Tram

Overview

The Tram is a low-floor articulated light-rail vehicle. It is built from three carbody modules linked by two joints, riding on two powered bogies and one centre bogie, drawing current from a roof pantograph through traction equipment to three-phase motors. Onboard energy storage, plug doors, a driver cab, roof HVAC, the interior fit-out, the control network, passenger information, couplers and sanders complete the vehicle. The low floor and articulation let a long vehicle negotiate tight street curves while keeping a step-free boarding height.

Articulated carbody

The Articulated Carbody is three Carbody Module sections joined by two Articulation Joint units. Each module is a Module Underframe aluminium floor frame with two Sidewall Panel sides, a Roof Panel skin and six Window Pane panes. Each joint combines a Turntable Ring slewing ring with a Gangway Bellows gangway and a Fastener Set, so passengers can walk through while the sections rotate relative to each other.

Bogies

Two Motor Bogie assemblies drive the tram. Each has a Bogie Frame, two Traction Motor units, two Resilient Wheelset sets, four Air Spring secondary springs, four Rubber Suspension Element primary elements, two Disc Brake Unit units and two Magnetic Track Brake magnetic brakes. Each Traction Motor is a three-phase machine with a Stator Assembly, Rotor Assembly, a Helical Gear Pair final drive and Ball Bearing support. Each Resilient Wheelset carries a Wheelset Axle, two Resilient Wheel noise-damped wheels and Ball Bearing journals. The Center Bogie is an unpowered carrying bogie under the middle module, sharing the frame, wheelsets, springs and disc brakes.

Power collection and traction

Current is collected by the Pantograph, a roof single-arm unit with a Collector Head carbon strip, a Pantograph Arm lifting linkage and an insulated Pantograph Base Frame. The Traction Equipment container holds a Traction Inverter, a Line Filter Choke choke and a Braking Resistor grid. The inverter is an IGBT VVVF drive built from six IGBT Power Module switches, two DC-Link Capacitor capacitors and a Bare PCB gate driver. Onboard the Energy Storage Unit unit recovers braking energy with a Supercapacitor Pack, an auxiliary array of Li-ion Cell, 21700 cells and a BMS Board.

Doors and cab

Each Plug-Sliding Door is a double-leaf unit with two Door Leaf panels, a Door Operator, and a Wire Bundle. The operator drives the leaves with a Blower Motor, an Microcontroller and Connector terminations. The Driver Cab holds a Seat Assembly, a Driver Console and two LCD Panel displays. The console centres on a Master Controller hand controller on a Bare PCB with four Relay outputs.

HVAC, interior and control

Three HVAC Roof Unit roof units each carry a HVAC Compressor, two Blower Motor fans and a Heat Exchanger Coil coil. The Interior Fit-Out fits out the cabin with Seat Assembly seating, sixteen Grab Pole stanchions, a Floor Covering and twenty-four LED Light Strip strips. The Train Control & Management control system networks the subsystems with a Compute SoC Module, four Microcontroller I/O nodes, two Bare PCB boards and eight Connector terminations.

Passenger information, couplers and sanders

The Passenger Info System system runs six LCD Panel displays, eight Camera Module CCTV cameras, eight PA Speaker speakers and a Wire Bundle. Each Coupler combines a Coupler Head knuckle with a Draft Gear absorber. Four Sander Unit units lay sand at the motor axles to improve wheel-rail adhesion in poor conditions.