0
The name of the motor that can only operate on alternative current is called the AC motor. The AC motor consists of 2 basic parts with a rotor that is attached to the output shaft.
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
Why is a starting current in a DC motor very high?
A rotating d.c. motor generates a back-emf which opposes the supply voltage and reduces the current drawn by the motor. When the motor is stationary, it cannot generate this back emf and, so, the only opposition to current is the resistance of its windings which is relatively low. So, on startup, the current is large; as the machine starts to run, the resulting back emf, acts to reduce the current.
Why the armature rheostat of dc is motor kept at maximum resistance position?
It isn't. It is only kept at maximum resistance when the motor is not running. That is done to limit the starting current.
What field setting for a dc shunt motor wired in series on high voltage?
A shunt dc motor has quite different characteristics from a series motor. Wired in series, the same current passes through the armature and the field winding and it is most unlikely that a shunt motor would have a field winding that is suitable for this. Therefore a shunt motor cannot be wired as a series motor in general because its field winding is designed for only a small current.
What will cause a motor to go into a locked rotor state?
The only time a motor should go into a locked rotor condition is if the motors connected load jams causing the motor to stop turning. At this point if the motor control circuitry is sized to the motor's full load amperage, the high rise in current will trip the motor off line.
What is a possible cause of a motor taking excessive current?
Here are [the only] two: too much Voltage is applied, or there is some short [a reduction in the normal Resistance of the armature] that increases Current and lets the Smoke leak out.
Will a bell ringing transformer operate on direct current?
No. Transformers always operate only on alternating current. They will burn up on direct current. That is, if the fuse does not blow first.
If your 18 can you practice driving without a permit with an adult?
No. You can't operate a motor vehicle on public roads unless you have a current learners permit (then only with an adult), or with a valid drivers license.
Is a pool pump motor drawing half the amps listed on its nameplate a problem with the windings?
A pool pump motor which is drawing half the amps listed on its nameplate can indicate a problem with the windings or a lack of incoming current. Pumps will only draw as many amps as are required to operate under the current load.
What is meant by DC motor?
Only a DC motor uses direct current, and the reason is that it is the only supply available. There are also plenty of AC motors used when there is an AC supply. DC tends to be used for low-power devices like fans in electronic equipment.
Does motor breakdown insurance only cover a motor breakdown?
Motor breakdown insurance is specifically designed to cover a motor breakdown. However, in the event of a motor breakdown, this insurance will also cover roadside assistance and alternative transport.
What happens when a motor only has voltage no current?
Power is voltage times current. If there is no current, then there is no power. Without power, no work can be done, so the motor will do nothing.In all probability, if this is happening to a motor, then there is an open circuit someplace, perhaps an open winding.
What is the difference between D.C Motor and D.C Generator?
Both are simply opposite. First of all a motor is any thing which produces mechanical energy with electrical energy intake and Generator is Vice-versa. It produces electrical energy with mechanical energy intake.Both are in same principle of induction but in opposite direction. Few appliances work on AC and few on DC(Alternative current,Direct current). AC has two levels to fluctuate i.e Positive and Negative where as DC has only one value to speak with,either positive or negative. Now DC Motor "needs" DC charge to operate and DC Generator "produces" DC charge as the output.
What will happen when motor is connected to star?
If the motor is designed to operate on star (wye) then it is fine. If it is designed to operate on delta, then you need to consider that star will present lower operating voltage than delta, and that might damage the motor.Some motors are designed to start on star and run on delta. Usually, this applies to larger motors, and cannot be overlooked. If there are only three wires (ignoring chassis ground), then the motor is intended for delta. If there are only four wires, the the motor is intended for star. If there are six wires, then the motor is intended for star-delta. Of course, the starter controls could be integrated with the motor, so it is best to consult the name plate and operate the motor exactly as it was designed.
Why is a starting current in a DC motor very high?
A rotating d.c. motor generates a back-emf which opposes the supply voltage and reduces the current drawn by the motor. When the motor is stationary, it cannot generate this back emf and, so, the only opposition to current is the resistance of its windings which is relatively low. So, on startup, the current is large; as the machine starts to run, the resulting back emf, acts to reduce the current.
Why are alternate current motors easier to use than direct current ones?
In dc motor we need a complete kit of motor driving circuit whereas in af we only need a starter
Why the armature rheostat of dc is motor kept at maximum resistance position?
It isn't. It is only kept at maximum resistance when the motor is not running. That is done to limit the starting current.
What are some properties of germanium?
Germanium has the ability to operate as a diode, only allowing DC current to flow one way.
