Questions tagged [single-phase]

AC power with two legs run 180 degrees out of phase

Filter by
Sorted by
Tagged with
0
votes
1answer
225 views

How do we design a control system with a mix of single-phase and three-phase electrical loads from a three-phase supply?

I have connected a three-phase incoming power to a MCCB, MCCB will distribute to a 3-phase transformer as well as few single phase equipment, which is means outgoing of MCCB L1, L2 & L3 to ...
1
vote
3answers
2k views

How is a higher torque achieved in a single phase cap-start cap-run motor?

The starting winding come capacitor circuit is there for starting the motor. When the motor reaches 80% rated speed, the centrifugal switch cuts the starting circuit out and leaves the run winding ...
0
votes
1answer
375 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 ...
2
votes
1answer
3k views

Single Phase Induction Motor Wiring help

I have purchased a Single Phase Induction Motor that runs anti-clockwise, I require it to run clockwise however I am unable to figure how to change the wiring to do this, any help would be appreciated....
0
votes
2answers
689 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 ...
1
vote
1answer
37 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 ...
-2
votes
1answer
335 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 ...
0
votes
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 ...
0
votes
1answer
320 views

Can a triphase current regulator be used with just two phases?

My house is located somewhere with power problems, these have been going on for 15 years and will probably never be fixed. Family lives next door and I want to regulate the power to both my house and ...
0
votes
1answer
893 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 ...
1
vote
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 ...
6
votes
3answers
803 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 ...
0
votes
2answers
66 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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
0
votes
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 ...
-1
votes
1answer
47 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: ...
13
votes
3answers
933 views

What capacitor(s) will be best replacement

Living and working in West Africa. We cannot purchase capacitors here, we can only beg (and pay) used parts from the workshops which rewind electrical motors. Our gray-water-pump is broken, the ...
2
votes
1answer
52k views

Correct Wiring of 1 phase 220v Electrical Motor

I am trying to install a single phase 220v electric water pump. I am fairly certain that it is wired correctly however the water pressure it is pumping out is absolutely useless. I have attached how ...
2
votes
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 ...
0
votes
0answers
75 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 ...
0
votes
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 ...
0
votes
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 "...
1
vote
4answers
32k views

Three 1 phases vs one 3 phase power cost

Case1: If I have three single phase connections with each having its own single phase energy meters And I connect 1kw load on each of these phase continuosly 24/7 for a month. Case2: Now next month ...
0
votes
3answers
189 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 (...
0
votes
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 ...
0
votes
1answer
56 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-...
0
votes
3answers
517 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 ...
0
votes
1answer
119 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 ...
0
votes
1answer
605 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 ...
0
votes
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-...
0
votes
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 ...
3
votes
3answers
6k views

How do single phase BLDC motors start in proper direction?

There are descriptions on internet of the single phase BLDC motors which are powered by Vdc (such as PC cooling fans 12V). Interestingly pictures shown describing outrunner type with equal number of ...
0
votes
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 ...
0
votes
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 ...
0
votes
0answers
79 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 ...
1
vote
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 ...
0
votes
1answer
69 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 ...
1
vote
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 ...
0
votes
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 ...
3
votes
2answers
60 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 ...
0
votes
1answer
37 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 ...
1
vote
2answers
2k views

Help troubleshooting single phase motor

I have a single phase 230 volt motor. I am getting 230 volts (115 at each terminal marked with the red line in the image below). The motor is not drawing any amperage at all and is making no noise ...
3
votes
2answers
1k 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 ...
1
vote
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
0answers
892 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 ...