Tape drive with high performance gain amplifier using radio freq

Details Tape drive with high performance gain amplifier using radio freq Tape drive with high performance gain amplifier using radio freq

1995-10-23

1999-04-06

Martin, David S.

Electricity: motive power systems

Positional servo systems

Multiple mode systems

318254, 318677, 388811, 388910, 360 7303, 360 741, G05B 1118

Patent

active

058923470

ABSTRACT:
A power amplifier (18) for driving a brushless DC motor (22) includes a processor (40) which receives a signal indicative of motor situational usage and generates a mode state signal indicative of which one of a plurality of amplification modes is to be implemented in response to the received signal. The amplification modes include a linear mode and a switching mode, with the switching mode including a two quadrant switching mode and a four quadrant switching mode. The amplifier (18) further includes a controller (50) which, in response to the mode state signal, generates control signals for each of coil drive circuits (26) associated with the motor. Further, in response to a signal indicative of motor situational usage, processor (40) generates a power state signal which causes controller (50) to connect coil drive circuits (26) to a suitable one of a plurality of differing voltage sources (21, 23). The power amplifier (18) has particular employment for a reel motor (22S, 22T) for a helical scan recorder (100) which records information on magnetic tape (102).

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