Zestaw ćwiczeniowo-montażowy maszyny elektryczne Openlab 0.2 kW

The trainer must be a complete set of components for the assembling a large number of rotating electric machines, for dc and ac.

With this trainer it must be possible to assemble at least the following rotating machines:

Shunt, series and compound excited dc motor

Shunt, series and compound excited dc generator

Induction motors: three-phase slip ring and squirrel cage, single-phase repulsion and with capacitor

Dahlander connection

Synchronous motor

The power of the machines must be of about 200W.

(1)Base plate

(2)Supports with bearing

(3)Coupling joints

(4) Flexible coupling

(5) Electronic speed transducer

(6)Assembling screws

(7) Wrenches

(8) DC stator : The DC stator must be composed of a metal frame supporting the laminated magnetic circuit, with 2 main poles and 2 interpoles, and the electrical windings. The sheet iron pack must be 60 mm long, with internal diameter of 80 mm. On the poles the coils must be wound whose terminals are shown on a suitable educational terminal board.

(9) AC stator : The AC stator  must be composed of a metal frame supporting the laminated magnetic circuit, because interested by a flux variable in time, and the electrical winding. The sheet iron pack must be  60 mm long, with internal diameter of 80 mm and external one of 150 mm and it must present 24 half-closed slots inside of which there  must be a double 3-phase winding: the beginnings and the ends of the different phases must be shown outside the stator on a suitable educational terminal board. The winding must be a double layer one of the long coil lap type, with winding span 6 (1÷7). Every slot must contain two coils of 19 turns each of enamelled wire of diameter 1.12 mm.

(10) DC Rotor with commutator: The DC rotor must be composed of a shaft to which the segment commutator must be fixed and of a magnetic sheet iron pack where 20 semi-closed slots suitable to contain the electrical winding must be  set. The sheet iron pack must be 60 mm long, with external diameter of about 80 mm. The winding must be a double layer one of the long coil lap type, with winding span 9 (1÷10).Every slot must contain two coils with two sections of 5+5 turns carried out with enamelled wire of diameter 1.12 mm. The winding must be subordinate to the 40 segments of the commutator on which two brushes supported by a brush holder graze. The brushes must be subordinate to terminals set on two external boards that show the synoptic of the rotor winding.

(11) Brush holder with 2 brushes

(12) AC Cage motor : The squirrel cage rotor must be composed of a shaft to which a pack of magnetic sheet irons is fixed, where the slots suitable to contain the rotor winding must be set. The sheet iron pack must be 60 mm long, with external diameter of about 78 mm. To avoid the phenomenon of the motor crawling in starting phase and to reduce the noise, the slots must be inclined as regards the stator ones. The rotor winding must be composed of the squirrel cage. The cage must be carried out by setting in every rotor slot some conducting bars that are closed in short-circuit at both ends by means of some conducting rings. The rotor winding can be therefore considered a multiphase winding, with a single conductor for pole-phase, so it does not present an its proper pole number but it assumes one that is equal to the stator winding one.

(13) AC Ring motor : The ring rotor must be composed of a shaft to which the collector rings and a magnetic sheet iron pack must be fixed: the iron pack must have 21 semi-closed slots suitable to contain the winding. The sheet iron pack must be 60 mm long, with external diameter of about 78 mm. To avoid a noisy mechanical running the rotor slots must be inclined as regards the stator ones. The rotor winding must be composed of coils and it must be two pole three-phase. The winding must be a double layer one of the long coil lap type, with winding span 9 (1÷10). Every slot must contain two coils of 8 turns each of enamelled wire of diameter 1.5 mm. The winding must be star connected and it must be subordinate to the collector rings while the star centre must be internal and not accessible. The terminals of the rotor winding must be accessible by means of the collector rings on which the bushes supported by a brush holder graze. The brushes must be two for each phase and they must be subordinate to an external terminal board that shows the synoptic of the rotor winding.

(14) Brush holder with 6 brushes

(15) A magnetic probe shall be  foreseen to display the magnetic fields and  for the operator safety a transparent covering shall be provided preventing from the accidental contact with the rotating parts.

(16) A transparent Plexiglas screen for protection.

It must be supplied with manual in English language.

Outputs in AC:

Three-phase voltage 24 V/14 A.

Three-phase voltage 42 V/10 A.

Variable single phase voltage from 0 to 48 V/5 A.

Variable single phase voltage from 0 to 10 V/12 A.

Outputs in DC:

Rectified voltage with three-phase bridge 32 V/14 A.

Rectified voltage with three-phase bridge 42 V/10 A.

Rectified voltage with variable single phase bridge from 0 to 40 V/5 A.

Rectified voltage with variable single phase bridge from 0 to 8 V/12 A.

On the front panel the following elements shall be included:

Mains supply indicator lamp inserted

Indicator lamps of the voltage range

Fixed voltage selector

Dc fixed voltage output switch

Three-phase fixed voltage output switch

Variable voltage selector

Dc/ac voltage changer

Variable voltage output magnetothermic protection

On the back panel the following elements will be included:

Maximum speed protection connector

General differential magnetothermic switch

Fixed voltage output magnetothermic switch

Single phase socket

Supply cord, 3 m long

Three-phase power supply from mains and complete with over-speed protection.

It must be supplied with manual in English language.

The module shall include two voltmeters and two ammeters for measures both in direct and alternating current and an indicator instrument for the reading of the rotation speed.

For the operator’s safety a protection against the maximum speed of the machines under test shall be provided.

Indicators (for speed plus voltmeters and ammeters) on the front panel must be digital type.

Voltmeters: identical type, both for direct and alternating current measures: 0 – 99V

Ammeters: identical type, both for direct and alternating current measures: 0 – 19,99A

Rotation speed: instrument indicating the rotation speed with single scale: 0 – 4000 min-1

Maximum speed protection: on the module back there shall be available a multipolar connector to be eventually connected to the analogue connector set to the supply module described above.

Every time that the rotation speed exceeds the value for which the protection has been foreseen

(higher than 4000 min-1), the measure module shall provide a signal that will be suitable to put out of service the power supply module. The maximum speed protection system must be  particularly suitable to prevent that the direct current motors can reach the escape speed.

On the front panel the following elements shall be included:

Speed measure connector

Speed indicator

2  Voltmeters

2  Ammeters

AC/DC voltage selectors

AC/DC current selectors

On the back panel the following elements shall be included:

Maximum speed protection connector

Socket plug with fuse holder

It must be supplied with manual in English language.

This module shall be planned to carry out resistive and capacitive loads suitable for the generators of the electrical machine laboratory. Besides the same loads, it shall be possible to  use it as starting rheostat both for the three-phase asynchronous motors with winded rotor and for the direct current motors and as starting and running capacitors for the induction single phase motor. This module shall contain both a load rheostat and an excitation rheostat to adjust the field current.

Resistive load R:

Three fixed resistances: 15Ω/ 90 W.

Capacitive load C:

Three fixed capacitors: 80μF/150 V.

Load rheostat:

Fixed resistance from 1 Ω in series to a variable resistance from 0 to 2 Ω.

Maximum current: 8,5A.

Excitation rheostat

Variable resistance from 0 to 80 Ω.

Maximum current: 1 A.

It must be supplied with manual in English language.

It shall consist in a necessary item to connect  the locking device, the brake or the drive motor.

This item must be suitable for locking and rotating the rotor of slip-ring induction motors in order to obtain an induction regulator and phase transformer.

This item shall consist in a rotating light synchronoscope to perform the parallel connection between synchronous generators or between the alternator and the mains. It must be housed in metal box with PVC label.

It must be supplied with manual in English language.

This item shall consist in a switch to change the number of poles on Dahlander motors.

The panel must have 9 bushes + 1 PE and It must be housed in metal box with PVC label.

The unit must be supplied with manual in English language.

This item shall consist in a rotor starter for three-phase slip ring motors and excitation device for synchronization with the mains.

The unit must be housed in metallic box with PVC label.

A schematic diagram must allow an easy operation of the unit.

Power supply: 220 V, 50/60 Hz.

The unit must be supplied with manual  in English language.

This item shall include a smooth roll rotor and a salient pole stator.

It shall be provided with water level, arms, weight and balance weight for measuring the output torque of the motor.

There shall be the possibility of assembling a load cell.

It must be possible to couple the electrical machine with other electrical machines through a hub and spider elastic gear ring in polyurethane. It must be supplied with a hooked module in aluminium with PVC label and safety terminals for the electrical connection. A schematic diagram must be shown on the hooked module. Each machine must be provided with: (1) a side plate to fix the unit with screws to the universal base through 4 holes where the machine must remain suspended (construction form IM B14); (2) a coupling joint with reflecting strip and with diam. 40mm.

The brake  must be supplied with manual in English language

This item must be suitable for three-phase squirrel cage induction motors.

The panel must have 9 bushes + 1 PE

The unit must be supplied with manual in English language.

This item must operate also as generator.

Technical features:

Power:   200 W – Voltage: 42 V

Speed:   3000 rpm

Excitation: 37 V / 0.3 A

It must be possible to couple the electrical machine with other electrical machines through a hub and spider elastic gear ring in polyurethane. It must be supplied with a hooked module in aluminium with PVC label and safety terminals for the electrical connection. A schematic diagram must be shown on the hooked module. Each machine must be provided with: (1) a side plate to fix the unit with screws to the universal base through 4 holes where the machine must remain suspended (construction form IM B14); (2) a coupling joint with reflecting strip and with diam. 40mm.

The item must be supplied with manual in English language

This item must correspond to a set of 4 masks to insert simulated faults in the machines of this laboratory.

The set must include:

• FAULT SIMULATOR FOR A THREE-PHASE CAGE MOTOR

– Short-circuit between two phases

– Break-up of a stator phase

– Break-up of two phases

– Internal short-circuit

• FAULT SIMULATOR FOR A SLIP RING MOTOR

– Short-circuit between two phases

– Break-up of a stator phase

– Internal short-circuit

• FAULT SIMULATOR FOR A SINGLE-PHASE CAPACITOR MOTOR

– Unsuccessful starting of the motor

• FAULT SIMULATOR FOR A COMPOUND EXCITED DC MOTOR

– Unsuccessful starting of the motor

– Break-up of a stator phase

– Shunt excitation circuit reversal

It must be supplied with manual in English language.