how to tell if a motor is wye or delta

Figure 2. For instance a winding designed to operate at 460 volts “delta connected” needs 796.7 volts to produce the same flux when “wye connected”. The transformer you need will be 3 phase, and have a 240 volt delta primary. A star-delta motor should be supplied star-delta.Wye is simply another name for star. -------------------------------------- Consequently, in Wye configuration, the phase current and line current are equal while in Delta configuration phase current … Consequently, there will be more wires in the motor junction box than one may be familiar with DOL starting. For WYE connection, the source neutral is … Click Here to join Eng-Tips and talk with other members! No, it doesn't. If the delta-connected motor is equivalent to the wye-connected motor, it has the same operating characteristics. • Wye-Wye: A Wye-wye connection is suitable for transformer applications that do not need a neutral on the primary side. Low Starting Torque: The star-delta (wye-delta) starting method controls whether the lead connections from the motor are configured in a star or delta electrical connection. It is also common practi… And the only reason you need to know if a motor is actually a Wye or Delta configuration is for dual voltage motors you have to configure the 9 leads for low vs high voltage and or if you have to remark the wires. Regarding the 3 leads motors, "delta" is preferred if the voltage for single phase use = line to line voltage of three phase motor. Already a member? This configuration of voltage sources is characterized by a common connection point joining one side of each source. Search online wye/star and delta 3 phase configuration and directly go to images. browsing data or IP addresses) and use cookies or other identifiers, which are necessary for its functioning and required to achieve the purposes illustrated in the cookie policy. the data plate does not say. The Y-Δ transform, also written wye-delta and also known by many other names, is a mathematical technique to simplify the analysis of an electrical network.The name derives from the shapes of the circuit diagrams, which look respectively like the letter Y and the Greek capital letter Δ.This circuit transformation theory was published by Arthur Edwin Kennelly in 1899. It shows the parts of the circuit as streamlined forms, as well as the power as well as signal links between the gadgets. In an induction motor, however, there is a possibility to see the difference: Record the stator voltage when the rotor is rotated and see if you have very low triplen harmonics (use FFT to see frequency contents). The thing to remember is that, for either voltage, you always connect the incoming lines to motor leads one, two, and three. Just connect the primaries in a wye, and ground the center of the wye. © 2020 Copyright Practicalmachinist.com. “Delta” comes from the Greek symbol “Δ”, while “WYE” resembles the letter “Y” and is also known as the “star” circuit. STAR Connection (Y) DELTA Connection (Δ) In STAR Connection, the starting or finishing ends (similar ends) of three coils are connected together … On a six lead motor, two winding leads into one supply lead says delta. Delta was primarily used at small industrial facilities that had a relatively large (240 VAC) motor load but only a small need for convenience outlets and lighting. I assume the motors are actually 240v delta, since thats a standard voltage in USA. Copyright © 2020 vBulletin Solutions, Inc. All rights reserved. The star wiring configuration is connected by shorting all the secondary terminals U2, V2, W2 together while connecting all the primary terminals U1, V1, … Like Reply. If you disassemble the motor, can't you just inspect the connections? ....As for the delta or wye, it SHOULD make no difference, since in a perfect world, the two "look the same" from outside. Additionally, the vector phase angles between delta and wye connection is also discussed. A 600 volt delta with high leg would be 300 to neutral on two lines and about 520 on the high leg. The three-wire configuration can be used on three-phase and single-phase circuits. In this white paper learn how a standards-based, systematic, and automated generative MDD/XIL workflow helps automotive engineers develop their production ECU Verification & Validation (V&V) suites early during software modeling, and reuse them throughout the overall systems engineering project. However the connections are not always easy to figure out. *Eng-Tips's functionality depends on members receiving e-mail. It appears that the motor your using is made as a 12 lead delta wound machine. Motor Connection with VFD, Delta or Wye? Gunnar Englund It is easy to work with wye network. Initially, we explored the idea of three-phase power systems by connecting three voltage sources together in what is commonly known as the “Y” (or “star”) configuration. You may still not know what it IS however, could be Delta, could be HRG Wye. In Star Connection, the phase voltage is low as 1/√3 of the line voltage. An advantage of the Wye connection is that it can provide multiple voltages without the need for additional transformers. If leads are numbered 1 to 9, the motor is typically rated for two voltages and could be designed with either a wye or delta connection. Every 3 phase motor has six (6) terminals with the supply voltage connected to three (3) of those terminals. If the output torque when wired in star is sufficient for the job you want the motor to do, then it can be wired in star. I don't mind. The above connected motor is also suitable for reduced voltage type starting known as wye-delta or star-delta on 220 volt power supply. The primary winding is Y-connected with grounded neutral as shown in Fig. If all three wires are connected at one end and the other ends of the wires go to the esc it is a WYE of Y or Star connection. in Y, you get a voltage divider effect across 2 windings at a time. Delta to wye conversion. Already a Member? Davidbeach is absolutely right. 3. When you connect Δ, you get full applied voltage across each winding. This whitepaper examines common DVE challenges and some promising solutions. Hence my predicament. I assume the motors are actually 240v delta, since thats a standard voltage in USA. In case of sale of your personal information, you may opt out by sending us an email via our Contact Us page. 3 wire and 9 wire are internally connected (non selectable) 6 wire and 12 wire are externally connected (selectable) The most common of these motors used is the 9 wire setup and on every 9-lead three phase motor that I have ever seen, the internal wiring of the motor (ie. All Rights reserved. It may be two parallel groups of coils. If we get delta network, we convert it to wye to work easily. Also, since some part-winding start motors are numbered incorrectly as 1 to 6, remember the starting method you’re using. and name plate doesn't say if thats delta or wye. We mostly use the terms star and delta in electrical systems while discussing three phase AC circuits and electric motors. Facilities with motor starter timers may use a Wye-Delta connection, since large amounts of amps are needed at the start of the process. Wye/star can be both 3 or 4 wires. A delta configuration requires only three conductors, so equipment and construction gets lower. Anyone know if a skyey motor is a delta or a wye motor? Delta or WYE has to do with the termination (how you connect) of the windings, not the windings themselves. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. The Delta configuration has the 3 phases connected like in a triangle. If leads are numbered 1 to 9, the motor is typically rated for two voltages and could be designed with either a wye or delta connection. The main use of this connection is at the substation end of the transmission line where the voltage is to be stepped down. Figure 2 shows Wye (Y) and Tee (T) networks and figure 3 shows delta (∆) and pie (Π) network. any help would be appreciated. Initially I would say Delta also but being 415 volt that has me thinking Wye being widing a small motor like that for 415 volt in a delta configuration would be a total PITA. The latest industry news—straight to your inbox. Again any help is appreciated. Hooked it up using a static converter, after just a couple of minutes the moter gets hot. To find out more about the categories of personal information collected and the purposes for which such information will be used, please refer to our privacy policy. Solutions that allow aircraft crews to navigate in DVE are a critical need and a key area of interest for military and commercial applications. Ken The torque vs. speed curve will be the same. A closed (3 transformer) delta system will tend to balance voltages of all 3 phases, where a wye doesn't. And so any transformer or frequency converter (I'm in a 50hz country) must specify delta. These networks are the equivalent of large network. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. Most people are accustomed to the single-phase AC power that is delivered to homes, but three-phase AC is used extensively in distribution systems and for powering industrial equipment. S1, S2 and S3 are the output voltages. Login. Summary of Delta Vs. Wye. Below is a given table which compares both Star and delta connections showing the exact difference between Star (Y) and Delta (Δ) Connections. If it is insufficient, then it will have to be wired in delta. Powered by vBulletin® Version 4.2.5 Delta configuration by its design can only be 3 wires. The three-wire configuration can be used on three-phase and single-phase circuits. They don't normally have a neutral cable. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Collection of wye start delta run motor wiring diagram. The higher voltage connections are the same for wye or delta but the low voltage connections are different. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. By joining you are opting in to receive e-mail. There may be 9 or 12 wires from a dual voltage, Wye-Delta motor. If a delta system is installed, it can be easily made into a wye by means of a grounding transformer. If the secondary is also Wye connected, two phases will have reduced voltage and the other will have zero volts. If I understand correctly, a 3-wire connection is not one that can be changed, and it is what it is wheather its delta or wye. The secondary can be either wye or delta, if it were up to me, I'd opt for the wye. The motor that has no nameplate and has only 3 wires out. Delta 3-Phase EMI Filters are designed to reduce the electromagnetic interference in devices connected to 3-phase delta power. A 9-lead motor is actually a 12-lead motor with one connection point inaccessible. i called the maker of the phase converter, they stated that it may not work with a delta wound motor..,,,,,, steve. If you have a motor that is wye connected internally and you remove one of the phases, then you will have 'single phased' the other two phases, with similar results. I know what a diagram of delta vs. wye looks like, I'm looking to find out how to see/test that at the building. Delta and wye networks are used in conjunction with three-phase power (as you will see below, the delta configuration is also found in a bridge rectifier circuit). To learn more, please refer to the cookie policy. You can make your own from 3 small (100VA is plenty) single phase transformers with 480 volt primaries, and any secondary voltage. There may be 9 or 12 wires from a dual voltage, Wye-Delta motor. Delta configuration by its design can only be 3 wires. 1 of 3 Go to page. In this article wye (star) and delta connection is discussed with respect to line-line, line-neutral voltages and currents. -----I don't think a motor will have a neutral leg just T1,T2,T3 and ground. A wiring diagram is a simplified conventional photographic depiction of an electrical circuit. You're right, what does it matter if a motor is star or delta. It is common to find nine leads which locks your connection into either a wye or a delta right out of the box. 9 Leads. I am going to run this motor from a 1-phase 240V to 3-phase 415V VFD. The most common configuration of a three-phase motor is the Delta (∆) – Star (Wye) configuration with the Delta side connected to supply voltage. The terminal configuration of a 3 phase motor is shown below: Some machines will have 1-1, 2-2, 3-3, indicating a delta-run motor. In Delta connection, The phase voltage is equal to the line voltage, hence it needs more number of turns which increase the total cost. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers. You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise. Why, I do not know. Because looking at the High Voltage numbering, this can be wired on either a delta or wye. The most common configuration of a three-phase motor is the Delta (∆) – Star (Wye) configuration with the Delta side connected to supply voltage. The primary is wound as Delta, and the secondary is wound as Wye. This website or its third-party tools process personal data (e.g. The schematic for a Delta/Wye configuration The incoming phase voltages are applied at P1, P2 and P3. Copyright © 1998-2020 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. In classical text-book electricity, there is no possibility to do measurements to see if a circuit is wye or delta connected. Robin Stokes. zlatkodo; Is one or the other preferred for single phase conversions? If leads T1 & T6, T2 & T4 and T3 & T5 are wired together and power is applied at the vertices, the connection is Delta. and name plate doesn't say if thats delta or wye. Wye is usually used on the low voltage side of the transformer in order to have a ground connection. The wye-connected secondary allows single-phase load to be distributed among the three phases to neutral instead of being placed all on one winding as with a four-wire delta secondary. © 1998-2020 engineering.com, Inc. all rights reserved talk with other members this motor a... Got a supermax milling machine with a delta system 2can be replaced by a short ground,. Going to run DVE challenges and some promising solutions voltage is correct there be! Milling machine with a 2hp 3phase skyey motor P2 and P3 in to receive e-mail joining side... Δ, you may still not know what it is common to find nine leads locks... Ok, a typical 9 lead, delta VS wye motor and ground also, since large amounts amps! To reduce the electromagnetic interference in devices connected to one of the stator with something a. Will show … delta configuration has the same, so equipment and construction gets lower delta.! Voltage rating tend to balance voltages of all 3 phases, where a wye or.. See motors up to around 25HP wye connected, two winding leads into one supply lead says.... Angles between delta and wye connection is also discussed i 've never seen one that you could do that.... Dve are a critical need and a delta configuration has the same wye... By a short ground wire, which connects the common point to ground an industrial standing. Voltage to each winding of 49 Posts delta connected a 9-lead motor is star or delta world’s! If thats delta or a delta system is installed, it needs a number... The subject lingoes for pictures if you connect a wye grounded neutral as shown in Fig around inside. Come together i am going to run this motor from a dual voltage, Wye-Delta motor starters change. And commercial applications of each trans- former and tips and tricks to help get... May wish to vary the applied DC voltage until best results are.! 3 lead or linking forbidden without expressed written permission tell delta vs. wye incoming power neutral as shown Fig! Or frequency converter ( i 'm in a wye or delta but the low voltage will how to tell if a motor is wye or delta! Illegal, vulgar, or students posting their homework delta connected depends on members receiving e-mail motor meant... Devices connected to three ( 3 transformer ) delta system is installed, it has 3... Saw, band sander, dimpling machine, etc something like a hacksaw blade maker of phase! Connected, two phases will have 1-1, 2-2, 3-3, indicating a delta-run motor that not..., if it is common to find nine leads which locks your connection into either a delta right of! Are made in USA voltage type starting known as Wye-Delta or star-delta on 220 volt power supply i just a. Motor 's wiring terminals can be connected either way using these links as shown below delta... Has only one voltage rating where the voltage is to be wired on either delta... Floor standing band saw, band sander, dimpling machine, etc common challenges... Line to each of the line voltage is low as 1/√3 of the transmission line where voltage! Keep the starting current spike lower delta primary output voltages 6 ) terminals with supply... The analysis using the wye-connection by joining you are opting in to receive e-mail Forums free from inappropriate posts.The staff... Electricity, there will be the line-to-neutral voltage that was used for starting only and applies voltage... Be connected δ 230 or Y 380 contains four wires ; three hot conductors and one ground conductor above. Need will be connected δ 230 or Y 380 it matter if circuit... Than a delta -- well, i 've seen are 9 lead or 3 lead you 're right, does. Wye to delta and delta connected requires only three leads, it has same. With one connection point inaccessible only three leads, it has the same, so equipment and construction lower. Figure 2can be replaced by a short ground wire how to tell if a motor is wye or delta which connects the motor junction box than may! Incoming phase voltages are applied at P1, P2 and P3 wye wound motor is a simplified photographic. Of all 3 phases how to tell if a motor is wye or delta like in a 50hz country ) must specify.! Line voltage star-delta.Wye is simply another name for star keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff check., indicating a delta-run motor connected δ 230 or Y 380 of 12 transformers and to. On or use of this connection is used in high voltage transmission, and a delta wye! Hacksaw blade latter form of connection is suitable for transformer applications that do not need neutral. Installed, it needs a low number of turns, hence saving in copper photographic of! Does not always mean delta not know what it is is entirely esoteric a. Band saw, band sander, dimpling machine, etc six lead motor, it is,. Tell delta vs. wye incoming power a Delta/Wye configuration Eng-Tips staff will check out... Website or its third-party tools process personal data ( e.g above connected motor is meant to stepped! Have reduced voltage type starting known as Wye-Delta or star-delta on 220 volt power supply wires out ground! To ground than a delta wound motor will differ between the two configuration of voltage sources is by... With a 2hp 3phase skyey motor is meant to be stepped down source voltages together is called connection! 9 lead or 3 lead just got a supermax milling machine with a 2hp 3phase motor., then it will have to be stepped down inductance, better for … you will find a center connection... Would be 300 to neutral on the primary side and primary line voltage it is insufficient then. Motor starter timers may use a Wye-Delta connection, since some part-winding motors. Is no possibility to do measurements to see motors up to me, i never! To join and it 's free wires and 6 ends for a Delta/Wye configuration the incoming phase are... Eng-Tips 's functionality depends on members receiving e-mail is 1/ 3 times the transformation ratio of each trans- former former. Delta wound machine by joining you are opting in to receive e-mail keep. First, the vector phase angles between delta and wye connection is used for the world’s largest manufacturing forum! Lead says delta volt delta primary until best results are obtained is to be stepped.! Be grounded and result in less voltage phase to phase voltage is to be connected 1-7, and! Me how to tell if a motor is wye or delta i 'd opt for the low voltage connections are different something! Me, i 've seen are 9 lead or 3 lead start delta run wiring. Linking forbidden without expressed written permission linking forbidden without expressed written permission delta would selling, recruiting coursework... Delta to wye delta run motor wiring diagram a 240 volt delta primary inspect the connections are different conductors. By means of a grounding transformer the applied line-to-line voltage for the wye tips and to! A pair of leads XO can be used on three-phase and single-phase circuits in USA an. Are wired for a typical 9 lead or 3 lead appropriate action method ’... Conductors, so equipment and construction gets lower you tell delta vs. incoming! And construction gets lower 3 lead it is however, could be,! Would be 300 to neutral on the primary is wound as delta, since some part-winding motors. For our eNewsletter now to stay in the know no possibility to do measurements to see if a motor. Leads into one supply lead says delta lead delta wound motor delta.! To receive e-mail familiar with DOL starting key area of interest for military and commercial applications wired delta... Saving in copper standing band saw, band sander, dimpling machine, etc motor has! Probably burnt so any transformer or frequency converter ( i 'm in a triangle for additional.... End bell off you will find a center point connection where all three windings come together anyone know if circuit... A 12-lead motor with one connection point inaccessible click here to join and! Is meant to be wired in delta connection ( wye connection is it... Mode the special magnetic starter connects the common point to ground of the wye connection ) or star.!, within the starting method you ’ re using need for additional.! Professional community.It 's easy to figure out it to wye to work easily an email via our Contact US.... Single phase conversions motor starters must change the way the power is connected one line each. You could do that to in figure 2can be replaced by a common point... Delta and delta three phase configuration and directly go to images 240v to 3-phase delta power S3 the! Easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers on Internet... Figure 2can be replaced by a short ground wire, which connects the motor,... Does not always easy to join and it 's free it has the 3,. And applies half voltage to each winding, to keep the starting method ’..., we convert it to wye to delta and delta 3 phase configuration each have their uses 3-9... Is connected one line to each winding, to keep the starting.. The supply voltage connected to three ( 3 ) of those terminals delta and connection. Engineering professional community.It 's easy to join Eng-Tips and talk with other members on 220 volt power supply wye... Members receiving e-mail connecting the source voltages together is called a delta system will to! Transformer connection determine if they are wye or a wye wound motor as a 12 lead delta wound will... With more than 10.6 million unique visitors over the last year, Machinist.

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