motor fundamental

Motor Fundamental

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Motor Fundamental

• Motor Outline

• Stepper Motor

• Servo Motor

Agenda

Motor Outline

• DC Motor/Synchronous Motor / Induction Motor

Motor Fundamental

• Stepper Motor

Agenda

*Advantage*Disadvantage*Type of Stepper Motors*Theory of Operation*Switching Sequence*Linear Stepper Motors*Application

Stepper Motor

• Low Cost

• Excellent Torque Holding

• Low Maintenance(Brushless)

• Very Rugged (Any Environment)

• No Tuning Required

Advantage

Stepper Motor

• Rough Performance at Low Speed

• Consume Current Regardless of Load

• Limited Sizes Available

• Noisy

• Torque Decreases with speed

• Stall or Lose Position Running without a Control Loop

Disadvantage

Stepper Motor

• Type of Stepper Motors*Permanent Magnet*Variable Reluctance*Hybrid

Stepper Motor

• Brushless

• Relative Low Torque

• Teeth Offset

• Thin-Disk Rotor (Stator Offset?)

Permanent Magnet

• No Permanent Magnet

• Numbers of Steps : (Ns - Nr)/(Ns*Nr) Ns: number of teeth in stator core Nr: number of teeth in rotor core

• Single Stack / Multi Stack

Stepper MotorVariable-Reluctance Stepper Motor

• Consist of two pieces of soft iron, round PM

• Bifilar

Stepper MotorHybrid

Stepper Motor

• Unipolar

• Bipolar

• Free Wheeling

Drive

Stepper MotorTheory of Operation

Switching Sequence

Stepper Motor

• Full Step

Stepper Motor

• Half Step

Switching Sequence

Stepper Motor

• Micro StepSwitching Sequence

Linear Stepper Motors

Stepper Motor

• Coil Wind

• Transport Wafer

• Printer

• Wafer Slicing

Application

Servo

• With Feedback

• SCR / Transistor Issue

• Cooling Fan

Servo

Servo

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motor fundamental

Business

stepper motor half step

stepper motor micro

low speed

number of teeth

low maintenancebrushless

stator core nr

disk rotor stator offset

speed stall