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What determines the magnitude and polarity of the counter-emf in a dc motor?
Wiki User
∙ 11y ago
the magnitude is decided by the amount of flux, number of conductors, speed of the motor and the type of the winding used.
the polarity is decided by the direction of rotation of the motor and the direction of armature current flowing in the motor.
Wiki User
∙ 11y ago
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How can you rotate the dc series motor in both direction?
in any dc machine changing the polarity of the field will change its direction. here, in series motor, the field is in series with the armature, to which we feed the supply. hence, change the feeding polarity.
Will an ac motor run backwards if polarity is reversed at the outlet?
No, unless it is a three phase motor and you reverse only two of the phases.
Which motor run in both direction?
Trick question: all motors do if you invert the polarity of input.CommentNot a trick question! In the case of d.c. motors, for example, you have to reverse the polarity to either the field or the armature -not to both. If you reverse it to both, it makes no difference to the direction of rotation! For a three-phase induction motor, you must interchange any two line conductors.
Why the speed of synchronous motor is independent of load torque?
because we two different supply i.e a.c to the stator of synchronous motor and d.c to the rotor,hence we basically make opposite polarity by these two supplies.
Can cross-wiring an electrical outlet cause a household fan motor to smell like it is burning?
I think by 'cross wiring' you mean reverse polarity. This means the hot wire is connected to the neutral screw and the neutral wire is connected to the hot screw. This shouldn't have any impact on an AC motor, since AC voltage already changes polarity 60 times per second.
Why does the rotation of the motor reversed when change the polarity across the main winding coil?
When changing the auxilary face winding connection the current flow in the winding is changed so that the rotating emf direction is changed . Thats why the motor rotates in opposite direction.
How do you reverse polarity on ac motor?
Reversing polarity is not possible with an ac motor. Some do have wiring that will allow you to change rotation. The type and model of the motor can tell you if it is reversible.
How does current flow in a nonreversing motor?
If you are talking polarity. DC motors automotive application run poss to neg. But any dc motor can reverse by changing polarity.
Is the actuator motor on all wheel drives a reverse polarity motor?
yes sir
How is a DC permanent-magnet motor reversed?
Reverse the polarity of armature windings of the motor.
What does an o2 sensor do?
Depends on which one. One determines amount of air that goes into motor, other determines amount of air that goes out of motor.....
How can you rotate the dc series motor in both direction?
in any dc machine changing the polarity of the field will change its direction. here, in series motor, the field is in series with the armature, to which we feed the supply. hence, change the feeding polarity.
What determines the speed of an AC motor?
The higher the frequency the higher the RPM the motor will turn
How stepper motor started?
A: A stepper motor does it not start and spins but rather move to the next position according to the polarity of the power applied
Will an ac motor run backwards if polarity is reversed at the outlet?
No, unless it is a three phase motor and you reverse only two of the phases.
How do you Reverse direction on a DC motor?
a general purpose D-C motor can be reversed by changing the polarity of either the armature or the field but not both
What is the use of a magnet in a motor?
Magnets are used in motors to create motion. Magnets have two kinds of polarity, positive (north) and negative (south). When two magnets of the same polarity are facing each other, they will be attracted to each other. Conversely, if the polarity of the the two magnets are opposites than they two magnets will be repulsed. This concept of rotational motion is what is occurring in a motor.
