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“Power+” +0300050EN - rel. 2.3 - 08.06.2012 34
10. APPENDIX
10.1 Conversion formulas
RPS = F / (P / 2) RPS =RPM / 60
RPM = (F x 60) / (P / 2) RPM = RPS x 60
F = RPS x (P / 2) F = (RPM x (P / 2)) / 60
Key:
F frequency (Hz) of the voltage and current applied to motor
RPS revolution per second of motor shaft (rotor)
RPM revolution per minute of motor shaft (rotor)
P number of poles of motor (always an even number)
P/2 number of polar couples of motor
Nota: In AC motors (asyncronous induction motor) RPS and RPM
derived from previous formulas are not the actual value because of the
intrinsic rotor “slip”. The actual values is always lower than calculated RPS and
RPM values, and the di erence increase with the load. The RPM actual value is
motor dependent and it is usually speci ed by manufacturer at nominal load.
10.2 Conversion table
2 poles 4 poles 6 poles 8 poles 10 poles
F (Hz) RPS RPM RPS RPM RPS RPM RPS RPM RPS RPM
10 10 600 5 300 3,3 200 2,5 150 2 120
20 20 1200 10 600 6,7 400 5 300 4 240
30 30 1800 15 900 10 600 7,5 450 6 360
40 40 2400 20 1200 13,3 800 10 600 8 480
50 50 3000 25 1500 16,7 1000 12,5 750 10 600
60 60 3600 30 1800 20 1200 15 900 12 720
70 70 4200 35 2100 23,3 1400 17,5 1050 14 840
80 80 4800 40 2400 26,7 1600 20 1200 16 960
90 90 5400 45 2700 30 1800 22,5 1350 18 1080
100 100 6000 50 3000 33,3 2000 25 1500 20 1200
110 110 6600 55 3300 36,7 2200 27,5 1650 22 1320
120 120 7200 60 3600 40 2400 30 1800 24 1440
130 130 7800 65 3900 43,3 2600 32,5 1950 26 1560
140 140 8400 70 4200 46,7 2800 35 2100 28 1680
150 150 9000 75 4500 50 3000 37,5 2250 30 1800
160 160 9600 80 4800 53,3 3200 40 2400 32 1920
170 170 10200 85 5100 56,7 3400 42,5 2550 34 2040
180 180 10800 90 5400 60 3600 45 2700 36 2160
190 190 11400 95 5700 63,3 3800 47,5 2850 38 2280
200 200 12000 100 6000 66,7 4000 50 3000 40 2400
210 210 12600 105 6300 70 4200 52,5 3150 42 2520
220 220 13200 110 6600 73,3 4400 55 3300 44 2640
230 230 13800 115 6900 76,7 4600 57,5 3450 46 2760
240 240 14400 120 7200 80 4800 60 3600 48 2880
250 250 15000 125 7500 83,3 5000 62,5 3750 50 3000
260 260 15600 130 7800 86,7 5200 65 3900 52 3120
270 270 16200 135 8100 90 5400 67,5 4050 54 3240
280 280 16800 140 8400 93,3 5600 70 4200 56 3360
290 290 17400 145 8700 96,7 5800 72,5 4350 58 3480
300 300 18000 150 9000 100 6000 75 4500 60 3600
310 310 18600 155 9300 103,3 6200 77,5 4650 62 3720
320 320 19200 160 9600 106,7 6400 80 4800 64 3840
330 330 19800 165 9900 110 6600 82,5 4950 66 3960
340 340 20400 170 10200 113,3 6800 85 5100 68 4080
350 350 21000 175 10500 116,7 7000 87,5 5250 70 4200
360 360 21600 180 10800 120 7200 90 5400 72 4320
370 370 22200 185 11100 123,3 7400 92,5 5550 74 4440
380 380 22800 190 11400 126,7 7600 95 5700 76 4560
390 390 23400 195 11700 130 7800 97,5 5850 78 4680
400 400 24000 200 12000 133,3 8000 100 6000 80 4800
Tab. 10.a
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