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Zero rpm at the drive does not exclude the presence of a holding torque on the shaft of the motor due to load in some circumstances. The motor current will be a reflection of the torque presented at the shaft.
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How floating condition of synchronous motor occurs?
at the time of starting when syncchronous torque is zero , i.e. when the motor starts with the help of starting torque , the armature current required to produce sync. torque is zero. If V = E(b) i.e. When back emf E(b) equals supply voltage.
What are the application of differential compound generator?
Differential compounded generators are used in Ward Lenard motor generator loops. The shunt fields on these generators are separately excited and when the shunt field polarity is reversed by the controller the series field helps drive the generator voltage to zero thus aiding in the reversal of current.
Which device has its characteristics very close to that of an ideal current source?
A: A current source can be defined as a zero impedance source. A battery is essentially a zero impedance since it can provide lots of current with zero volts out
Example of ideal constant-current source?
A current source ideally should be with an internal impedance of 0 zero. So even if the output is zero volts current can flow.
When is the collector current approximately zero?
In CUTOFF.
What is locked rotor in three phase induction motor?
A motors locked rotor current is the same as the motors starting current. This is the point where the voltage is applied to a non rotating motor, time cycle zero. Because the motor is not rotation and generating a back EMF to oppose the inrush current, the current will go as high as 6 times the running current of the motor.
What is stall condition of motor?
Stoll condition of a motor or Stall torque is the torque which is produced by a device when the output rotational speed is zero. It may also mean the torque load that causes the output rotational speed of a device to become zero - i.e. to cause stalling.Stalling is a condition when the motor stops rotating.This condition occurs when the load torque is greater than the motor shaft torque i.e. break down condition.In this condition the motor draws maximum current but the motor does not rotate.The current is called as Stalling current.
Core balance ct?
CBCT used to protect the motor winding from unbalance load it is install on the cable ,in normal balance conditions the sum of the three phase current is zero so secondary current of the ct also zero .when ever unbalance occurs then this unbalance current will flows through the ct then relay sense and trip motor
What is the value of current at zero volts?
Zero volts produces zero current.
What is zero drift current?
it is a current which has zero drift and it is ugly
Why an induction motor will never run at synhoronous speed?
An induction motor relies on low-frequency currents induced in the rotor by the difference in speed between the rotor and the rotating magnetic field. At sychronous speed the induced current is zero therefore the torque is also zero.
Why emf is not zero when field current is zero?
because zero is zero
What is the current of zero watts bulb?
zero
How do you zero phase current tranformer test?
How do you zero phase current transformer test
How much current flows through a resistor with zero potential difference?
No current flows when the the voltage is zero.
Is the dodge 2.7 motor a zero clearance motor?
Yes
What will be the effect if the d.c motor is directly connected across the supply without starter?
At zero rpm a dc motor draws a current that could be enough to blow the circuit breaker. In that case it is normal to place a resistor in series to limit the current to slightly below the circuit-breaker setting. The resistor is switched out after the motor runs up.
