The environment
motors and modules
The assembly environment contains three shelves and a table. Around it, you will find other shelves full of the most diverse equipment, whose brief description you can find below.
INSTRUMENTATION
Some motors components
Rotors: rotating part of the motor. There are three types available: squirrel cage, commutator and ring.
Eletromagnetic brake: device responsible for applying an opposite torque to the motor, to brake it
Coupling joint: element responsible for mechanically connecting the rotor to the electromagnetic brake.
Speed Transducer: device responsible for generate a eletric signal depending on the motor speed.
Block and rotation system: locks the motor or turns it manually by means of a crank.
Magnetic probe: equipment that shows if the magnetic field is acting on the motor shaft
Brush and brush holder: devices used to supply the rotor winding (armature)
Other motor component
Stator: fixed part of the motor. Two types are available: AC stator and DC stator.
Auxiliary components
Suports: here are 5 supports, of which four are common and one is to be used with the brake. This one has a load cell, which can be used with the torque meter to determine the torque applied by the brake to the motor.
Eletronic Modules
AC/DC - PS1: three-phase DC source
AC/DC - PS2: single-phase DC source
Wattmeter: device to measure power.
Speed Meter: device to measure speed.
Torque Meter: device to measure torque.
Amperemeter: device to measure current.
Voltmeter: device to measure voltage.
Starting Rheostat and Resistive Load: device that uses a rheostat controlled by a potentiometer to start the motor with a given current. It also has a set of resistors that can be associated in different ways by using a selector switch
Pole Changing Unit: device that controls the number of motor poles through a selector switch
Excitation Rheostat and Capacitive Load: works analogously to the starting rheostat and resistive load, but the resistance of the rheostat is greater. Also, the load is capacitive
Starting Rheostat and Synchronizer: like the starting rheostat and resistive load, this device also controls the motor starting current by a potentiometer. However, its selector has two more positions: one that shortcircuits the armature windings and the other that supplies the windings with a low voltage, and if the voltage is as recommended in the experiments, the motor operates at synchronous speed (same as the power frequency)
Star Delta Starter: loses the motor in star or delta, depending on the position of a selector switch.
Oscilloscope: provides the time graph of the variable connected to its input
Rotating Light Synchronoscope: is a device used to connect motors in parallel. For this, the voltage in the stator of the motor must be the nominal one and it must be operating close to the synchronous speed. These conditions are identified when LED H1 is off and LEDs H2 and H3 are on. At this moment, you must turn its switch.
WHAT DO STUDENTS LEARN IN PRACTICE
Sensors, transducers, signal modules;
Instrumentation electrical connections;
Instrumentation setup;
Motor setup;
Measurements procedures;
Studying the characteristics of each assembly;
Electromechanical energy conversion concepts.