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By Trevor Mellard

ISBN-10: 0750604360

ISBN-13: 9780750604369

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Care must be taken not to reverse battery polarity otherwise a short circuit is created through the power diodes and the excessive cur­ rent flow could destroy them. The auxiliary field exciter diodes carry a relatively small current hence the exciter diodes are smaller and need dissipate only about 1W. Filtering The output waveform of the three-phase full wave rectifier is fairly smooth in appearance and the average DC value closely approaches the optimum. Further smoothing can be effected by filtering, and capacitive and/or inductive circuits may be used for this purpose.

A potentiometer driven by the motor provides speed and position feedback to form a self-contained positioning system. 4(c). These motors are used where precise position control is necessary along with high-speed operation. shows a small electric linear actuator which com­ prises a low voltage DC motor and short gear train driving a lead screw to provide the linear output, primarily designed for operating flaps in a heater or air conditioning unit. One interesting development is the adaptation of a DC motor to provide linear motion directly, over a long stroke with a constant mechanical force.

If this breakdown voltage were exceeded the diodes would be destroyed by the high breakdown current. Voltage drop across the main diodes in oper­ ation causes a power loss which is dissipated in the form of heat. Power diodes (25 W) are used for this reason and they are mounted on heat sinks to aid cooling. Care must be taken not to reverse battery polarity otherwise a short circuit is created through the power diodes and the excessive cur­ rent flow could destroy them. The auxiliary field exciter diodes carry a relatively small current hence the exciter diodes are smaller and need dissipate only about 1W.

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Automotive Electronic Systems by Trevor Mellard


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