The Mitsubishi HC-KFS43B-S9 is an AC servo motor fitted with a spring-loaded safety brake, rated for 24V DC operation and drawing 7.9 W. The brake engages on power loss, holding the motor shaft stationary — critical for vertical-axis loads or any axis where a coast-down would cause a crash. Encoder resolution is 131072 pulses per revolution, supporting both absolute and incremental position feedback.
The 20000-cycle brake life means this motor is sized for applications with moderate hold-cycle counts — think a pick-and-place Z-axis or a tool-changer spindle lock, not a high-cycle clamp station where the brake cycles every few seconds. Brake looseness at the shaft is specified at 0.12 to 1.2 degrees, which is typical for a spring-set brake; if your position tolerance after stop is tighter than that, the brake alone won't hold it — you need the servo loop to park the shaft before the brake sets.
Integration notes
The 24V DC brake coil is separate from the motor power windings — wire it through a dedicated safety relay or contactor that drops out on E-stop. The encoder output is a standard A/B/Z incremental plus absolute position data; check your drive's encoder input compatibility for 131072 ppr resolution. Rated voltage is 24V DC; verify your brake supply is regulated — a rectified AC supply without filtering can cause chatter.