Transportation Systems

Propulsion inverters (VVVF Inverter)

Propulsion inverters (VVVF* inverters) are the control devices that convert the train’s power source to a suitable type of power to drive the traction motors.
These inverters convert incoming DC power to AC power as well as control the amount of power (voltage and frequency) being supplied in accordance with the train’s speed, etc. In addition, these inverters are also capable of regenerating power from the motors as the train decelerates.
In this way, propulsion inverters help the train smoothly launch, stop, accelerate, and decelerate.

Features

  • Smooth ride comfort: Sensorless vector control is utilized to increase response to the traction motors and adherence to the tracks while keeping wheel spinning and slipping to a minimum. These inverters do not even require motor speed sensors (PG sensors).
  • Low maintenance: Equipped with a device monitor in the control unit, whereby making the operation status continuously transparent and providing for a log of failures. These features help to reduce the amount of maintenance.
  • Power savings: These inverters make it possible to use both generative (resistor consumption) and regenerative (power restoration to the overhead power lines) methods of train control (braking).

* VVVF stands for variable voltage variable frequency.

Major Products

Natural Cooling VVVF Inverter

Mounting location Under floor
Enclosure shape Integrated long enclosure (2 bank)
Application Suburban trains,
commuter trains, subways
Specification
sample
Line voltage 1500 V DC
Control unit 1C4M (2 bank)
Control capacity 175 kW traction motor × 4
(2 bank)
Mounting location Under floor
Enclosure shape Integrated long enclosure (2 bank) (high-speed circuit breaker/unit switches) (2 bank)
Application Suburban trains,
commuter trains,
subways
Specification
sample
Line voltage 1500 V DC
Control unit 1C4M (2 bank)
Control capacity 200 kW traction motor × 2 (2 bank)

Forced-air Cooling VVVF Inverter

Mounting location Under floor
Enclosure shape Long enclosure (contained brake chopper built in)
Application LRVs, automated people movers (APMs), subways
Specification
sample
Line voltage 750 V DC
Control unit 1C2M
Control capacity 1150 kW traction motor × 2
Mounting location Roof
Enclosure shape Integrated enclosure (high-speed circuit breakers/unit switches/filter reactor/brake chopper contained)
Application Low-floored LRVs
Specification
sample
Line voltage 600 V DC
Control unit 1C1M (2 bank)
Line voltage 100 kW traction motor (2 bank)

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