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A variable sped drive is sometimes also known as a variable frequency drive. These drives are used in electro-mechanical drive systems to control AC motor speed and torque.
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Why variable speed compressor motors are more efficient than single speed motors in heat pump system?
This type of compressor uses a special drive to control The speed of the unit. Also, saves more energy than a fixed speed equivalent.
Why DC motors and DC generators are commonly known as DC machines?
because the dc motor will act as dc generator as same as dc generator acts as a dc motor .so it is called as dc machines.AnswerBecause generators and motors are machines, and operate on d.c.'A.C. machines' are generators, transformers, and motors which operate on a.c.
What is vfd called as variable frequncy drive?
VDF is variable frequency drive.In AC (alternative current) induction motors the speed is obtained by parameters like poles and frequencyformula Ns = 120 x f/ pwhere N= (synchronous ) speed rpm of motor. F = frequncy Hz of the power supply ex:50Hz, 60 Hzto obtain variable speed of the motor by changing the frequncy it is achived with the help of VFD device.
What are the methods of stopping a synchronous motor?
My experience with synchronous motors is in the operation of large rotating mills. In that case, the motors are decoupled from the load by means of an air-clutch, and main power is removed from the rotor and the stator. The motor coasts to a stop. If the motor is operated on a variable speed drive, it could be decelerated to very low speed before removing power.
why we use variable speed drivers in motor control units?
Variable speed drivers are necessary to be able to have different speed settings in a motor.
Which motors are used for speed controlling in India?
More than one brand of motors are used for variable speed control in India. ABB, Siemens, CGL, SEW Nord, Kirloskar etc etc.......
Why variable speed compressor motors are more efficient than single speed motors in heat pump system?
This type of compressor uses a special drive to control The speed of the unit. Also, saves more energy than a fixed speed equivalent.
Describe why variable speed compressor motors are more efficient than single speed motors in heat pump systems?
This type of compressor uses a special drive to control The speed of the unit. Also, saves more energy than a fixed speed equivalent.
Safe operating speed of a chop saw?
Chop saw motors are not generally variable speed, so you're stuck with whatever RPM the saw does.
What has the author Eric Roberts Laithwaite written?
Eric Roberts Laithwaite has written: 'Linear electric motors' -- subject(s): Electric motors, Induction, Induction Electric motors 'Electrical variable-speed drives'
What is the difference between Variable Speed Drive and Variable Frequency Drive?
A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFD's vary the speed of an AC motor by varying the frequency to the motor. VSD's referring to DC motors vary the speed by varying the voltage to the motor.
What factors determine the synchronous speed of an AC motor?
Number of poles and supply freqency determines speed of synchronous motor. For speed control of such motors Variable Freqency Drives(VFD) are used.
What has the author Robert W Carrubba written?
Robert S. Carrow has written: 'Electrician's technical reference' -- subject(s): Alternating current Electric motors, Automatic control, Electric driving, Variable speed, Electric motors, Alternating current, Variable speed Electric driving, Variable speed drives 'Put a fan in your hat!' -- subject(s): Juvenile literature, Inventions, Children as inventors
What is variable speed?
A Body has variable speed if it covers unequal distance in equal interval of time is known as Variable Speed
How do you decide whether the variable frequency drive is compatible with my DC motor or not?
Variable frequency Drive is not compatible with a DC Motor. VFD can be used only with AC motors, where frequency plays a key role in defining the speed of the motor.
What is the main function of Variable frequency drive?
Main function of Variable Frequency Drive is to be able to run the AC Induction motors at different speeds (by changing the frequency). The speed is a function of frequency. N - Speed. F - Frequency P - Pole N= ( 120 x F)/ P
What is the variable speed or acceleration?
Both speed and acceleration can be variable, depending on the circumstances.
