Questions tagged [ac-motor]

For questions about electric motors driven by alternating current (AC).

Filter by
Sorted by
Tagged with
-2 votes
3 answers
94 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 ...
user avatar
2 votes
3 answers
142 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 ...
user avatar
0 votes
3 answers
90 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 ...
user avatar
2 votes
4 answers
741 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 ...
user avatar
0 votes
1 answer
76 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 ...
user avatar
1 vote
1 answer
46 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 ...
user avatar
1 vote
0 answers
94 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 ...
user avatar
0 votes
1 answer
68 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 ...
user avatar
  • 25
0 votes
2 answers
86 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 ...
user avatar
  • 171
6 votes
3 answers
985 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 ...
user avatar
0 votes
1 answer
79 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 ...
user avatar
3 votes
3 answers
112 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 ...
user avatar
0 votes
1 answer
29 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 ...
user avatar
0 votes
4 answers
851 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 ...
user avatar
  • 21
0 votes
3 answers
285 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,...
user avatar
0 votes
1 answer
74 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 ...
user avatar
0 votes
2 answers
48 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 ...
user avatar
  • 164
1 vote
0 answers
21 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. ...
user avatar
0 votes
0 answers
30 views

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} \...
user avatar
  • 1
0 votes
1 answer
54 views

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 ...
user avatar
  • 952
2 votes
1 answer
175 views

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 ...
user avatar
  • 23
0 votes
1 answer
125 views

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 ...
user avatar
0 votes
0 answers
46 views

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 ...
user avatar
  • 952
0 votes
0 answers
30 views

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?
user avatar
2 votes
0 answers
100 views

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 ...
user avatar
  • 21
0 votes
5 answers
93 views

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?
user avatar
  • 101
0 votes
3 answers
3k views

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 ...
user avatar
  • 1,009
0 votes
0 answers
101 views

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 ...
user avatar
0 votes
3 answers
146 views

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 ...
user avatar
  • 103
4 votes
1 answer
368 views

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 ...
user avatar
  • 141
2 votes
4 answers
4k views

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 ...
user avatar
0 votes
3 answers
483 views

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?
user avatar
  • 41
1 vote
2 answers
88 views

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 ...
user avatar
  • 41
3 votes
4 answers
939 views

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 ...
user avatar
0 votes
2 answers
151 views

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 ...
user avatar
  • 557
2 votes
4 answers
75 views

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 ...
user avatar
0 votes
1 answer
131 views

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 ...
user avatar
  • 11
0 votes
2 answers
1k views

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 ...
user avatar
0 votes
2 answers
105 views

"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 ...
user avatar
2 votes
2 answers
547 views

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 ...
user avatar
  • 55
0 votes
3 answers
592 views

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 ...
user avatar
3 votes
1 answer
10k views

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 ...
user avatar
  • 33