0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
How do you tell how many poles a 3 phase 480 volt motor has?
It is based on the RPM of the motor. Use the following formulas for 50 and 60 Hertz. The mathematical formula is Frequency in Hertz times 60 (for seconds in a minute) times two (for the positive and negative pulses in the cycle) divided by the number of poles. For 60 hertz, the formula would be, 60 x 60 x 2 = 7,200 no load RPM divided by the number of poles will give you the nameplate RPM of the motor. eg from above formula 7200/2 pole = 3600 RPM, 7200/4 = 1800 RPM, 7200/6 = 1200 RPM
Can a 4 Pole 50 Hertz 440 V induction motor run at 900 rpm?
No. With the values given the motor will run at 1500 RPM. RPM = Hz x 60 x 2/# of poles. The only way the motor can be run at that speed is by using a VFD as its source of power.
Can a 2800 rpm motor replace a 1400 rpm motor for air compressor?
No
What is the maximum RPM does a 3 phase motor run at?
The formula for RPM is ; RPM = Hz x (120 (constant)) divided by the # of poles. Number of poles a motor has; # of poles = Hz x (120 (constant)) / RPM.
How do you calculate maximum current of 3 phase motor?
By using a simple formulae: f=np/60 where f= frequency, n is the number of pair of poles and 60 is in seconds that motor is turning. So a 4 pole motor with a frequency of 50 hertz will run at 1500 rpm. By manupilating the formulae: n= 50 multiplied by 60 devided by 2 therefore n= 1500rpm. The formula 120xFrequency/poles gives synchronous speed not actual shaft RPM. Induction motors must run at a certain % slip to obtain torque, so a 4 pole motor running at 50hz would be 120x50/4 = 1500 rpm, at 4% slip (operating speed) actual shaft RPM or rated speed would be 1440 RPM.
What speed will be obtained when converting a 500 RPM motor at 50 hertz to 60 hertz?
The speed at 60 Hz is 600 r.p.m.
How many poles in a six thousand RPM motor?
It depends on the frequency. At 60 Hertz, with an ordinary two pole synchronous motor, you cannot have an RPM that is greater than 1800, so a six thousand RPM motor has to have a different power supply.
What is the frequency of a crankshaft imbalance in an 8 cylinder engine when speed is 600 rpm?
20
How do you tell how many poles a 3 phase 480 volt motor has?
It is based on the RPM of the motor. Use the following formulas for 50 and 60 Hertz. The mathematical formula is Frequency in Hertz times 60 (for seconds in a minute) times two (for the positive and negative pulses in the cycle) divided by the number of poles. For 60 hertz, the formula would be, 60 x 60 x 2 = 7,200 no load RPM divided by the number of poles will give you the nameplate RPM of the motor. eg from above formula 7200/2 pole = 3600 RPM, 7200/4 = 1800 RPM, 7200/6 = 1200 RPM
What is the frequency of a crankshaft in an 8 cylinder engine when engine speed is 600 rpm?
20 Hertz
Can a 4 Pole 50 Hertz 440 V induction motor run at 900 rpm?
No. With the values given the motor will run at 1500 RPM. RPM = Hz x 60 x 2/# of poles. The only way the motor can be run at that speed is by using a VFD as its source of power.
Why 2900 rpm motor is less price than 1450 rpm motor?
Materials for producing 2900 rpm motor is less than 1450 rpm one
What is the Amperage of a 20 HP motor at 380 VAC 3 phase 50 Hertz?
20 HP Three phase 360 volt what is the amps
Can a 2800 rpm motor replace a 1400 rpm motor for air compressor?
No
What is recommended hertz for running a 1hp 1750 motor?
What are the ratings on the label plate of your motor? I got the 1 horsepower and the 1750 rpm, but what is it rated for in cycles per second, or Hertz? Regardless of the horsepower rating or the rpm, AC motors are designed to run on a specific frequency of alternating current sine wave. Without some sophisticated and expensive equipment, you cannot change the frequency (Hertz) of your incoming electrical supply. What is recommended by me is to buy a motor that matches your power and speed requirements, and make very sure that its frequency rating is the same as your power utility supplies. If you live in the U.S.A. or Canada, the supplied frequency is 60 Hz.
What is the wavelength if the speed 331 meters per second and the hertz is 20.0?
331/20 = 16.55 meters.And by the way ... The hertz is not 20. The 'frequency' is 20 hertz.
What is the relationship between motor POLE and RPM?
Relationship between motor rpm and no of poles
