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محمود شرفمشرف
- عدد المساهمات : 67
تاريخ التسجيل : 14/06/2010
العمر : 36
Finding Synchronous Speed
الجمعة 16 سبتمبر 2011, 8:49 pm
AC motors are considered constant speed motors. This is because the synchronous speed of an induction motor is based on the supply frequency and the number of poles in the motor winding. Motors that are designed for 60 hz use have synchronous speeds of 3600, 1800, 1200, 900, 720, 600, 514, and 450 rpm.
To calculate synchronous speed of an induction motor:
Srpm =( 120 x f ) / Np
Srpm = synchronous revolutions per minute.
f = supply frequency in (Hertz)
Np = number of motor poles
• Example: What is the synchronous speed of a four pole motor operating at 50 hz.?
Srpm =( 120 x f ) / Np
Srpm =( 120 x 50 ) /4
Srpm = 6000 /
4
Srpm = 1500 rpm
To calculate synchronous speed of an induction motor:
Srpm =( 120 x f ) / Np
Srpm = synchronous revolutions per minute.
f = supply frequency in (Hertz)
Np = number of motor poles
• Example: What is the synchronous speed of a four pole motor operating at 50 hz.?
Srpm =( 120 x f ) / Np
Srpm =( 120 x 50 ) /4
Srpm = 6000 /
4
Srpm = 1500 rpm
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