Wireless AC Motor Speed Control System

Abstract

In this paper, we demonstrate the feasibility of controlling the speed of an induction motor using a wireless position feedback over an RF link and compare its performance under dynamic- and steady-state conditions with those obtained by using a wire-based position feedback control. An electronic circuit is coupled to the motor to provide the control-speed signal serially from distant microcontroller. A control panel is designed as an interface for the user to select the appropriate speed. This paper presents a high performance electric assisted bicycle system, where the rotor position is obtained by a position estimation technique using terminal quantities of the motor, which has a capability of starting from standstill. The components of the drive system include a wireless torque feedback, an application specific reference torque generation and torque control. The paper explains the implementation details of the position estimation technique that utilize a motor control DSP and provides real time test results to demonstrate its capabilities under real riding conditions including regenerative braking