Product Description:

The WCHG-150A-135A power module is produced by Okuma for the WCHG Winding Changeover Spindle Motors series. Installed inside a machining center, it converts plant AC into multiple regulated DC rails that energize the spindle motor during low-speed torque winding and high-speed finish winding phases in changeover spindle applications. By combining the auxiliary, main, and secondary supplies in one heat-sink assembly, the unit simplifies cabinet wiring and provides stable voltage for motion control sequences in automated turning, milling, and grinding lines where rapid spindle transitions are common.

The auxiliary section accepts an input of 100 to 240 VAC, which suits global single-phase service feeds. From that range, it delivers 2.5 A at a continuous output of 60 W for control-side devices. All three regulated rails share a common output level of 24 VDC, so sensor power, control logic, and spindle actuators operate from the same bus. Thermal management is handled by a heat sink rated at 550 W/10 K; this means 550 W of loss raises the base temperature by only 10 K, helping protect nearby electronics. The main and secondary converters use a twin-tap input of 100/200 VAC, allowing connection to either side of a center-tapped transformer without reconfiguration.

Under load, the main rail can source up to 27 A and provide a peak of 600 W for the spindle’s high-demand acceleration cycles before the drive switches windings. The secondary rail supports auxiliary motion axes with 14 A and a continuous capacity of 300 W. Both sections draw from the twin-tap AC feed but are regulated independently, so a fault on one rail does not collapse the other. By distributing current across dedicated outputs while maintaining the same DC bus level, the module allows the machine controller to separate tooling loads, encoder feedback, and solenoid circuits, which helps keep voltage ripple low during rapid changeovers and sharp spindle acceleration events.