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What is the Effect of reduced the frequency from supply frequency on induction motor?
Wiki User
∙ 14y ago
The main difference will be the motor's torque will be decreased, potentially making it undersized for its' purpose. The motor's speed will also be decreased since n=(120f)/P.
Wiki User
∙ 14y ago
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What happens to the speed of an induction motor if the supply frequency is increased?
The supply frequency determines the synchronous speed of the machine -i.e. the speed of the naturally-rotating field within the airgap. As motors typically run around 5% below this speed, the rotor's speed would increase.
Does the value of the exciting current of your 3-phase motor depend on the rotor speed?
An induction motor has no excitation, so the question is about a synchronous motor. The rotor speed is determined by the supply frequency. For a given supply frequency and mechanical load, the excitation current can be adjusted to give the best power factor.
What are the three factors that effect the electrical parameters of a op-amp?
Supply voltage , temperature , frequency are factors that effect the electrical parameters of opamp
What is the Frequency Supply in UAE?
Supply Frequency in UAE is 50Hz
How do you control the speed of the induction motor by using cycle stealing method?
The speed of an induction motor depend on the frequency of the supply voltage 60Hz in the USA and 50Hz in most other country's and the speed can only be controlled by varying the frequency, the way to do it is to rectify the AC to DC and convert it back to AC but with another frequency. I'm planing to post a project on my website soon, so look out for it at http://www.patenttrade.net
How is the pulsation torque of a universal motor minimised?
A single-phase motor provides a torque which pulsates at double the supply frequency. The effect is reduced by the moment of inertia of the rotating parts of the motor. If it is still excessive for a particular application, a flywheel can be placed on the shaft.
What is a cycloconverter?
A cycloconverter or a cycloinverter converts an AC waveform, such as the mains supply, to another AC waveform of a lower frequency, synthesizing the output waveform from segments of the AC supply without an intermediate direct-current link.
When induction motor is switched on the rotor frequency is?
The induction motor rotor has different frequency compared to it's stator. The rotor has slip ( s ) frequency. slip = ( Synchronous speed - rotor speed ) / Synchronous speed Synchronous speed = ( 120 * f ) / P where f = supply frequency to the stator. p = no of poles rotor speed is the actual speed the motor is running. Frequency in the rotor = slip * frequency in the stator At starting rotor speed is zero, so slip is one. Let us take the supply frequency is 50 Hz, then rotor frequency is also 50 Hz at starting. The motor attains speed and runs with its full speed at a point of time. Then let us take the slip is 0.04 then the rotor frequency will be 2 Hz.
Why induction motor runs slightly slower than supply frequency?
if the motor is at synchronous frequency there is no current induced in the shorted windings in the rotor so at no load its slightly less. if you drive the motor faster than synchronous speed it becomes a generator
How do the change in supply voltage and frequency affect the performance of a 3 phase induction motor?
The higher the frequency, the faster the motor will spin. This results in better cooling, so the motor can be designed smaller. There are other effects as well, but perhaps this will get you started.
Why you have to connect DC supply to the induction motor?
To start an induction motor we have to excite field. The excitation is done by connecting the DC supply to the field winding's.
Difference between linear power supply and switch mode power supply?
a linear power supply the noise or ripple can be reduced to mv. However it is bulky heavy and inefficient A switching power supply it is easier to filter its output but the hi frequency noise and spikes are not that ease to get rid off. The weight and size can be greatly reduced and the efficiency greatly improved
