Kwamfuta ko Hukuma na Tsawon Karamin Rike

Plugging (Reverse Current Braking) in DC Motors

A cikin plugging (reverse current braking), maimaitar karamin terminal ko karamin supply polarity na motoci mai zama ko shunt motor yana gurbin daidai idan an yi waɗanda motoci ta shiga. Wannan yana haɗa da supply voltage V da induced back EMF E_b suka sauki a kan hagu. Saboda haka, effective voltage a kan armature a lokacin plugging yana bazu V + E_b—kusan supply voltage—da ya gurbi ƙarin armature da ya taimaka wajen samun ƙarin tsirriyar tsirriyar. An saka external current-limiting resistor a kan series da armature don ƙara ƙarin zuwa ingantaccen daraja.

Diagram na ƙungiyoyi da characteristics na motoci mai zama a cikin plugging ana nuna a wannan figure:

Notation:

• V: Supply voltage

• R_b: External braking resistance

• I_a: Armature current

• I_f: Field current

Diagram na ƙungiyoyi da operational characteristics na motoci series a cikin plugging ana nuna a wannan figure:

Principles and Considerations of Plugging Braking

Don motoci series, plugging braking ana samu ne a cikin gurbin terminal armature ko field terminals—amma ba duka biyu a lokacin ɗaya, saboda gurbin biyu yana haɗa da zama na ƙasa.

Notably, braking torque ba za su rasa a zero speed. Don zama load, motoci yana bukata a ƙare waɗanda supply a kan zero speed ko kusan; ba haka, zai zama a cikin yawan ƙarfin ƙarshe. Centrifugal switches suna amfani da su don wannan ƙare.

Plugging (reverse current braking) yana da kyau da inefficiency: kuma ɗaya da take ƙara power daga load, take ƙara source-supplied power a kan braking resistors.

Applications of Plugging Braking

Amma da takarda:

• Elevator control systems

• Rolling mill machinery

• Printing presses

• Machine tools and other industrial equipment