Electronics SMV-260UA) diagram and a 10 μF capacitor from a salvaged microwave:
I've experimented with supplying power, but I need start up current to kick the motor into ...
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How to control the speed of an AC motor with DC voltage programmatically?
What I want to achieve
To control the speed of an AC motor with DC voltage programmatically with Raspberry Pi.
I asked on Raspberry Pi.SE and was told it was an EE question, so I'm asking here.
...
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How can I properly convert two phase AC supply to three phase using capacitors?
I have an AC 3 phase delta connected submersible induction motor with specifications 440 V, 10.5 A, 5 HP, 2800 RPM which is already fitted with a 3 phase PF correcting capacitor in parallel. The ...
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Speed controlling of AC motor with dimmer
I have a fan which has asynchronous motor. It's features are that 230V AC, 50 Hz, 50W. I want to control it's speed using AC dimmer. I can control the brightness of light bulb with my dimmer circuit. ...
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Why do BLDC motors require feedback, whereas AC motors do not?
I was delving into the functional difference between 3-phase AC motors and 3-phase BLDC motors, and was wondering what would happen if a BLDC motor was run without feedback to its controller.
I found ...
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Can we run an induction motor by sequentially applying DC voltage to the windings of stator?
We know that in induction motors, 3-phase AC input is applied to 3 windings of stator in order to generate changing magnetic flux in the rotor. What would happen if we apply 3 DC voltages ...
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Does current have to return to its source?
I am not the most knowledgeable when it comes to electricity, so apologies if my questions lacks necessary information that is needed to get a good answer.
I work with 3 phase electric motors, and I ...
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