"恒速操纵器" can be translated into English as "constant-speed controller" or "constant-velocity controller", depending on the specific context and the nature of the system it's applied to.
"Constant-speed controller" is more commonly used in contexts where the focus is on maintaining a steady rotational or linear speed, such as in motors or engines.
"Constant-velocity controller" might be used in situations where the emphasis is on maintaining a consistent velocity, which could apply to both linear and rotational motion, though it's less commonly encountered in everyday technical discourse compared to "constant-speed controller."
In most engineering and technical applications, "constant-speed controller" would be the preferred and more widely understood term.