BL-MC200J-20SN-A Okuma
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The Okuma BL-MC200J-20SN-A is a 3-phase servo motor from the BL Servo Motors series with a continuous output of 4 kW and an OKUMA ER encoder. It has a permanent magnet field type, 8 poles, and a stall torque of 21 Newton-meters. This motor is rated for 14.7 Amps and 157 Volts, with a rated speed of 2000 min^-1.
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Product Description:
The BL-MC200J-20SN-A is a rotary servo motor manufactured by Okuma within the BL Servo Motors series. It is intended for precision drive axes that require closed-loop speed and position control, such as tool changers, feed drives, or pick-and-place mechanisms. When paired with an Okuma servo amplifier and feedback network, the motor delivers rapid acceleration and repeatable positioning. Its compact size and dynamic response support integration into CNC equipment and general automation systems where accurate motion is essential to cycle performance.
Continuous output is rated at 4 kW, indicating the mechanical power that can be supplied continuously under rated operating conditions. During continuous operation, the winding draws a nominal 14.7 A from the matched amplifier, which must be considered when selecting conductors and protective devices. The terminal voltage is rated at 157 V, and the connected drive must provide a compatible output. At the reference speed of 2000 rpm, the motor produces torque while the integrated Okuma ER incremental encoder sends high-resolution position data to the controller. A stall torque of 21 N·m allows the motor to hold loads at zero speed, while the eight-pole rotor supports high torque density and smooth rotation.
The motor uses a permanent-magnet magnetic circuit, eliminating the need for rotor field excitation and reducing associated electrical losses. Power is supplied through a three-phase connection, allowing balanced stator currents and supporting vector-based motor control. The electrical frequency reaches 133 Hz at the rated speed, so the drive output must accommodate this fundamental frequency. Internally, the stator coils use a delta connection, with each winding connected between two line conductors. This winding arrangement works with the selected rotor geometry and matched servo amplifier to provide controlled torque across the operating speed range.
