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What is a centrifugal force tachometer?
THis type of tachometre is also knowm as flyball tachometre. The basic principle of this tachometre is that the centrifugal force is directly proportional to the shaft speed . Two fly-balls whose weights are small are used in this tachometre and hence it is called flyball tachometre . These two balls are used in developing centrifugal force. In this case the spring is compressed as function of shaft speed. It is noted that one end of the spring is connected to the sleeve and moved smoothly on spindle . The position of the sleeve is indicated as the speed of rotating shaft. The motion of the sleeve is amplified and it indicates the speed with the help of a pointer on scale. This type of tachometer is also used for linear speed measurements , with necessary attachments mounted on the spindle . For obtaining speed over wide range , this type of tachometer uses multiple range units. A gear train is used between the fly balls to complete the change from one range to another range . The draw back ofthe tachometer is overspeed which seriously damage the instrument . This type of tachometers are widely used for measuring of shaft speeds upto 40×10^3 rpm . Its accaracy is + or - 1% of full scale.
What are the three main part of single-phase motors?
The main parts are the stator and the rotor.After that depends on the type of single phase motor. This includes capacitors (start and/or run),centrifugal switch (stationary and rotary) Also there are usually two windings,a start and a run winding. In its most basic form the start and run winding are connected together at one end of the windings (common) the other end of the run winding connected via a centrifugal switch and/or run capacitor to the other end of the start winding. Power is supplies to the run winding terminals. The start capacitor is fitted in series with the centrifugal switch, allowing it to be disconnected once rotation speed is reached.
Do you prefer a centrifugal compressor over a screw compressor?
Screw chiller running with a male & female blade,Centrifugual chiller running with an impeller. Screw chiller are very reliable on more load like more than 200 tr ,its less consumption comapare to other chillers.
What happens to the speed of motor while the excitation current is decreasing?
Assuming there is no mechanical load, as the speed approaches the synchronous speed the slip decreases and the current induced in the rotor also decreases. The stator coil begins to approximate a pure inductor and that causes the current to fall. In the steady state the power drawn is used to overcome friction in the bearings and windage only.
What is A Double Coupling?
A double coupling refers to a mechanism or system that involves two distinct couplings working together to transmit motion or force between components. This concept is often used in engineering and mechanical systems to enhance performance, improve efficiency, or provide redundancy. In some contexts, double coupling can also indicate a configuration where two separate drives or motors are used to ensure reliability in critical applications. Overall, it enhances the functionality and robustness of the system.
