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Applied Control SystemsStepper Motors
Stepper Motor / Electro magnet
RotorStatorCoils
StatorsRotorCross Section of a Stepper Motor
Four Steps per revolution i.e. 90 deg. steps.Full Step Operation
Eight steps per. revolution i.e. 45 deg. steps.
Half Step Operation
Winding number 1Winding number 2One step6 pole rotor
How many steps are required for one complete revolution?Six pole rotor, two electro magnets.
The top electromagnet (1) is turned on, attracting the nearest teeth of a gear-shaped iron rotor. With the teeth aligned to electromagnet 1, they will be slightly offset from electromagnet 2 Practical Stepper motor operation
The bottom electromagnet (3) is energized; another 3.6 rotation occurs.
Stepping Motor to move read-write headStepper motor applications
Paper feeder on printersCNC lathesStepper motorsStepper motor applications
RotorStator coilsCNC Stepping Motor
Advantages:-Low cost for control achievedRuggednessSimplicity of constructionCan operate in an open loop control systemLow maintenanceLess likely to stall or slipWill work in any environment
Disadvantages:-Require a dedicated control circuitUse more current than D.C. motorsHigh torque output achieved at low speeds
Advantages / Disadvantages
+CWCCWControl sequence to turn a stepper motor
Step 10011Step 21010Step 31100Step 40101
Servo Motor Detail+ 5VActuatorReduction gearPosition feedbackPotentiometer(closed loop system)Small electric DC motor