table fan
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The document summarizes the key parts of a table fan, including the fan motor, main body, fan blades, regulator, and oscillating mechanism. The fan motor is typically 60-70 watts, uses a 4-pole induction motor with a starting and running winding in a capacitor start capacitor run design. The oscillating mechanism uses a mechanical design to partially rotate the fan in a semi-circle at 4-5 times per minute. The fan regulator controls speed by inserting more or less resistance, and the fan blades are usually made of steel or aluminum with an aerodynamic 3-4 blade design.
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This document discusses commutation of SCRs (silicon controlled rectifiers). Commutation is the process of turning off an SCR. There are natural and forced commutation methods. Natural commutation occurs automatically in AC when the load current drops below the holding current or the SCR becomes reverse biased. Forced commutation is required in DC applications using an extra circuit to forcefully turn off the SCR. Commutation can occur through reducing the current below the holding current level or applying a reverse voltage. There are different classes of commutation depending on the method used.
RATINGS OF SCR
This document discusses the key ratings of silicon controlled rectifiers (SCRs) that must be considered for reliable operation. It outlines voltage ratings like peak repetitive forward blocking voltage and peak working reverse voltage. It also covers current ratings like maximum average current rating and di/dt rating. Thermal ratings like the I2t rating and maximum junction temperature are provided. The document emphasizes that SCRs must operate within these specified ratings to avoid damage.
SCR COMMUTATION PART 2
This document discusses different types of commutation for turning off SCRs (thyristors). It describes Class A commutation which uses a resonant load to achieve zero voltage turn-off, Class B which uses self-commutation via the intrinsic timing of the SCR, and Class C which uses one SCR to turn off another. Class D uses an auxiliary SCR to apply reverse voltage commutation across the main SCR. Class E applies a reverse voltage pulse and Class F utilizes the negative half of an AC cycle for natural commutation without extra circuitry. In summary, the document outlines six common classes of commutation techniques for turning off SCRs either through reducing current or applying a reverse voltage.
MOUNTING OF SCR
The document discusses five different mounting techniques for silicon controlled rectifiers (SCRs) used in power electronics based on capacity level: lead mounting for low capacity, stud mounting for medium-high capacity, bolt mounting for medium-high capacity, press fit mounting for higher capacity, and press pack/disc/hockey pack mounting for very high capacity applications where multiple SCRs are sandwiched between heat sink plates for cooling.
SCR PROTECTION PART 2
SCRs require protection from over voltage, over current, and high rates of change of voltage and current. This is because SCRs are sensitive devices that can be damaged by transient overloads or abnormal operating conditions. Various protection techniques are used like snubber circuits, surge suppressors, fuses, contactors, and gate protection circuits to prevent damage to SCRs in power electronic applications and ensure reliable system operation.
SCR PROTECTION
The document discusses protection methods for SCRs (silicon controlled rectifiers). SCRs are sensitive to over voltage, over current, temperature changes, and gate malfunctions. Protection is needed to prevent damage from high dv/dt, di/dt, over voltage events like lightning surges, and over current. Methods include using capacitors to reduce dv/dt, snubber circuits for di/dt, nonlinear surge suppressors like varistors, selenium suppressors, and avalanche diodes to divert over voltage surges, and thermal protection for over current.
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