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The frequency of the applied voltage is constant.
Maude Kulas
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Does the velocity of a car traveling at constant speed around a pole change?
yes, It accelerates (and does so at a constant rate - if the rate of turn is constant) in the direction of the turn. The speed is constant, but the direction the car is going changes at each instant in time because it is turning. And because it is changing direction, that means its velocity is changing (because velocity is speed plus a direction vector).Read more: What_happpens_to_a_car_moving_at_a_constant_speed_as_it_turns_a_corner
What will the speed of the upper end of a 3.25 m long pole be just before it hits the ground if the pole is balanced vertically on its tip if it starts to fall and its lower tip does not slip?
I believe the way you calculate this is to write up an equation for total energy when it is falling: on the one hand, there is the kinetic energy of the center of mass; on the other hand, the rotational energy (you need to know the moment of inertia of a pole for this). The total energy when it is falling must be a function of the speed (or rotational speed), and this total energy must be equal to the potential energy the pole had before it started to fall.
What are the factors on which the torque depends?
The maximum torque occurs at somewhat lower speed than the full-load working speed of the motor, probably about 50% more than the torque at full power. Assuming that the motor is a 2-pole one that runs at 90-95% of the synchronous speed, 3000 rpm on 50 Hz or 3600 rpm on 60 Hz, the amount of torque is proportional to the power of the motor. In SI units the mechanical power equals the torque times the angular velocity, so watts = torque in Newton-metres times speed in radians per second (2.pi radians is one revolution). So the main factor that determines maximum torque is the rated power of the motor. Double the power, double the torque for a motor running on a constant-frequency power system.
Why must the direction of the current in a motors electromagnets be switched repeatedly?
The magnetism set up in the motor, attracts opposite poles. One pole is in the rotor and the the other on the stator. The attraction causes the rotor to turn. If allowed to continue, the pole will get as close as possible and then stop. The motor will stall. On a brushed, DC motor, the commutator acts as a switch and turns off the nearest coils and connects the next one along, allowing continuous rotation. On an AC motor, the supply is changing direction, this acts in synchronization with the rotation.
What is the scientific term of polarity?
Polarity means, what kind of pole, which would either be an electrical pole with a positive charge and a negative charge, or a magnetic pole with a south pole and a north pole.
Why does a shaded-pole motor run at a constant seed?
The frequency of the applied voltage is consant.
Are the motor used in tape recorder are split phase?
AC motors are not suitable for tape recorders because the speed can not be kept sufficiently constant. Tape recorders use dc shunt-wound motors with electronic speed control.
How many poles can a shaded pole motor have?
2
What kind of motor uses a differential reluctance pole to produce starting torque?
shaded pole
What are the types of motor using in table fan?
The motor used in a table fan is usually a shaded pole motor.
A shaded pole motor coil will have a resistance of approximately?
15 to 40 ohms.
What will happen if you place too many washers on the end of a shaded-pole motor shaft?
The rotor will jam.
Why won't my shaded pole motor run?
A shaded pole AC motor has a part of it's stator short circuited by a copper ring. When the flux in the main part of the stator increases, the flux through the copper ring with have a small delay, since it wants to keep its flux constant. Therefor you get a small rotational component to the field distribution, which makes the rotor turn.
What are the applications of a shaded pole motor?
When the coil in the relay needs to run off an AC signal rather than DC. The shaded pole keeps the relay from "chattering" every time the AC current crosses 0v on the sine wave.
What if a shaded -pole motor is chattering or buzzing while it is turning the problem is most likely caused by?
A faulty or worn bearing.
What are some characteristics for a shaded pole motor?
The rotor is made up of laminated steel discs that are pressed on to a common shaft. This shaft has bearings mounted on either end which allows the rotor to spin within the frame of the motor. The shorting bars on the rotor are usually made of aluminium.
What motor does a food mixer use?
Most likely the motor will be a shaded pole induction motor. If the food mixer has a place for brushed on the side of the motor and are oppositely opposed to each other, then it would be a universal motor.
