50-60hz transformer design

[ahlburuto]

Anu bang pinagkaiba ng dalawa? Is it the turns or the EI core size or what? Pano naman makonvert ang 50hz transformer sa 60hz? Meron kasi akong nabiling clock radio dito sa singapore at 50hz ang design nya. When i open it ay madaming secondary. Meron 9vac at isang 12vac na center tap.

Ngayon me isa pa akong question, since clock radio ito eh meron tong timing. If ever ba na nakakita ako ng replacement or nagawan ko ng paraan, di ba maapektuhan ang timing nya? Di ba bibilis ang oras?

regards to all....

[ferdie444]

Anu bang pinagkaiba ng dalawa? Is it the turns or the EI core size or what? Pano naman makonvert ang 50hz transformer sa 60hz? Meron kasi akong nabiling clock radio dito sa singapore at 50hz ang design nya. When i open it ay madaming secondary. Meron 9vac at isang 12vac na center tap.

Ngayon me isa pa akong question, since clock radio ito eh meron tong timing. If ever ba na nakakita ako ng replacement or nagawan ko ng paraan, di ba maapektuhan ang timing nya? Di ba bibilis ang oras?

regards to all....

bro,suggestion lmang.d ba pwede palitan ng 60hz na transformer w/ same secondary voltage?or you can put external power supply like adaptor.

I think d maaapektuhan yung clock dhl rectified dc output ang supply nya eh @ ung 50hz eh for ac line voltage.let's wait for the comment and suggestion ng mga m8's natin d2 sa forum.thanks and more power...........

[jepps137]

possible na ginagawang DC niya rin yung suppy. possible na yung isang supply eh para sa clock, at yung isa para sa radio kaya dalawang set ang secondary niyan. ngayon kung sa 50Hz rated yan at ikakabit mo sa 60Hz, tapos dadaan ng rectification, ang possible consequences are,
1. mas mataas ang DC output, so kung hindi regulated ang output ng rectifier/filter, baka maka-apekto sa clock and radio units.
2. since mas mataas ang DC, baka kailangan mong taasan ang rating ng filter caps. in terms of max voltage.

[ahlburuto]

ok salamat sa mga replies....


br

[tony]

Anu bang pinagkaiba ng dalawa? Is it the turns or the EI core size or what? Pano naman makonvert ang 50hz transformer sa 60hz? Meron kasi akong nabiling clock radio dito sa singapore at 50hz ang design nya. When i open it ay madaming secondary. Meron 9vac at isang 12vac na center tap.

Ngayon me isa pa akong question, since clock radio ito eh meron tong timing. If ever ba na nakakita ako ng replacement or nagawan ko ng paraan, di ba maapektuhan ang timing nya? Di ba bibilis ang oras?

regards to all....

yung 50hz na traffo pag ginamit sa 60hz okey lang, walang babaguhin, pwdeng gamitin as is basta tama ang mga voltahe...pero yung 60hz na traffo pag ginamit sa 50 hz, kulang na ng turns sa primary...

pero para sa ganyang kaliit na traffo, walang gasinong pinagkaiba...kung gusto mo ng computation, simpleng ratio and proportion lang yan...

[enriz622]

mas maraming wind ang 60hz gagana nga dito sa pinas yang 50hz pero mahihirapan siyang sumabay sa cycle dito 60hz kasi tayo dito,kung pwedeng dagdagan yung primary nyan dagdagan mo mga 200 turns pa.di naman maapektuhan ang timing nyan kasi di naman nagrerely ang clock sa cycle ng supply,may sariling counter yan

[TinTopHack]

Additional info:

A transformer is an inductive device. So it has inductive reactance (impedance) that increases with freq.

Take a transformer designed for 50Hz. If you use it at 60Hz, its inductive reactance will be higher so the primary winding current will be lower at the same input voltage. On the secondary side the inductive reactance will also be higher so if the load tries to draw the same amount of current (as in 50Hz) the voltage drop across this XL will also be higher so the secondary voltage will be slightly lower for the same load (same output current) when compared to 50Hz operation.  But usually this drop in voltage is can be tolerated by small loads like clock radio because there is usually a regulator inside.

Conversely if you take a transformer designed for 60Hz and use it at 50Hz, its XL will be lower so for the same input voltage, the primary current will be higher. This can cause overheating of the primary winding especially if the wire size can not handle it. Thus we sometimes say na kulang na ang primary turns because to reduce the primary current to a safe level it is necessary to increase the primary turns - increase XL to reduce current. Similarly on the secondary side it easier to draw current because of lower XL. So for the same load at the secondary you can get slightly higher secondary voltage.