BDU-75D Okuma
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The Okuma BDU-75D is part of the BDU Servomotor Drives series and supports a BL motor with AC drive technology. It operates with a DC bus voltage of 300 VDC, uses analog command signals from an ECP board, and accepts a 3-phase 220 VAC input. The drive features absolute position encoder feedback and is designed for positioning duty in ATC magazine and APC pallets.
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Product Description:
The Okuma BDU-75D belongs to the BDU Servomotor Drives series and functions as a dedicated amplifier for brushless axes in CNC machinery. By converting controller commands into regulated phase currents, it drives a single motor during high-cycle positioning tasks such as ATC magazine rotation and APC pallet shuttling. The unit is arranged in four modular sections, which help organize the internal layout and support heat control inside the cabinet. A row of seven DCPS status LEDs also gives a clear visual indication of operating state and fault conditions while the machine is running.
The amplifier receives an analog velocity or torque reference from the ECP board, and it processes that signal with carrier-based PWM modulation to shape the output waveform. Incoming mains power is a three-phase supply at 220 VAC, and it is rectified to a stabilized DC link of 300 VDC for energy storage and rapid current response. Okuma uses AC drive technology for this model so it can match the operating characteristics of the connected servomotor. Only one axis is supported per amplifier, which allows the control loop to remain dedicated to that motor without sharing current regulation with another channel.
Protective limits are set so the inverter trips if the DC bus rises above 430 VDC during regeneration or falls below 220 VDC during a brownout. The drive is intended for a brushless motor equipped with an absolute position encoder, allowing the control system to recover exact axis position after power loss without a homing cycle. Because this amplifier is used on magazine and pallet axes, its control behavior is suited to smooth indexing and repeated start-stop motion rather than continuous contouring. The analog command interface also helps keep response direct for short positioning moves used in automatic tool and part handling.
Frequently Asked Questions about BDU-75D:
Q: What is the DC bus voltage of the BDU-75D servomotor drive?
A: The BDU-75D operates with a DC bus voltage of 300 VDC.
Q: What modulation technique does the BDU-75D employ?
A: This drive uses PWM modulation for motor control.
Q: How many motors can the BDU-75D amplifier support?
A: One BL type motor can be connected per BDU-75D amplifier.
Q: What type of position feedback does the BDU-75D provide?
A: An absolute position encoder is used for position feedback on this model.
Q: Where does the BDU-75D receive its command signals from?
A: The BDU-75D receives command signals from an ECP board.
