BDU-50A Okuma
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The Okuma BDU-50A is a servomotor drive from the BDU Servomotor Drives series and features a 300 VDC DC bus voltage, with a 3-phase, 220 VAC PCB input. It has a flux vector drive topology and supports up to 6 axes per DCPS. The drive offers 33 A output current and uses a digital RCON command signal along with an OSP position encoder.
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Product Description:
The BDU-50A is a servo amplifier manufactured by Okuma as part of the BDU Servomotor Drives series. Installed inside machine-tool control cabinets, the drive conditions the DC power and modulation needed to run a single servomotor axis under commands from the host controller. By converting incoming AC supply to regulated DC and implementing vector control, it supports precise axis positioning and repeatable motion in automated production equipment. Its cabinet-mounted format also suits machine layouts that keep the power electronics close to the numerical control hardware.
In operation, the drive accepts a 220 VAC supply on a three-phase printed-circuit backplane and rectifies it into a stabilized DC link of 300 VDC. From this bus, it can deliver up to 33 A of continuous output current in a regulated Flux Vector scheme, enabling high torque accuracy even at low motor speeds. The output stage sends controlled pulses to the connected motor windings, and current feedback is sampled to maintain the commanded torque profile. The single-motor design simplifies thermal management, while the DC architecture reduces switching losses compared with older AC output amplifiers. These operating limits help determine suitable motor matching and the protective devices required upstream.
Protective monitoring trips the unit when the DC link rises above 430 VDC or falls below 220 VDC, preventing component overstress and undervoltage misfires. Motion commands arrive on a Digital (RCON) interface and position feedback returns through an OSP Position Encoder, closing the numerical control loop without external converters. A Distributed Control Power Supply can feed as many as 6 axes, yet each BDU-50A services 1 motor, which helps keep axis faults localized. The housing measures 150 mm high, 420 mm wide, and 220 mm deep, allowing dense rack installation beside sibling amplifiers and making efficient use of cabinet space.
Frequently Asked Questions about BDU-50A:
Q: What type of command signal does the BDU-50A use?
A: The BDU-50A servomotor drive uses a digital RCON command signal for precise control.
Q: What is the output current of the BDU-50A drive?
A: The BDU-50A provides an output current of 33 A for driving motors.
Q: What is the DC bus voltage supported by the BDU-50A?
A: This drive operates with a DC bus voltage of 300 VDC.
Q: How many axes can the BDU-50A drive per DCPS?
A: The BDU-50A supports a maximum of six axes per DC power supply.
Q: How many motors can the BDU-50A amplifier control at once?
A: Each amplifier in the BDU-50A is designed to drive a single motor.
