Questions tagged [single-phase]

AC power with two legs run 180 degrees out of phase

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1answer
53 views

Understanding Per Unit System

I am having issues understanding the Per-Unit System calculation. I don't come from an exact power engineering background so I hope my question is not too stupid. For the calculation of base ...
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0answers
57 views

Two transistor pair inverter and one transistor pair inverter

Today I made DIY inverter (the top one) I managed to achieve ~2 volts from 5V usb, everything seemed to be ok. But I have question - is this the right way to make inverter? I also found the bottom ...
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4answers
60 views

Phase and voltage conversion

I have a hypothetical question in regards to phase conversion and transformers, more specifically on their combination. I am not a certified electrician or engineer, so I don't know what all goes into ...
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2answers
47 views

What can be the consequences of a smaller airgap in a induction motor for the efficiency and rotor current?

Last year I bought 3 motors from a junkyward, and one of them was a 1/4 hp, 4 pole single-phase induction motor made by WEG for an Electrolux washing machine. Or at least it was supposed to be, cause ...
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1answer
12 views

Testing a 3-phase ev charger on an 1-3 frequency regulator

Im currently working in an office environment developing a system to communicate over rs485 Modbus with an 3 phase EV charger. Due to the location it is not possible to get three phase power. However ...
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1answer
37 views

What should be the phase difference in the two windings of a split-phase induction motor?

I'm having a little basic problem here. I'm trying to reconnect the coils of a 4 pole motor (concentric winding) to make a 2 pole motor. I've managed to make it work in 2 configurations so far (in two ...
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3answers
106 views

Two-phase system for a smart house?

First I apologize for my ignorance regarding electrical matters. I am analyzing a dataset from a smart house. Some of the power measurements are divided into phase A and B. Their values are somewhat ...
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1answer
53 views

Why 2 pole induction motors don't use auxiliary windings while running (while others do)?

Most motors with more than 2 poles I see (4 poles, 6 poles etc) use a run capacitor and a use the auxiliary winding all the time. Some even employ starting capacitors but they always have a run ...
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88 views

Using three phase contactor with single phase motor

If using a contactor for 3 phase motors with a single phase motor, can just the hot (120v) line be passed through the contactor, with the neutral and ground bypassing it? I believed the concept for ...
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43 views

Unsure if motor starter (contactor + overload) is needed instead of normal solid state relay

I am designing a system with several pumps ranging from 0.5 to 1.5 HP (all single phase) and am unsure of what kind of circuitry I need. I researched different motor contactors and overloads I could ...
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1answer
101 views

Wiring a single phase electric motor with a run and start capacitor

I have a single phase electric motor provided with the following wiring diagram. The wiring diagram unfortunately omits the active line and neutral connection details. I've had a look at several other ...
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1answer
54 views

Single and 3-Phase Load Calculations

I have a probably obvious question about powering single phase loads from two legs of a 3 phase supply and how this impacts current draw calculations. This is something that is commonly done in my job ...
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39 views

Which one is the real single phase two wire circuit?

Which one is the real single phase two wire \$(1\phi2w)\$ circuit? i have seem these two type,and both of them were be written in some books Type A: https://slideplayer.com/slide/5867350/ 0:35 in ...
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1answer
65 views

welling yxb-250-4 induction motor spin start direction is inconsistent

This motor is also often referenced as W11283592. The best pictures of it are in http://www.gmcc-welling.com/Homeen/Product/detail/id/187.html and https://partsdr.com/part/w11283592-drive-motor. The ...
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2answers
48 views

Will this 3-phase 208Y/120 setup work [closed]

OKAY...electrician I had out recommended the following setup to supply 3-phase wye 208/120v off of 240V single-phase. My device is pulling 30 amps, and my entire load is about 15KVA. It's impossible ...
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2answers
88 views

Converting single-phase 120 V or 240 V into three-phase 4-wire 120/208 V

I am needing to convert either 240 V or 120 V single-phase into 120/208 V three-phase 4-wire. The load needed is 30 A. My panel can supply up to 100 amps, so the amperage isn't an issue. I've looked ...
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71 views

Single phase neutral current & three-phase neutral current with respect to kirchhoff's law

In the below schematic, would be the sum of all current in the single phase neutral wires equal to the current in neutral wire going to the 3 phase main disconnect? In theory, we know that if the 3 ...
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0answers
759 views

I have a AC motor with 3 wires. Black, red and white. How can i connect the capacitor and to power supply as shown on the diagram?

Please help me to understand the diagram attached. I have a motor with three wires. Black, Red, White. and a Capacitor with 2 wires(both Black). 1. How to connect the capacitor to the motor 2. How ...
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1answer
210 views

DIY Single phase transformer to split phase

I am not changing voltage, just splitting the phase. Would this work? 240V single phase to 240V split phase 21 windings on the primary 21 Windings on the secondary Center tap the 11th for N Primary ...
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3answers
130 views

Wire size & current capacity

I recently came across with the catalogue where the wire sizes and their specifications are listed. In that, there was a specification "current carrying capacity - 2 wires single phase". What does ...
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1answer
115 views

How to convert output from a split phase inverter to single phase with only 1 hot?

Here in USA, we use split phase 240VAC 60Hz. In Philippines, they use single phase 220VAC also 60Hz. How do I make an inverter designed for 240VAC split phase output work properly over there in ...
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3answers
2k views

Why is the three-phase voltage 440V, if single-phase alone is 230V?

Why it is not 230V ×3, why only 440V?
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2answers
4k views

Can I hook up a single phase switch to an electric wood splitter? [closed]

Good day. I have a 5 ton Yardmax electric wood splitter that I would like to add a single pole foot pedal switch. Right know there is a Kedu HY56 switch built in. The motor has 4 wires (2 blue, 2 red)....
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1answer
96 views

Electrical wiring help - generator

I'm trying to replace a regulator for a single phase generator. There is a symbol I don't understand. What does this symbol mean? Full diagram:
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2answers
46 views

L and N switched, from a functional point of view, what difference does it make for the device being powered?

Consider a generic single phase AC 240 V (or 125V) device for home use such as a hair dryer. From a purely functional point of view, what difference does it make if a phase is switched with the ...
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0answers
85 views

Calculating the value of current-limiting reactor in single phase dual converter

I'm having a problem calculating the reactor's value in single phase dual converter. As you may know, the reactor shown in the picture below is to limit circulating current caused by the voltage ...
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0answers
31 views

Calculating speed of the rotor with slip

The question i'm having trouble with is: Calculate the speed of the rotor of a 6 pole induction motor with a slip of 2.2%. The motor is connected to a 230V single-phase supply. I am familiar with ...
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3answers
878 views

Controlling the speed of a single speed AC exhaust fan motor

I have this single speed exhaust fan: 30" Exhaust Fan with Shutter - Direct Drive - 1/4 HP - Single Speed. When it's running it's way faster and louder than I'd like it to be. So I'm trying figure ...
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2answers
609 views

Does only wiring 2 poles of a 3 pole overload relay have any effect?

When wiring a single phase starter, they tend to jumper the overload such that all phases of the overload are used. Now, considering that the overload has 3 separate bimetal strips all connected to ...
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1answer
53 views

Converting single-phase to three-phase for City & Guilds 2391 practical

For my City and Guilds 2391 course, I will be testing a three-phase distribution board with a motor and single-phase sub-main. I am finding it hard to memorize the test procedures. So for me it's ...
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1answer
420 views

connecting single phase motor to UK mains AC

I have a single phase single volt (UK 220-240) 1Hp electric motor with two capacitors, start and run. As photographed. This is to run my Milling machine. I need to connect the motor, via ...
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1answer
32 views

Loading one line from Three Phase Power Delta Configuration

I have been trying to determine whether or not I can run one line from 3-phase power into a power conditioner that requires single-phase input. The current draw on this line would be around 10 A. ...
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1answer
34 views

Calculating reactive power on kVAr?

I think I understand how to answer this question but am missing how to do a certain part which stops me from getting their. For this question this is all I know how to do. cos-1(0.31) = 71.94° ...
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2answers
51 views

Understanding the failure mechanism of capacitor

Most ceiling fans and table fans designed for household use, eventually slows down before completely failing to work. By close observations I found these fans are using capacitor-split-phase motor ...
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1answer
415 views

wiring electric motor to run CW without name plate or diagram information, other than my diagram of it running CCW

Motor does not have name plate or diagram. It is running CCW rotation now. From my wiring diagram is it possible to re-wire to run CW? Thanks for your help.
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1answer
398 views

An overseas company is making a machine for me and they need to know whether I want 1,2 or 3 phase and what voltage

I'm in Quebec and the company making the machine is in China. The machine is an industrial sized T-Shirt sublimation machine that does two sided printing. So there's a large heated plate that is ...
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1answer
364 views

Transformer Sizing with Mixed Loads (Three-Phase & Single-Phase)

I am trying to size/validate the rating on the medium voltage main transformer for an industrial plant. For some reason I can't find many resources that indicate how to properly do this when you have ...
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1answer
39 views

Can AC voltage phase change across an SSR?

I got an SSR (Picker PCS15-D-240A-25ZL) to control a single phase 240VAC North American circuit going to a heating element on a homebrew setup. One of the load wires goes through the SSR and the other ...
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0answers
461 views

How to identify and wire leads on a one phase 6 lead, capacitor start, capacitor run electric motor

The leads are labeled U1, U2, U5, U6, Z1, and Z2. My research has found wiring diagrams on 4 lead motors where U1 & U2 are main winding and Z1 & Z2 are auxilary winding. Start capacitor wired ...
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744 views

2 pole single phase induction motor appears to have starting capacitor permanently connected (no centrifugal switch)

I am trying to repair and rewire an AC induction motor from a small compressor. From what I can tell it's a 24 slot, 2 pole single phase induction motor that has main coil and starting coil. The ...
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1answer
242 views

Capstone PCB for a Single phase power energy meter

I am an EE major in the process of working on my capstone project of developing a PCB of a Single phase power energy meter and I need help scrutinizing it. I Intend to interface this circuit with my ...
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3answers
9k views

How to connect this 3 wire AC motor?

I have this NEW heat recovery unit from Amazon (shady quality, branded as made in UK but actually made in China) with this motor inside. It was supposed to have two speeds (Low/Hi). Question: How ...
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3answers
161 views

What enables the home appliances and electronics to work on single-phase?

Talking about the home appliances and electronics, if it is single phase that we are using in houses and currents get to zero every half cycle, how do the home appliances (using AC) and electronics (...
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2answers
673 views

What will happen if we use an Inductor in place of a Capacitor in Single phase Induction motor

So as the titles says, well i know that a capacitor give phase shift and that results in a rotating Magnetic Field. So i was wondering what will happen if we use a an inductor, i mean doesn't it ...
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3answers
218 views

Why are the diodes in this circuit forward biased in spite of no current flowing through them?

Considering the following circuit, Normally in the +ve half cycle SCR1 is triggered after it takes its triggering gate pulse and then D2 becomes intrinsically forward biased so it's on and conducting ...
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2answers
76 views

Little torque of single phase asynchronous motor

I have a single phase asynchronous motor rated 230V, 500W. It has three terminals labeled U, V, W. I connected L1 to U and N to V (other way round makes no difference though). Between V and W is a ...
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0answers
77 views

Is there a cost savings associated with 3 phase power at the same device power requirement (kW)?

I am a Mechanical Engineer looking into purchasing an annealing furnace and have seen that some operate on single phase power while some operate on 3 phase power. I've done some research and have seen ...
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1answer
1k views

single phase 120V convert to 3 phase 208V

Can you convert 1-phase 120V into 3-phase 208V? If yes, whats the simplest way to do that?
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2answers
888 views

Ceiling Fan Speed Control stripped down

I am a novice but know enough to get by. I was given an older Hunter Fan that is only operated via Remote. I have cut the receiver out because I do not have the remote and from what I have read they ...
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1answer
343 views

What is the most efficient 3-phase to single-phase AC transformer for a home grid

So a friend of mine is getting electrical power installed for an urban site he bought, and I'm just trying to be a good friend by looking into this. The company doing the installation recommended he ...