Pitch motors have a tough job. They spin around in a turbine hub and must work when it’s hot and cold. They are often on six-month maintenance intervals usually to check their brushes. It’s no wonder they konk-out after a few years.
Engineers at Moog have recognized the problem and so devised a line of ac synchronous electromagnetic servo motors for the job. When combined with the Wind Turbine Servo Drive in the Moog Pitch System, it offers higher performance and additional safety. The new Pitch Servo Motor offers max reliability and low maintenance because of an innovative design. When mounted properly, one spokesman for the company says the motors can last the life of the turbine.
Moog says it built the motor to meet the requirements of corrosion class C5M (to DIN 12944 Standards). With wind proof electrical connectors, this motor comes in hot and cold climate versions and one for offshore. This motor is said to work reliability under some of the most demanding environmental conditions including high vibration, extreme temperatures, and high humidity. The motor has no fan and a higher peak performance than a dc motor. For the series, torques range from 28 to 65 Nm.
The company points to these advantages:
- Long life and low maintenance – the ac synchronous motor is said to have a long life and low maintenance costs because it minimizes mechanical wear.
- Protection in the event of grid loss – The compact motor has a high-power density to reach required torques and speeds needed for safe feathering.
- ExtraSafety – Sensorless control means the Moog Pitch Servo Drive can control the motor in the event that position information is lost from the Servo motor’s resolver.
Filed Under: News, O&M