Electric motors can be widely classified into 3 types: AC, DC, and universal. As the name suggests, an AC motor runs with AC power and a DC motor runs with DC power. Universal motors can run with both AC and DC power. Examples of AC motors are AC induction motors and squirrel cage motors. They are further classified as single-phase and multi-phase motors. Examples of DC motors include Brushed DC motors, Brushless DC motors (BLDC), and stepper motors.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.