bagian 4 motor step dan bldc pdf
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Klasifikasi Motor
Electric Motors
Alternating Current (AC)Motors
Direct Current (DC)Motors
Synchronous Induction
Three-PhaseSingle-Phase
Self ExcitedSeparatelyExcited
Series ShuntCompound
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Klasifikasi
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PCB Motor
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Motor Universal
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Motor Universal
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SCR Control (for DC Motor)
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Motor AC Induksi
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Motor Step (Stepper Motor)Jenis 1: Rotor Permanen Magnet
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Motor Step (Stepper Motor)Jenis 2: Variable Reluctance
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Motor Step (Stepper Motor)Jenis 3: PM-hybrid motor
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Stator Rotor
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Motor Step: Unipolar
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Motor Step: Bipolar
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Motor Step (Stepper Motor)Cara Eksitasi 1: One-phase ON, Full Step
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One-phase On, Full Step, Torque = T, Step = 90o
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Motor Step (Stepper Motor)Cara Eksitasi 2: Two-phase ON, Full Step
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Two-phase On, Full Step, Torque = 1,4T, Step = 90o
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Motor Step (Stepper Motor)Cara Eksitasi 3: Half Step
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Half Step, Torque= T sd 1,4T, Step 45o
Stepping Sequence
• Full step sequenceshowing how binarynumbers can controlthe motor
• Half stepsequence ofbinary controlnumbers
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Full Stepping
• Animation shows how coils are energizedfor full steps
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Motor Step (Stepper Motor)Urutan kontrol 1: Two-phase On, Full Step
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Motor Step (Stepper Motor)Urutan Kontrol 2: Half Step
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Motor Step : Rangkaian Kontrol
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Motor Step: Torque vs Speed
Contoh Pemakaian Motor StepFilm Advance
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Telescope Drive
Labeling Machine
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Moving Positioning System
Rotating Tube Cutter
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Motor Step (Stepper Motor)Video 1: Kontrol PosisiVideo 2: Kontrol kecepatan (dan posisi) tanpa slip
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BLDC Motor
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BLDC Motor = AC Servoo A BLDC motor: the stator is a classic three-phase stator like that of an
induction motor the rotor has permanent magnets
oMotor torque, speed, position, current are controlled by amicrocontroller (MCU) or digital signal controller (DSC).
oSupports Hall sensor (commutated), encoder, resolver, andsensorless control functions.
oAplication: fans, pumps, HVAC blowers and compressors,computer disk drives and peripherals, appliances, robotics,servo systems, traction control, sewing machines, andtreadmills.
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BLDC Motor = AC ServooBRUSH LESS DC (BLDC) / AC SERVO MOTORS are a type
of synchronous motor. This means the magnetic field generatedby the stator and the magnetic filed generated by the rotor rotateat the same frequency.
oBRUSH LESS DC (BLDC) / AC SERVO MOTORS do notexperience the ‘slip' that is normally seen in induction motors.
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BLDC Motor = AC Servo
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DC Motor vs BLDC Motor
DC Motor BLDC Motor
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Essential Elements of a Typical BLDC Motor
BLDC Control
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How BLDC Works
• Halls Sensors sense theposition of the coils
• The Decoder Circuit turnsappropriate switches onand off
• The voltage through thespecific coils turns the motor
Images courtesy of Servo Magnetics(http://www.servomag.com/flash/2-pole/2pole-bldc-motor.html)
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Quadrants of Operation
Cur
rent
(Tor
que)
Voltage(Speed)
First Quadrantpositive speed-positive torque
“forward-accelerating”
IIIIII IV
Second Quadrantnegative speed-positive torque
“reverse-braking”
Third Quadrantnegative speed - negative torque
“reverse-accelerating”Fourth Quadrant
Positive speed - negative torque“forward-braking”
Generating Motoring
Motoring Generating
Advantages• Increased Reliablilty & Efficiency• Longer Life• Elimination of Sparks from Commutator• Reduced Friction• Faster Rate of Voltage & Current• Precision Voltage & Current Applied to
Field Coils
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Applications• Low Power
– Consumer Electronics– Medical Field
• High Power– Industrial Machinery– Vehicles– Airplanes
Disadvantages• Requires Complex Drive Circuitry
• Requires additional Sensors
• Higher Cost
• Some designs require manual labor(Hand wound Stator Coils)
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BLDC Motor: Torque vs Speed
21st Century electric motor will be BLDC / AC Servo
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BLDC Motor Applications
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BLDC Motor Applications
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BLDC Motor Applications
Brushless DC motorsat GMRT Rayshed
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BLDC Motor (AC Servo)Video 1: Servo Motor with Replacable EncoderVideo 2: Servo Motor RepairVideo 3: Stepper or Servo?