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A cold start is an attempt to start a vehicle's engine when ambient temperatures are much lower than its normal operating temperature. [1] A cold start can be difficult for an engine due to higher viscosity of oil and fuel in cold temperatures.
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]
Yuasa, a producer of 12-volt car batteries, says: “Cold temperatures directly affect the performance of car batteries. In fact, at zero degrees celsius a battery will lose about 30 per cent of ...
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]
As alternator voltage falls below 13.8 volts, the lead-acid storage battery increasingly picks up electrical load. During virtually all running conditions, including normal idle conditions, the alternator supplies primary electrical power. Some systems disable alternator field (rotor) power during wide-open throttle conditions.
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.
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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 ...