English to Afrikaans Tech/Engineering Engineering (general) Wind turbines

Large wind turbines are equipped with pitch drive motors that provide pitch control at each blade root.

"Pitch drive motor" and "pitch motor" are used alternately in the text, guess in Afrikaans one can also leave the "drive" bit out to prevent a very long and clumsy composite noun. I have found "pitch" = "steek" in this helicopter glossary:

http://www.docstoc.com/docs/70154149/English-Afrikaans-Gloss...

I also understand what is meant, it is the motor that regulates the "pitch" of the rotor blades and thus the angle of attack of the wind on the blades, but would that then simply be a "steekmotor" in Afrikaans?

I also found this English-Dutch KudoZ discussion in which "hellingshoek" is used for pitch. That also sounds like a plausible translation to me... Does anyone have experience with rotor blades and what these kind of motors would be called in the field in Afrikaans?

Thanks in advance for any tips and suggestions!