Motor selection memo
The R88M-1M11K015C-BS2 is an 11 kW cylindrical servo motor from Omron's 1S series, rated for 1500 rpm base speed on a 480 VAC three-phase supply. The built-in holding brake and absolute encoder make it a fit for vertical-axis or high-hold applications where power-off position retention is required. Key and tap on the shaft ensure positive coupling to the load without slipping under torque.
The brake is a spring-set, power-off engaged type — it engages when drive power is removed or the enable signal drops, holding the load in position. For a 11 kW motor on a vertical axis, that brake is sized to hold the full rated torque at standstill; no external mechanical brake is needed. The absolute encoder eliminates the need for a home-search routine on power-up — the position is known immediately, which matters on multi-axis gantries or tool changers where a reference move would waste cycle time.
Panel fit — the brake vs. non-brake sibling
The closest peer is the R88M-1M11K015C-S2 — identical frame, same 11 kW / 1500 rpm / 480 VAC / absolute encoder spec, but without the brake. The -BS2 adds roughly 40 mm to the overall length and requires a brake power connection from the drive (Omron 1S drives have a dedicated brake output). If the original panel was wired for the -S2, dropping in the -BS2 means adding a brake cable and verifying the drive's brake transistor is enabled. Mechanically, the mounting flange and shaft dimensions are identical, so no re-machining is needed.