Author: T.K. Mani Keraia, India email: epsilon@giasmd01.vsnl.net.in

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Author: T.K. Mani Keraia, India email: epsilon@giasmd01.vsnl.net.in

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Speed Regulator Motors Used Domestic
Author: T.K. Mani Keraia, India email: epsilon@giasmd01.vsnl.net.in
Maximum running time protection. Variable speed operation push buttons. Motor protection against overheat. Higher efficiency even speed. Controller takes less power, cost.
INTRODUCTION:
wide variety motors household applications. These motors coming under category (fractional horse power). Various types FHPs that their applications shown: TYPE APPLICATION
APPLICATION OPERATION:
PICmicrocontroller senses zero crossing point input supply GP3. Here simple circuit employed. This gets triggered half cycles supply. receiving trigger, controller calculates exact point applying gating pulse which acting switch. Once triggered, following full half cycle conduction occurs motors power that half cycle. controller selects period cycles (this value must properly selected depending mass type load type motor, larger values heavy motor) passes fixed number cycles motor. rest allowed. This operation continues. number cycles conduction determined speed values stored SPEED register. speed value increased pressing button increased pressing button. more cycles allowed, average speed increased vice versa. Release above buttons causes running present speed.
Induction Motors Fans, Pumps, food processors AC/DC Series motors Hysteresis motors Kitchen mixers, vacuum cleaners, grinders, sewing machines Fans, turn tables, etc.
above types motors need speed regulation according requirements must protected against overloading. motors must protected from overheating over run. circuit suggested aims increase decrease speed motor pushing appropriate buttons. also monitors temperature shutdown condition sensed external hardware switch motor. maximum continuous running time also programmable. Since controller controls speed using integral cycle controlling zero cross switching there less switching same time suitable variety motors powering from
Protection
motor protection needs external circuit monitor faulty condition. vary from simple thermal trip sophisticated temperature current monitors. case logic input controller sufficient trip motor. Once tripped, motor cannot started again immediately. Restarting occurs after predetermined cooling period.
Facilities that incorporated are:
variety motors AC/DC motors. Integral cycle controller reduction RFI/EMI.
Microchip Technology Incorporated, been granted nonexclusive, worldwide license reproduce, publish distribute submitted materials, either original edited form. author affirmed that this work original, unpublished work that he/she owns rights such work. property rights, such patents, copyrights trademarks remain with author.
1998 Microchip Technology Inc.
DS40160A/7_003-page
CIRCUIT DIAGRAM MOTOR SPEED REGULATOR
PHASE 230V NUTRAL 1000 3.3V OVERLOAD ON/OFF 12-0-12 7805??
PIC12C5XX PIC125XX
PULSE TRANSFORMER MOTOR
BRIDGE RECIFIER
PHASE
NUTRAL
DS40160A/7_003-page
1998 Microchip Technology Inc.

Author: T.K. Mani Keraia, India email: epsilon@giasmd01.vsnl.net.in

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