Assertion: motor's speed | /r/HasProperty | required
Facets:
Source sentences:
text: An alternate design, called the wound rotor, is used when variable speed is required.
text: In the fractional horsepower range, most synchronous motors are used where precise constant speed is required.
text: In the fractional horsepower range, most synchronous motors are used where precise constant speed is required.
text: Series motors are not suitable when a constant speed is required.