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# Electric Motors and Motion Control - PowerPoint PPT Presentation

Electric Motors and Motion Control. Ara Knaian. Motors. Motors convert electrical energy to mechanical energy Motors make things move. LINEAR. DC BRUSH. INDUCTION. ELECTROSTATIC. STEPPER. UNIVERSAL. How a DC Motor Works. Brushes. How a DC Motor Works. Motor Modeling.

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### Electric Motors and Motion Control

Ara Knaian

• Motors convert electrical energy to mechanical energy

• Motors make things move

LINEAR

DC BRUSH

INDUCTION

ELECTROSTATIC

STEPPER

UNIVERSAL

Brushes

• Is this motor big enough?

• Will this thing move?

• What gear ratio should I use?

• How big should my power supply be?

• How hot will it get?

• How fast can I machine?

• What materials can I machine?

Voltage and Current In

Torque and Speed Out

Heat Out

Power In = Power Out

Torque is proportional to current

In an ideal motor (R = 0), speed is proportional to voltage

At constant voltage, speed goes down as torque goes up

Like Low Voltage (slow)

Like High Voltage (fast)

Mechanical System

Controller

Motor

Encoder

Set Point (desired position, velocity)

Measured Output (position/velocity)

e.g. PID

Practical Motor Controller Block Diagram

Mechanical System

H Bridge

Motor

Encoder

Limit Switch

Microcontroller