OMNIREL OM510 Datasheet

OMC510

DSP-BASED MOTOR CONTROLLER FOR

THREE-PHASE BRUSHLESS DC MOTORS

FEATURES / BENEFITS

•Embedded Motor Control DSP (ADMCF328) improves higher level system integration and flexibility

•7A phase current (cycle-by-cycle current limit)

•Hall Effect sensor based; sensorless control optional for improved reliability

•Logic supplies (+15V/+5V) generated onboard, eliminating external parts

•Serial port for isolated RS-232 interface allows system level control

•Direction and velocity control

•2.5 Inch diameter to fit inside motor housing

APPLICATIONS

•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 • Leominster MA 01453 • Phone: [phone] • Fax: [phone] •	www.omnirel.com

OMC510

SIMPLIFIED BLOCK DIAGRAM

		+	28V
PC
DSP	6		M
Control
&
Interface
	HV IC Driver
			Hall Effect Sensor
			Outputs
	Hall Inputs
	Bus Voltage Sense	Current Sense
	Current Sense	-

		Va
	Phase
3	Voltage	Vb
	Sense	Vc

Rev 03 09/27/00	2
205 Crawford Street • Leominster MA 01453 • Phone: [phone] • Fax: [phone] •	www.omnirel.com

									OMC510
CHARACTERISTICS
			Maximum Ratings
	Peak Motor Supply Voltage				V pk			32
	Input Voltage (Analog/Digital)				V		-0.3 to +3.3 / -0.3 to +5.3
	Operating Ambient Temperature				°C			0 to +85
	Storage Temperature				°C			-20 to +125
	Nominal Power Ratings			Module Thermal & Mechanical Characteristics
	Motor Supply Voltage	VDC	28	Thermal Resistance			°C/W		55
				(Junction to Ambient)
	Continuous Current	ARMS	7	Max. Ambient			°C		85
				Temperature
	Current Overload	%	200 for 3 Sec;	Dimensions (Ø)			in./mm		2.50 / 63.5
			150 for 1 min.

PERFORMANCE SPECIFICATIONS

Speed Regulation:	+ 2 RPM
Speed Accuracy:	+ 0.1 %
Velocity Bandwidth:	> 100 Hz
Constant Torque/
Speed Range:	50:1
Starting Torque:	Start into locked rotor
Torque Response:	1.5 mSec

Rev 03 09/27/00	3
205 Crawford Street • Leominster MA 01453 • Phone: [phone] • Fax: [phone] •	www.omnirel.com