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# DC MOTOR ON HIGH PRESSURE AXIAL CAM PUMP

Hi
I feel a little bit confused with the information given on each dc motor.
I have a chineese high pressure washer (1400 Watt ; 220V; rated pressure of 70 bar;flow 5.5 l/min) I dont know the RPM of the motor.
I want to change the ac motor to 24Vdc motor.
the main issue is the torque (I believe that the needed RPM is about 2000-assumption only). I assume that the efficiency of the AC motor/pump is about 80%
so if I assume correctly...
P[watt]=T[N/m]w[rad/s] therefor 14000.8=T(20002*pi/60) ==> T=5.5[N/m]

so if that's the torque i need, that's almost only motor that is proper for me:

https://hobbyking.com/en_us/turnigy-sk8-6374-149kv-sensored-brushless-motor-14p.html

as I understand it's datasheet, it has 3500W for 149Kv and Max voltage of 45V. so if I assume correctly

P[watt]=T[N/m]w[rad/s] therefor 3500=T(149452*pi/60) ==> T=5[N/m]

are my calculation correct, because I never dealt with DC motors?

thanks

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