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Fans
Pumps
Compressors
DESCRIPTION
The OMC510 is a DSP-based three-phase brushless DC motor controller intended to replace the analog
controller to improve system integration, efficiency, flexibility, and reliability while reducing the overall
system cost. The standard OMC510 is configured for commutation via Hall effect sensor feedback. In this
configuration, the Hall effect sensor outputs provide discrete absolute rotor position for commutation. The
Hall effect sensor outputs are fed into the control port, level shifted onboard from 15V to 5V, then fed
directly into the DSP. Based on this information, velocity is determined. Alternatively, the OMC510 can be
configured for commutation via sensorless control. Three resistor divider networks are provided onboard for
back EMF measurements. In this configuration, the inactive winding is used to measure the back EMF, and
based on these measurements, estimates of position and velocity are derived. Consult the factory for details.
The OMC510 requires a single ended 28V supply for operation. The logic voltage supplies (15V and 5V) are
derived onboard. The OMC510 will accommodate either an analog or digital command input. For the latter,
a serial port is provided onboard to interface with an isolated RS-232 communications port. The OMC510
provides direction control as well as current limit for over-current protection.
The OMC510 is a 2.5 inch diameter circuit board assembly designed for small size and low cost, and it is
ideal for installation inside a motor housing. The assembly process includes chip-on-board technology for the
driver and power stages to maximize the power density and surface mount technology for the control stage.
The small size, low cost and performance of the OMC510 make it an ideal control solution for applications
including fans, pumps and compressors.
Rev 03 09/27/00
1
205 Crawford Street
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Leominster MA 01453
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Phone: 978 534 5776
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Fax: 978 537 4246
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