Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / kingshuk dey
A VFD motor is a motor that is compatible to be run with a VFD.
First off, in come applications, we need to vary the speed of the motor as per condition. Ex:- when the lift begins to move up, we need less speed to avoid jerk, then take up full speed. Also, we need to stop the lift slowly to prevent jerk.
So, to control the speed, we control the frequency of the current supply. (Variable Frequency Drives).
The formula is N=(120*f)/P. N is the max speed of the motor in RPM, 120 is constant, f is frequency, P is the number of poles in the motor.
Now you can't change the no. of poles in the motor. Hence, you change the frequency, which is directly proportional to the speed of the motor.
The VFD is also an intelligent device that you can program for timers, trips, alarms etc. It monitors the current intake of the motor etc.
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
how i chosse capacitor bank if my energy meter is 48 kvr? tell me capacitor bank chossen formula?
why we use condenser in the thermal power plant, althrough the same vapour will be again heated
What size cable (based on voltage drop) is required to supply a 40 A three phase boiler if the wiring system is 75V single insulated cables installed in non-metallic rigid conduit 56m from the main switchboard? Voltage drop in the consumer's mains is 8V.
When are the directional relays used?
A system absorbs 100 k J of heat and the increase in its internal energy is 100 kJ; the work done is
what is dry and wet frequency withstand voltage? why & where it is used??
Why power factor should not be in leading (capacitive) mode of any load.
DC transmission
Please brief working principle & construction of permanent magnet AC Servo motor
what is booster? and how it is connected in a circuit?
what will happen if ac and dc supplies given
what happen if drive input fail momentry at 48.5 HZ frequency?
Explain the working principle of Synchronous Generator and Assynchronous generator?
why high speed tripping relay is used in protection circuit why not normal relay
Are Refrigerators & Deep Freezers the Inductive load ? How to calculate the Power Factor & hence the Output Power for them ?
