do ac motors have commutator?
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In AC induction motor, two windings in stator create a rotating magnetic field, which makes the rotor rotate. So there is no need of supply to rotor and hence no commutator. However, in series motor, available for both AC and DC supply, commutators are used to supply current to rotor windings.
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The two main types of AC motors are induction motors and synchronous motors. The induction motor (or asynchronous motor) always relies on a small difference in speed between the stator rotating magnetic field and the rotor shaft speed called slip to induce rotor current in the rotor AC winding.
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Consequently, AC motors are less efficient than DC motors. In fact, the DC motor is 30% more efficient than AC motors due to the secondary magnetic field being generated from the permanent magnets rather than copper windings.
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In addition to the rotor and stator, a generator has a collector assembly (usually consisting of collector slip rings, brushes, and brush holders). DC flows from the exciter, through the negative brush and slip ring, to the rotor field poles. ... When the rotor is rotated, AC is induced in the stator.
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However, the process they use is different. An AC generator creates an alternating current that periodically reverses direction. But in a DC generator, a direct current flows in one direction. In an AC generator, the coil through which current flows is fixed and the magnet usually moves.
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The ac motors are meant to operate a specific point on a performance curve. ... Consequently, AC motors are less efficient than DC motors. In fact, the DC motor is 30% more efficient than AC motors due to the secondary magnetic field being generated from the permanent magnets rather than copper windings.
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Most ceiling fans, as well as most household appliances, use AC motors, as AC is the type of current distributed by power companies. ... With DC fans, the direct (AC) power source, connects to a transformer which converts the power to DC.
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AC motors function by being connected directly to a power source. ... With DC fans, the direct (AC) power source, connects to a transformer which converts the power to DC. The effect is that it decreases the amount of power used by only using a direct current instead of the alternating current.
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Yes. A DC series motor is capable of running when supplied with a single phase AC supply. This is because the torque, which varies as the product of the armature and field current, is always positive. Thus, a positive average torque causes the motor to rotate.
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AC motors function by being connected directly to a power source. This power source is what creates the moment of force required to rotate the motor's rotor. With DC fans, the direct (AC) power source, connects to a transformer which converts the power to DC.
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The armature is the part of an AC generator in which output voltage is produced. The prime mover is the component that is used to drive the AC generator. The rotor of an AC generator is the part that is driven by the prime mover and that rotates. The stator of an AC generator is the part that is stationary.
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Motor has a dc current as an input and provides mechanical output. Generator has a mechanical energy as an input and provides DC current as an output. Motor uses cummulators for changing the magnetic field polarity whereas in generator they are used to cancel the polarization effect.
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Electronically commutated (EC) motors are electric motors powered by direct-current (DC) electricity and having electronic commutation systems, rather than mechanical commutators and brushes.
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AC vs. DC power: AC motors will be less expensive and more likely to include a chain drive, while DC motors will be most expensive and more likely to feature a belt drive. DC motors tend to be more expensive, and they're found more commonly on belt-driven garage door openers.
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Synchronous motor, like induction motor (ie asynchronous motors), is a common AC motor. ... Synchronous generator, that is, an alternator with the same rotor speed as the rotating magnetic field of the stator. According to the structure, it can be divided into two types: a rotating armature and a rotating magnetic field.
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AC induction motors have no brushes and have a much longer life expectancy. DC motor speed is controlled by varying the armature current, while AC motor speed control is achieved by varying the frequency of the alternating current, often with a variable frequency drive(VFD).
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MOTORS AC Brushless Motors AC brushless motors use the induction of a rotating magnetic field in the stator to turn the rotor and stator at the same rate. Like DC motors, these are permanent-magnet synchronous motors, or PMSMs, that rely upon magnets built into the rotor.