1. Traction electrical equipment
for 100% low floor tramcar 1

2. History of tramcar traction equipment in SKODA
Count Valdštejn founds the engineering plant
Emil Škoda becomes the owner
setting up of a new electrical engineering plan in Pilsen
launching the manufacture of tram motors
manufacture of the first AC traction drive
first tramcar with asynchronous traction motor and IGBT converter
foundation of ŠKODA ELECTRIC s.r.o
first tramcar with synchronous traction motor with permanent magnets 2

3. Traction Equipment Basic features
State of the art components
Modular design
100% low floor design
Fully swiveling bogies
Individual drive of every single vehicle wheel
Permanent magnet synchronous motor
High torque of the motor – direct drive (no need of the gearbox)
Significantly reduced noise
Independent electric brake 3

4. 15T - ForCity 250 tramcars for Prague – Czech Republic
3 section vehicle
100% adhesion
15TR - ForCity 20 tramcars for Riga – Latvia
3 section vehicle
75% adhesion (one non-driven bogie)
Fully air-conditioned passenger area 4

5. 15T - ForCity Components by Skoda Electric
16x Synchronous traction motor with permanent magnets
4x Traction unit for traction motor supply
1x Static converter for auxiliary drives and battery charger
1x 24 volt battery 5

6. Traction unit TJ1.1 6

7. Traction unit Basic features
Inverters for an independent supply of four traction motors (one bogie)
Input circuits for regenerative and resistive braking
Contactors between inverters and traction motors
Microprocessor control units
Heat exchanger and cooling pump for traction motor cooling integrated in the traction unit
Forced air cooled brake resistor integrated in the traction unit 7

8. Traction unit 3D model
Dimensions: 1500x1500x498mm
Weight: 481kg 8

9. Block diagram 9

10. Traction unit Basic parameters
Technical data of one inverter (4 inverters in the unit)
Maximum power in drive mode kVA
Nominal input voltage or 750V
Output voltage 3AC V
Output frequency – 280 Hz
Switching frequency 4kHz 10

11. Characteristic of the drive
Torque of one traction motor
Power of one traction motor
Brake 11

12. Traction motor 12

13. Traction motor Basic features
Permanent magnet synchronous motor
High torque – 2270Nm
Water cooling
Integrated position sensor for propulsion control and speed sensor for brake system 13

14. Traction motor 3D model 14

15. Traction motor Basic parameters
Maximum power (drive mode) 46.6kW
Voltage x 392 V
Maximum current A
Nominal current A
Nominal speed RPM
Maximum speed RPM
Class of insulation H
Protection class IP54 15

16. STATIC CONVERTER SM36.1 16

17. Features and Parameters
Static converter
Features and Parameters
Provides supply of tram auxiliary drives and for battery charging
Converters are equipped with output sinus filter
IGBT technology
Output three-phase AC voltage rating 3 AC 400 V ± 4%
Rated power of each section kVA
Number of sections 2
Output one-phase AC voltage rating 2 AC 230 V
Range of output DC voltage V – 30 V
Maximum output DC current A 17

18. Static converter 3D model
Dimensions: 1450x1520x482mm
Weight: 386kg 18

19. BATTERY ENCLOSURE BS1.1 19

20. Battery enclosure Features and parameters
24V battery
Maintenance free design
Temperature sensor on the battery for a temperature charge compensation
Mechanically operated battery disconnect switch
Circuit breaker for an external charger
Capacity of accumulator battery Ah
DC voltage rating V DC + 25 %, -30% 20

21. Battery enclosure 3D model
Dimensions: 1450x470x504mm
Weight: 282kg 21

22. Possible modifications of the equipment according to customer individual requirements
Various number of driven bogies
Each traction unit corresponds with one driven bogie
Reversed polarity of the trolley
Change of electrical connection without changes of mechanical design
Emergency drive of the traction inverter from the LV battery
Installation of additional circuits without significant changes of mechanical desig
Fully air-conditioned passenger area
Static converter with increased output power 22

23. Advantages compared to conventional solution
Traction Equipment
Advantages compared to conventional solution
Equipment designed for 100% low floor vehicle with fully swiveling bogies
Compact design of permanent magnet synchronous motor
High torque of the motor – direct drive (no need of the gearbox)
Significantly reduced noise 23