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o Calculate the speed of a induction motor, apply this formula:

                                        Srpm = 120 x F
                                                  P

                         Srpm = synchronous revolutions per minute.
                                      120 = constant
                           F     = supply frequency (in cycles/sec)
                           P    = number of motor winding poles

Example: What is the synchronous of a motor having 4 poles connected to a 60 hz power supply?

                                       Srpm = 120 x F
                                                 P
                                      Srpm = 120 x 60
                                                 4
                                        Srpm = 7200
                                                 4
                                      Srpm = 1800 rpm
7.4.2

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7.4.2

  • 1. o Calculate the speed of a induction motor, apply this formula: Srpm = 120 x F P Srpm = synchronous revolutions per minute. 120 = constant F = supply frequency (in cycles/sec) P = number of motor winding poles Example: What is the synchronous of a motor having 4 poles connected to a 60 hz power supply? Srpm = 120 x F P Srpm = 120 x 60 4 Srpm = 7200 4 Srpm = 1800 rpm

Editor's Notes