Title :
A new control IC for switched reluctance motor drives
Author :
Miller, T.J.E. ; Cossar, C. ; Anderson, D.
Author_Institution :
Glasgow Univ., UK
Abstract :
A new control IC for switched reluctance motor drives is described. The LMB1008 contains all the necessary analog and digital control to drive a switched reluctance motor in both forward and reverse rotation with stepwise-adjustable firing angles. Both motoring and braking modes are provided. The internal commutation logic can operate with shaft position signals derived from either 3 or 2 Hall or optical sensors; or in `straight-through´ mode with no shaft position sensors. For closed-loop speed control an internal tacho (frequency-to-voltage converter), oscillator, error amplifier, and PWM generator are provided. A comparator is also provided for excess current detection and current limiting. The IC is implemented in National Semiconductor´s BLOCCS process technology. Supply voltage range is 7-24 V and the supply current is 20 mA. The IC has an internal regulated voltage level of 5 V, and the input voltage levels are TTL-compatible (with pull-up for open-collector drives). The authors include typical performance data a waveforms
Keywords :
bipolar integrated circuits; closed loop systems; digital control; driver circuits; electric drives; machine control; power engineering computing; power integrated circuits; reluctance motors; velocity control; 20 mA; 7 to 24 V; BLOCCS process technology; Hall sensors; LMB1008; PWM generator; closed-loop speed control; comparator; control IC; digital control; error amplifier; excess current detection; frequency-to-voltage converter; internal commutation logic; internal tacho; optical sensors; oscillator; shaft position signals; stepwise-adjustable firing angles; switched reluctance motor drives;
Conference_Titel :
Power Electronics and Variable-Speed Drives, 1991., Fourth International Conference on
Conference_Location :
London
