Sensorless driver for brushless DC motors
An
Electric Motor Applications product story
Edited by the Engineeringtalk editorial team
Jan 22, 2003
New and exclusive to Electric Motor Applications is the latest controller from the Industrial Motor Division of Aveox.
New and exclusive to Electric Motor Applications is the latest controller from the Industrial Motor Division of Aveox.
Developed originally for "down hole" use in geophysical and oil exploration applications, the card is 12in long and has a width of 1.05in, so that it will fit within the industry standard 1.6875in-diameter pressure housing.
It is possible, however, to reconfigure the drive card for suitable OEM applications.
Input voltage range is 20 to 400V and typical power handling capacity is 600W.
Maximum operating temperature is 160C and controlled speed range is typically from 200 to 5000rev/min.
The drive card provides a smooth, controllable startup without the need for Hall-effect devices or resolver on the motor.
A tachometer output is provided for revolution measurement.
There are several modes of operation.
In automatic startup mode, by connecting the external speed set and start/run wires to +12V, the motor will start when the minimum startup voltage is reached and will ramp up to full speed, which depends on the motor voltage.
Depending on the application, rampup may take several seconds.
In switched startup mode, if minimum motor voltage is present, connecting the start/run line to a 5 to 12V supply will initiate the startup sequence.
Applying a voltage of less than 12V to external speed set line will control the speed of the motor by pulsewidth modulation of the current in the output transistors.
Several parameters may be factory programmed, such as: minimum voltage for startup; shutdown voltage; motor speed ramp-up rate at startup; motor speed ramp-down rate at shutdown; and tachometer output divide by n (for example to obtain 1pulse/rev).
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