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A typical motor start capacitor. A motor capacitor [1] [2] is an electrical capacitor that alters the current to one or more windings of a single-phase alternating-current induction motor to create a rotating magnetic field. [citation needed] There are two common types of motor capacitors, start capacitor and run capacitor (including a dual run ...
Switching of capacitor banks: 60947-4-1 AC-7a: Slightly inductive loads in household appliances: examples: mixers, blenders: 60947-4-1 61095 AC-7b: Motor-loads for household appliances: examples: fans, central vacuum: 60947-4-1 61095 AC-8a: Hermetic refrigerant compressor motor control with manual resetting overloads: 60947-4-1 AC-8b
100/120 Hz for electrolytic capacitors; 50/60 Hz or 100/120 Hz for non-electrolytic capacitors with C R > 10 μF; For supercapacitors a voltage drop method is applied for measuring the capacitance value. . Capacitors are available in geometrically increasing preferred values (E series standards) specified in IEC/EN 60063.
For example, for a four-pole, three-phase motor, = 4 and = = 1,500 RPM (for = 50 Hz) and 1,800 RPM (for = 60 Hz) synchronous speed. The number of magnetic poles, , is the number of north and south poles per phase. For example; a single-phase motor with 3 north and 3 south poles, having 6 poles per phase, is a 6-pole motor.
Analyzing the circuit of the lamp shown in the image, at 50 Hz, the 1.2 μF capacitor has a reactance of 2.653 kΩ. By Ohm's law, the current is limited to 240 V/2653 Ω ≈ 90 mA, assuming that voltage and frequency remain constant. The LEDs are connected in parallel with the 10 μF electrolytic filter capacitor.
A 50% voltage derating is recommended and generally accepted as the industry standard; e.g. a 50V solid tantalum capacitor should never be exposed to an actual application voltage above 25V. Solid tantalum capacitors are very reliable components if the proper care is taken and all design guidelines are carefully followed.
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