Product Description:

The BL-MH201E-20SB is an AC servo motor manufactured by Okuma for the BL Servo Motors series. It is supplied to machine-tool builders and general automation integrators who require precise velocity and position control on linear or rotary axes. When paired with a compatible servo amplifier, the motor translates command signals from the controller into proportional torque, allowing coordinated multi-axis movement in cutting, probing, or material-transfer tasks.

The motor’s continuous phase requirement is 15.7 Arms, so cabling and protection devices must be sized to carry that steady load. Its mechanical shaft can deliver 4 kW of rated output, giving sufficient power for mid-frame spindles, feed screws, or indexers. Transient events such as acceleration spikes are governed by a current limit of 62.5 A, and this ceiling protects the windings while still permitting short bursts of extra torque. The matching servo amplifier must therefore supply up to 75 A without distortion. Initial address selection is performed with Sw1, whose dual-pole setting of 1 2 assigns the node ID expected by Okuma CNC racks so the feedback channel is recognized on power-up.

A board-level jumper is shipped in the Connect position so the encoder and thermal sensor share a common return, which helps prevent ground loops in the drive cabinet. For single-axis installations, Sw2 is preset to positions 1 and 2 selected, with 3 and 4 open, activating the position-control filter and applying factory-calibrated gain values. Dual-axis modules use the combined Sw2/Sw3 pair set to positions 1 and 2 selected, which splits the power bus and routes Hall signals to the second channel without extra wiring. This arrangement allows Okuma to use the same motor type in stand-alone tables or multiplexed gantries.