Questions tagged [single-phase]

AC power with two legs run 180 degrees out of phase

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1answer
36 views

Small motor seized

Alright I'm trying to get my pellet grill up and running prior to Thanksgiving and I seem to have a seized motor. The past few days I was working on clearing a pellet clog in the middle of the auger ...
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1answer
42 views

SCR bridge control circuit

I want to design a single phase 400V 1A power supply using mains (230VAC,50Hz). For which I plan to use a step up transformer which will step up to 400V and then an SCR Bridge rectifier to convert it ...
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1answer
88 views

Single phase motor starting from high leg voltage

Typically stinger voltage is said to be nonuseable, the 208V between a high leg and a bastard tap. High-leg-delta configuration (Wikipedia). But since single phase motors require a phase offset to ...
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2answers
65 views

Fan humming sound when decreasing speed with a dimmer [closed]

I am using a ~large 400mm wall mounted metalic fan (specs below). I wanted to decrease the speed (and noise) with light dimmers (I tried 2 models so far) but when speed is decreased it makes humming ...
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1answer
34 views

How to generate sinusoidal signal using hybrid SPWM modulation in single phase inverter?

I understand there are bipolar, unipolar SPWM. Since the switching loss is quite high in these, there also exists a hybrid scheme where for half of the cycle the gates are either on or off reducing ...
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0answers
61 views

Transformer load

I have 50 kVA delta-wye transformer with 3 single phases secondary (line-neutral) delivered to 3 houses, So if one of the 3 houses drown more power would that affect another 2 houses, or each phase ...
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35 views

error iteration limit reached ,I'm a beginner to ngspice I'm using ngsipce by esim fossee help me out pls?

enter image description here I m trying to single-phase bridge inverter. here I have attached the error image, Schematic, source detail(pulse generator, Dc) transient analysis time. If I'm done a ...
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3answers
797 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 ...
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42 views

design 3phase vs single phase power supply 1500w

Whats the benefit of a 3phase power supply vs single phase power supply beside the higher power ratings? Is there difference in a power supply component's efficiency if designed for 3 phase vs single ...
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1answer
94 views

Connecting a three phase electric motor to a single phase power supply

I would like to know what the cheapest and easiest way to connect a three phase 2.2kW AC induction motor to a single phase 230V power supply is. Also, in this setup, how can the motor be started and ...
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1answer
46 views

Power-supply input power problem; single phase 220 V AC need to connect to 3-phase multi-voltage (208~520 V AC)

I bought POWER SUPPLY 3-PHASE, SMOOTHED. I used previous power supply 1-phase as following condition; Previous supply spec.: 960W 24V 40A Input: 1 phase 2 wire Output: 24V DC / around 20A Load: ...
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73 views

gdt and mov surge protection

greetings fellow engineers, i came by to ask you for help, i'm building a circuit that needs to be as resistant to surges as possible. I did my research, and make to this circuit: as it is supply by ...
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1answer
334 views

Wiring 240 V single-phase AC induction motor to enable operation forward and reverse on a 2-post ramp pulley system

I installed a single phase motor on a car ramp. I need the motor to operate forward and reverse, so the ramp goes up or down. I understand this is possible with the use of two contactors. I need the ...
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0answers
50 views

How to find a transformer for a dry cleaning machine?

My dad asked me to help him find a price estimate and figure out the ordering process for a new transformer for his dry cleaning machine. He's not that fluent in English and isn't too comfy using the ...
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2answers
79 views

Connect motor in 220 VAC single phase (Line - Neutral) or in 110VAC two phases (110VAC - 110VAC "180 degree out of phase")?

I need to connect A motor of 220VAC to single phase connection :Line - Neutral(220VAC - Neutral). In my country that doesn't exist so in my country we have this : L1-L2-neutral (110VAC - 110VAC "...
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2answers
680 views

How can I test the rotor winding of a single phase brushless alternator on a generator?

Context Generator runs but no power output from the alternator. The manual gives Ohm readings for the stator, excitation and rotor windings. The stator and excitation coil are to spec and have no ...
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1answer
54 views

Can a 3 phase solid state relay be used instead of 3 single phase relays?

Apologies if this is similar to another question, but I did look before posting. I am trying to understand what exactly differentiates a 3-phase relay from a 1-phase relay. I am controlling three 1-...
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2answers
110 views

Why is induced EMF of an inductor considered as average voltage and not RMS or maximum?

So my professor discussed to us about induced EMF of an inductor and mentioned that it is an average value and not maximum or RMS if you were to consider which type of voltage it is from the different ...
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1answer
117 views

I have a single phase induction motor, with no capacitor, and can't see the shaded pole. Can you help me understand how it starts or should start?

I have a small single phase, induction motor with no capacitor. It's not missing, so this has got me thinking it should be a shaded pole. However, I don't see the shaded pole and my motor is just ...
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0answers
40 views

3-phase PWM inverter

I'm trying to design a three-phase PWM inverter connected to the same single-phase DBR and ac source while keeping the same load for each phase. I have the one-phase circuit but can't do the three-...
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1answer
589 views

Connection for 11,12 and 14 in the relay based water pump setup

I have a question regarding a relay based water pump setup which is triggered by a float sensor in the water tank. As you can see in the figure, I have two relays which are single phase AC. Both ...
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0answers
52 views

Phase locked loop for Grid synchronization

Is there any IC available to implement PLL for the single-phase grid-connected inverter? one solution that I came across is using Texas instruments C2000 series microcontrollers and I also searched ...
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0answers
78 views

Single-phase thyristor full bridge rectifier vs three-phase thyristor full bridge rectifier

For Single-phase thyristor full bridge rectifier compared to a three-phase thyristor full bridge rectifier, with regards the input current harmonics, does the three- phase rectifier have an advantage ...
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2answers
49 views

Frequencies of current harmonics 1 phase diode bridge rectifier

I was wondering what would be the frequency of the current harmonics at the input of a 1phase diode bridge rectifier. My believe is that it should be 60Hz for Is1, 180Hz for Is3, essentially every ...
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1answer
67 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
75 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
72 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
59 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
36 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
87 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
114 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
95 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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0answers
881 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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0answers
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
2k 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
882 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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0answers
54 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
307 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
69 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
557 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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0answers
126 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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1answer
646 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
513 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
225 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
9k 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
5k 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
97 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
53 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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1answer
89 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
3k 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 ...