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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. ...
My other car is a cadr's user avatar
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0 answers
40 views

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?
Burak Bayan's user avatar
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0 answers
59 views

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 ...
Alex F's user avatar
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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 ...
RSS's user avatar
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0 answers
18 views

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 (...
Simone's user avatar
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0 answers
44 views

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 ...
KingLouis_CLXXII's user avatar
13 votes
3 answers
2k views

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 - ...
15 Volts's user avatar
  • 707
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0 answers
48 views

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'...
embar's user avatar
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0 answers
35 views

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 ...
KnF's user avatar
  • 25
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0 answers
54 views

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 ...
Ayrix's user avatar
  • 101
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2 answers
232 views

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 ...
Root Groves's user avatar
1 vote
1 answer
101 views

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 ...
merendo07's user avatar
1 vote
0 answers
50 views

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....
Ivo Maček's user avatar
1 vote
0 answers
66 views

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 ...
Justin Grant's user avatar
1 vote
1 answer
69 views

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 ...
LEXOR AI's user avatar
  • 346
1 vote
2 answers
174 views

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 ...
Thorin drake's user avatar
0 votes
2 answers
77 views

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 ...
videbar's user avatar
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3 votes
1 answer
144 views

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. ...
geeheeb's user avatar
  • 41
0 votes
1 answer
2k views

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. ...
Sadat Rafi's user avatar
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0 votes
0 answers
100 views

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 ...
WalterPH's user avatar
  • 440
5 votes
2 answers
295 views

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 ...
garvamel's user avatar
0 votes
2 answers
307 views

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?
PigSpdr's user avatar
  • 133
0 votes
0 answers
312 views

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, ...
General X's user avatar
1 vote
1 answer
430 views

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 ...
James Risner's user avatar
2 votes
2 answers
537 views

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. ...
dixhom's user avatar
  • 247
2 votes
1 answer
2k views

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 ...
Samay L's user avatar
  • 21
0 votes
1 answer
714 views

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. ...
Bowman's user avatar
  • 349
0 votes
0 answers
263 views

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 ...
anmnj's user avatar
  • 1
2 votes
2 answers
153 views

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 ...
Tomas's user avatar
  • 91
3 votes
2 answers
538 views

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 ...
Blynx's user avatar
  • 31
3 votes
2 answers
87 views

How to solve application with power spike one time per 24 hour

We have a building where many similar systems run heaters and valves off a 400VAC, 3 phase, 63 ampere supply (45 kW maximum.) Internal control software in each system turn the heaters and valves on ...
Thomas Jam Pedersen's user avatar
0 votes
1 answer
153 views

How to connect Arduino to AC motor

I want to connect from Arduino Uno to AC 1.5 kW single phase motor for my cement mixer project. I was want to try to create a switch on off by using code in Arduino and I was thinking to add several ...
ABDUL HAFIZ MD YUSUP's user avatar
-2 votes
3 answers
369 views

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 ...
King of the Skies 's user avatar
2 votes
3 answers
531 views

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 ...
Vic Belsher's user avatar
0 votes
3 answers
4k views

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 ...
ElectroNoob99's user avatar
2 votes
4 answers
6k views

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 ...
code4cause's user avatar
0 votes
1 answer
81 views

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 ...
Renzo Tapia's user avatar
1 vote
1 answer
75 views

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 ...
user14398375's user avatar
1 vote
0 answers
121 views

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 ...
BigBadBatta's user avatar
0 votes
1 answer
82 views

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 ...
MtZandy's user avatar
  • 25
0 votes
2 answers
681 views

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 ...
Stilez's user avatar
  • 171
6 votes
4 answers
3k views

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 ...
Jean-François Beauchamp's user avatar
0 votes
1 answer
165 views

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 ...
mapapaya's user avatar
4 votes
3 answers
855 views

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 ...
Joeseph123's user avatar
0 votes
1 answer
36 views

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 ...
Joeseph123's user avatar
0 votes
4 answers
4k views

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 ...
grahmW's user avatar
  • 51
1 vote
4 answers
1k views

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,...
plumbum_by's user avatar
0 votes
1 answer
191 views

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 ...
hossein afshar's user avatar
0 votes
2 answers
93 views

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 ...
palako's user avatar
  • 164
1 vote
0 answers
22 views

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. ...
Bob Lane's user avatar