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What is critical speed of a motor?

What is critical speed of a motor?

Critical speed is the resonance frequency at which a shaft will resonate if it is excited by a force acting on the shaft. Unbalanced magnetic pull due to finite number of stator and rotor slots.

What is the critical speed in turbine?

Critical speed of the turbine is the rotor speed at which natural frequency of the assembled rotor (rotor shaft with discs, blades, shrouding strips etc in assembled condition) becomes equal to the operating speed. This is usually a expressed as a range (critical speed range).

What is the critical speed range?

Critical speed or barred speed range is a speed at which a slow speed engine will suffer damaging vibration and has to be manoevred through as quickly as possible.

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What do you mean by critical speed of DC machine?

What is Critical Speed of DC Shunt Generator? Critical speed is defined as the speed at which the given shunt field resistance is equal to the critical resistance. It is the speed at which the shunt generator just fails to build up its voltage without any external resistance in the field circuit. It is denoted by Nc.

What is meant by critical speed of a shaft which are the factors affecting it?

Critical speed depends upon the magnitude and location of the shaft unbalance, the length of the shaft, its diameter, and the kind of bearing support.

What is critical speed in mechanical vibration?

Critical speed is the speed at which unwanted vibration happens when a vessel is rotating. The crushing of particles in a traditional mill is generally accomplished by rotating the mill near the critical speed. Running a mixer in excess of the critical speed can cause destructive mechanical vibrations.

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What is Critical Speed of a DC shunt generator also explain the condition for voltage development?

This speed n2 is hence called Critical Speed. Thus Critical Speed is that speed at which the DC Shunt Generator just fails to buil up voltage with no external resistance in the field circuit.

What is meant by critical speed of a DC shunt generator?

What does critical speed mean?

Definition of ‘critical speed’. critical speed in Chemical Engineering. Critical speed is the speed at which unwanted vibration happens when a vessel is rotating. The crushing of particles in a traditional mill is generally accomplished by rotating the mill near the critical speed.

What is critical speed in a ball mill?

Ball Mill Critical Speed. The mill speed is typically defined as the percent of the Theoretical Critical Speed, often abbreviated as \%Cs. The Theoretical Critical Speed (Cs) of rotation is the speed (in RPM) at which an infinitely small particle will cling to the inside of the liners for a complete revolution.

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What is critical speed of a turbine?

Critical speed of the turbine is the rotor speed at which natural frequency of the assembled rotor (rotor shaft with discs, blades, shrouding strips etc in assembled condition) becomes equal to the operating speed. This is usually a expressed as a range (critical speed range). critical speed may be angular(torsional) or lateral.

What is critical speed of a SAG mill?

Ball and SAG Mills are driven in practice at a speed corresponding to 60-81\% of the critical speed, the choice of speed being influenced by economical considerations. Within that range the power is nearly proportional to the speed. Mill rotating speed impacts grinding rates.