Belajar PLC dan SCADA

Just another Blog about Programmable Logic Controller & SCADA.

Running Induction Motors on frequencies other than their Design Frequency.

Written by Kang Abu on 6:10 PM

Induction motors use an iron core and require flux in the iron to
operate. In order to achieve the commercial goals of smallest size and
lowest price at best efficiency, induction motors are designed to
operate at a high level of flux in the iron. The flux is determined by
the turns, voltage and frequency. In a modern motor, if the flux is
increased by a small amount, the iron losses increase and the iron
tends towards saturation. At saturation, the inductance begins to fall
and the current increases further. To reduce the flux at a given
voltage and frequency, the turns on the stator are increased. This
reduces the Iron loss, but a longer length of thinner wire is used and
the copper loss increases. Design becomes a balancing act between
copper loss and iron loss and so the design is optimised for a given
voltage and frequency.

If the voltage applied to the motor is held constant
and the frequency is increased, the inductive reactance increases and
so the flux reduces. This effectively reduces the maximum torque
capacity of the motor and so the motor power rating at the higher
frequency remains the same.

If the voltage
applied to the motor is held constant and the frequency is reduced, the
current will increase and in theory, the torque will also increase. The
motor should be able to deliver the same power also, BUT the flux in
the iron is now too high resulting in excessive iron loss, and the
motor will fail prematurely. Above a very low frequency, (5 - 10Hz) the
impedance of the magentising circuit of the motor is primarily
inductive and so in order to keep the flux within limits, it is
important to keep a linear V/F ratio (Voltage to Frequency ratio). If
the frequency is reduced by 10%, the voltage must also be reduced by
10%. Because the flux in the iron remains the same, the torque capacity
remains the same and so the power rating of the motor also drops by 10%.

60Hz rated motor on 50Hz

Provided the voltage is dropped by the same proportion as the frequency, it is OK to run a 60Hz motor on 50Hz. The speed will be reduced by the reduction in frequency and the power capacity will also reduce by the ratio of the reduction in frequency.

60 Hz 50 Hz
Line Voltage Line Voltage
480 400
460 383
440 367
230 191


50Hz rated motor on 60Hz

Provided the voltage is increased by the same proportion as the frequency, it is OK to run a 50Hz motor on 60Hz. The speed will be increased by the increase in frequency and the power capacity will also increase by the ratio of the increase in frequency.

50 Hz 60 Hz
Line Voltage Line Voltage
415 498
400 480
380 456


Related Posts by Categories

Widget by Hoctro | Jack Book
Related Posts with Thumbnails

Our Advertising

Bantuan Pencarian

Jika anda seorang pemula dan tertarik untuk belajar PLC silahkan cek artikel di arsip artikel atau gunakan bantuan pencarian artikel di bawah ini. TQ Bro..

Email Subscribe

Dapatkan informasi dan artikel yang update dari situs ini. Jika anda barminat silahkan masukan email address anda di bawah ini. Terimakasih! (Please write email to subscribe our news).

Enter your email address:

Delivered by FeedBurner

Disclaimer (Privacy Policy)

No PDF Files stored in this site. are not responsible if you download and distribute files or links. Noted that not related in any way with upload files with a copyright material that available for download. Just we collects the information using google search and other search engines links hosted or posted by other website. The link Free Book Download available here are for EDUCATIONAL PURPOSES ONLY... and its recommended to buy the products from the original Owner or Publisher.

For Detail Please Click Here!

Jika anda mempunyai artikel sepurtar dunia automation (PLC dan SCADA) dan ingin sharing buat teman-teman blogger silahkan kirim ke

Jika anda menginginkan semua berita yang ada disitus dan links yang ada di situs ini menjadi bagian dari situs yang anda punyai silahkan masukan address ini (copy & paste): di fungsi RSS Feeder situs anda.