Which devices are used to control the generator frequency on large jets?

Which devices are used to control the generator frequency on large jets?

• A. PWM controller
• B. CSD or IDG
• C. Solid state regulator
• D. Integrator

Answer: (B)

To keep generator frequency stable on large jets, the aircraft uses a constant-speed drive or an integrated drive generator. The CSD is connected to the engine accessory gearbox and adjusts the coupling so the generator rotates at nearly a constant speed, even as the engine speed changes. Because the AC frequency is tied to generator speed, this keeps the output at the required 400 Hz for the aircraft’s electrical system. Modern jets often use an integrated drive generator, which combines the generator and the speed-control mechanism in one unit to deliver the same constant frequency. PWM controllers regulate power delivery to loads or motors, not the generator’s frequency. A solid-state regulator handles voltage regulation but doesn’t fix the system frequency. An integrator isn’t a device used to control generator frequency in aircraft electrical systems.

To keep generator frequency stable on large jets, the aircraft uses a constant-speed drive or an integrated drive generator. The CSD is connected to the engine accessory gearbox and adjusts the coupling so the generator rotates at nearly a constant speed, even as the engine speed changes. Because the AC frequency is tied to generator speed, this keeps the output at the required 400 Hz for the aircraft’s electrical system. Modern jets often use an integrated drive generator, which combines the generator and the speed-control mechanism in one unit to deliver the same constant frequency.

PWM controllers regulate power delivery to loads or motors, not the generator’s frequency. A solid-state regulator handles voltage regulation but doesn’t fix the system frequency. An integrator isn’t a device used to control generator frequency in aircraft electrical systems.