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The torsional deflection of a simple cylinder cannot radiate efficiently acoustic noise, but with particular boundary conditions the stator can radiate acoustic noise under torque ripple excitation. [8] Structure-borne noise can also be generated by torque ripple when rotor shaft line vibrations propagate to the frame [9] and shaft line.
Stalling also happens when the driver forgets to depress the clutch and/or change to neutral while coming to a stop. [3] Stalling can be dangerous, especially in heavy traffic. [1] A car fitted with an automatic transmission could also have its engine stalled when the vehicle is travelling in the opposite direction to the selected gear. [4]
The smaller, enclosed fans produce less noise, particularly at higher machine speeds. [8] Alternators can also be water-cooled in cars. Larger vehicles may have field coil alternators similar to larger machines. [9] The windings of a 3 phase alternator may be connected using either the delta or star (wye) connection regime set-up. [10]
If one machine is slightly out of phase it will pull into step with the others but, if the phase difference is large, there will be heavy cross-currents which can cause voltage fluctuations and, in extreme cases, damage to the machines. From top to bottom: synchroscope, voltmeter, frequency meter. When the two systems are synchronized, the ...
Stall torque is the torque produced by a mechanical device whose output rotational speed is zero. It may also mean the torque load that causes the output rotational speed of a device to become zero, i.e., to cause stalling. Electric motors, steam engines and hydrodynamic transmissions are all capable of developing torque when stalled.
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