Electrical Actuators , Drive systems and
Motion control
Electrical Motors
DC
DC servo,
AC
Stepper Motor
Drive System
Open-Loop Positioning System
Close-Loop Positioning System
Motion Control
Motor driver
Numerical Control (NC)
ENT471 Automation
, Electrical Motor
Electric motors
Electrical motor converts electrical power into mechanical power.
The motor consist two basic components, stator and rotor
Stator – ring shaped stationary
component
Rotor- cylindrical part that rotate inside
the stator
Rotor assembled around shaft,
supported by bearing.
Shaft can be coupled to machinery
components such as
•Gears
•Pulley
•Lead screw
•Spindle
ENT471 Automation
, DC Motor
Motor type:
•DC motor and DC servomotors
•AC motors and AC servomotors
•Stepper motors
•Linear motor
DC motor
•Powered by constant current and voltage
•Two type: 1) Brushed DC Motor 2)Brushless DC Motor
•Brushed DC motor used commutator as rotary switching device.
- Commutator rotate with the rotor and pick up current from set of carbon brushed.
- Disadvantage- result in arcing, worn brushes and maintenance problem.
•Brushless DC motor used solid state circuit as switching device.
- Advantage – reducing inertia of rotor assembly and higher speed operation.
Two reason DC motor
-Convenience of using DC power e.g car battery supply
- torque-speed relationships are attractive in many application compare to AC
motor ENT471 Automation
, DC servomotor
DC servomotor
-Used feedback loop to achieve speed control
• The torque produced by motor and torque by the load must be balanced.
• Operating point – amount of torque in steady state operation
• Advantage of DC servo
Ability to deliver a very high torque at starting velocity of zero
Variable speed motor and bi-directional
ENT471 Automation
Motion control
Electrical Motors
DC
DC servo,
AC
Stepper Motor
Drive System
Open-Loop Positioning System
Close-Loop Positioning System
Motion Control
Motor driver
Numerical Control (NC)
ENT471 Automation
, Electrical Motor
Electric motors
Electrical motor converts electrical power into mechanical power.
The motor consist two basic components, stator and rotor
Stator – ring shaped stationary
component
Rotor- cylindrical part that rotate inside
the stator
Rotor assembled around shaft,
supported by bearing.
Shaft can be coupled to machinery
components such as
•Gears
•Pulley
•Lead screw
•Spindle
ENT471 Automation
, DC Motor
Motor type:
•DC motor and DC servomotors
•AC motors and AC servomotors
•Stepper motors
•Linear motor
DC motor
•Powered by constant current and voltage
•Two type: 1) Brushed DC Motor 2)Brushless DC Motor
•Brushed DC motor used commutator as rotary switching device.
- Commutator rotate with the rotor and pick up current from set of carbon brushed.
- Disadvantage- result in arcing, worn brushes and maintenance problem.
•Brushless DC motor used solid state circuit as switching device.
- Advantage – reducing inertia of rotor assembly and higher speed operation.
Two reason DC motor
-Convenience of using DC power e.g car battery supply
- torque-speed relationships are attractive in many application compare to AC
motor ENT471 Automation
, DC servomotor
DC servomotor
-Used feedback loop to achieve speed control
• The torque produced by motor and torque by the load must be balanced.
• Operating point – amount of torque in steady state operation
• Advantage of DC servo
Ability to deliver a very high torque at starting velocity of zero
Variable speed motor and bi-directional
ENT471 Automation
