0
What else can I help you with?
Given 220 volts 15 amperes 700 rpm and 0.8 ohms what speed will it run if a resistance is connected in series with supply voltage assume the motor is taking the same current?
Most probably, it won't even run or it will run for a while and then burn out, a motor that run 700rpm is an 8 pole induction motor, the only way to get it to run slower or faster is to change the supply frequency, say you want it to run at 350 rpm you have to change the supply frequency from 50Hz to 25Hz
What is the Effect of reduced the frequency from supply frequency on induction motor?
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.
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 is rotor frequency?
The stator's coils in a (induction) motor produce a (first) magnetic field pattern, rotating at the supply frequency, F(s). This flux is cut by the rotor conductors because it's turning relatively slower than the rotating field (slip, s, is not zero). Induced currents are therefore creating a (second) induced magnetic field pattern around the rotor's condutors which is revolving at a relative (rotor) frequency F(r). F(r) = s * F(s) This is sometimes called slip frequency.
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
What is the Frequency Supply in UAE?
Supply Frequency in UAE is 50Hz
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 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.
What will happen if inductor connected with DC supply?
i think in case of dc supply there will not be any induction
Write the equation for the synchronous speed of a three phase squirrel cage induction motor?
The equation is 60F/N where F is the supply frequency, usually 50 or 60 Hz, and N is the number of pole-pairs.
What happens at a low frequency?
At low frequencies, sound waves have longer wavelengths and carry less energy. In terms of hearing, low-frequency sounds like a deep bass are perceived as being lower in pitch. In terms of electronics, low-frequency signals are often used for power supply and slower data transmission.
