GT40PCH6

Excitation and power generation

The assembly combines the main generator, an exciter and a permanent-magnet subexciter. The rotating rectifier feeds the main rotor field without a brush-and-slip-ring current path. The main stator supplies the three-phase output. This arrangement separates power generation from the low-power excitation circuits and avoids a sliding electrical contact in the rotor excitation supply. The machine is intended for continuous operation.

GT40PCH6 output and load capability

At the nominal shaft speed of 6,000 rpm, the generator supplies 111 A at a line voltage of 208 V and a frequency of 400 Hz. Rated apparent power is 40 kVA at a power factor of 0.85. The Mi-35M description additionally specifies a maximum 50 kVA / 138.5 A operating condition, limited to 15 percent of the total service-life operating time. It is not the continuous nominal rating.

Regulation, protection and associated units

The Mi-35M generating channel uses a BRN-208M7A voltage regulator, BZU-4A protection/control equipment and a BTT-40P current-transformer block. These components support controlled operation and monitoring of the generator and its feeder. The aircraft electrical network also uses VU-6A rectifiers to obtain DC power from the AC supply; the rectifier is a separate conversion unit, not part of the generator.

Mechanical installation and cooling

In the documented Mi-35M installation, the generator is secured by clamps and receives cooling air from the accessory-drive fan. Rotation is counterclockwise when viewed from the drive end, and the specified maximum mass is 38.8 kg. The catalogue lists other generators and starter-generators separately, including series-specific executions. A neutral Mi-35M overview provides background on the helicopter platform.