453 report - ABSTRACT INTRODUCTION DESIGN PROCEDURE...

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ABSTRACT This project discusses the development of an electric motor controller that follows the specifications given in the class website. Mainly these specifications can be grouped under bi-directionality, braking, and speed control. To implement these specifications, the discussed circuit uses a “boost-to-buck” topology that allows a switch from acceleration to braking while using the duty cycles of the converters to control voltage flow while a DPDT switch was added to control the direction of the motor. A GAL chip was programmed to control the multiple transistors used for this circuit. INTRODUCTION The specified electric motor controller is expected to include bi-directionality, speed control, and braking, where each of these aspects have sub-requirements such as the need for default braking to be regenerative and the inclusion of an alternative quick braking scheme. We begin with bi-directionality, which is controlled with a DPDT switch connected in H-bridge formation. This switches the terminals of the motor, thus switching the voltage at the terminals and the direction of rotation. During acceleration and regenerative braking, one terminal of the motor is always switched to the ground terminal and the other terminal is connected to an inductor. The “buck to boost” topology applied allows adjustment of speed control and
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453 report - ABSTRACT INTRODUCTION DESIGN PROCEDURE...

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