HV(hybrid-vehicle) motor & electrical auxiliary equipment

Matching between electric motor and vehicle is good.

  • The electric motor can produce full torque from the zero rotation speed.
  • The internal combustion engine shows a high efficiency around its rated rotation speed.

 In a hybrid vehicle (HV), its built-in electric motor takes care of both start and low-speed running that are rather difficult for its engine to cope with and its engine is used for ordinary operation while maintaining the rated rotation speed capable of achieving good fuel economy. When acceleration is required, the electric motor assists the engine. In the braking mode, the electric motor is used as a generator. All these things help to realize a smooth start acceleration and high fuel efficiency.

 The internal combustion engine has low torque at low rotation speeds. Therefore, it is necessary to give a proper slip to the clutch on MT vehicles and the torque converter on AT vehicles. In addition, a transmission is required for changing the vehicle speed.

 In the case of HV comprised of an internal combustion engine and an electric motor, the engine operation may be stopped when starting or idling the vehicle.

 However, auxiliary equipments need to continuously operate regardless of the condition of the internal combustion engine (for instance, power steering pump, air conditioner compressor, etc.).

 The electrical auxiliary equipments were developed by separating those conventional auxiliary equipments from the engine and installing a small electric motor to each of those auxiliary equipments, based on the idea that the individual auxiliary equipment should operate only when necessary and for a necessary period of time.

An auxiliary equipment represents the equipments assisting not directly but indirectly for vehicle running.

Sawafuji Electric manufactures various types of motor inverters for auxiliary equipments.


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