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New Magnetic Levitation System
 
  Description
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Overview
  Magnetic levitation is a classical technology in mechatronics. It combines electromagnetism and electronics technology, control technology, signal processing, mechanics, and dynamics. The technology is widely used in many industry fields such as magnetic levitation train, magnetic suspension bearing, miniature transmission equipment, measuring instrument, robotic wrist, magnetic levitation educational system, etc. The Magnetic Levitation System (Model: GML2001) from Googoltech provides an ideal experiment platform for research and tutorial for undergraduate and graduate students studying classical control theory and modern control theory. Apart from its modern designed appearance, laser sensor is also applied as feedback signal to measure moving distance of the floating ball accurately. In addition, the Magnetic Levitation body (Model: GML2001A) can be provided as a standalone experimental device for any third party or self-designed controller.
System Features
 
  • Students can thoroughly comprehend PID tuning, root locus tuning, frequency domain method tuning, status feedback control method with Matlab software platform experiment course.
  • Via optional analog control system, by observing and comprehending the structure of control system and the characteristic of driving module, students can construct embedded magnetic levitation controller by combining the analog control system with DSP, ARM, MCU, etc. The embedded discrete control algorithm can be perfected by comparing control results.
  • Students can select components such as photoelectric, ultrasonic, infra-red distance detecting sensor to build up the magnetic levitation body; and construct complete magnetic levitation system with self-designed embedded controller.
  • Laser sensor is used as feedback signal. Through the experiments, the non-linearity of the system can be directly viewed by the distribution of the electromagnetic field.
Control Principle
 
  • When the ball moves up and down vertically under the electromagnet, the laser sensor right below the ball detects the distance between the apex of the ball and the lowest part of the electromagnet. It converts the voltage signal to the controller. The controller calculates the output current level of the electromagnet coils. The emerged magnetic force can levitate the ball under the electromagnetic stably in any arbitrary position within the range.
  • Due to the characteristic of the mathematical modeling of the device that the composed unit is unstable without the controller, a corresponding controller must be designed to stabilize the system. As the linearization has to be carried out around a non-zero operating point, it is therefore very challenging.
Experiment Content
 
  • Based on Matlab platform:
  • System modeling experiment and analysis;
  • PID tuning & PID controller design;
  • Root locus tuning, frequency domain method tuning, and status feedback.
  • Based on analog control system:
  • PID tuning & analog control experiments.
   
Matlab Control Interface
 
  • Use Root Locus Control as an example (support Matlab version 2012b or above):
Control Configurations
 
  • (I) Digital Control
  • The standard model (GML2001) uses PCI Data acquisition card to communicate with the Magnetic levitation system drive.
  • (II) Analog Control
  • 1. The analog control box model GAES1001 directly uses amplifier to control the system by two control schemes: current control and voltage.
  • 2. Any other third party or self developed controller.
       
Specifications :
 

Items

Specifications

Body Dimensions:

210 x 150 x 280 mm (L x W x H)

Control Box:

220 x 200 x 75 mm (L x W xH)

Coil Resistance:

13.8 [

Turns:

2,450

Coil Inductance:

135 mH

Core Size:

X=20 mm , H=94mm

Control Distance:

1-30mm (steel ball = 94g , X = 45mm)

Laser Sensor:

Class 2 Red Semiconductor Laser, 655nm, 1mW max

Power Supply:

220 VAC

System Weight

< 8 Kg

 

Ordering Guide :
 

Model

      Description

Items

 

GML2001

Magnetic Levitation System

AML-MB-2001

- Magnetic Levitation Body

AML-EB-2001

- Control box with connecting cable

A-DA-1711

- Data Acquisition Card PCI

S-UP-MAT

- Googol Simulink experiments platform

GAES1001

*Optional Analog Control Module

GML2001A

Magnetic Levitation System (Body only)

AML-MB-2001

- Magnetic Levitation Body

AML-MB-2001B

- Connecting Cable (loose end)

GAES1001

*Optional Analog Control Module or Self Developed Controller

 

 

 
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