PROGRESS: Completed Project	PROJECT REF: PA060
PROJECT TITLE: Rotary Motor Driven by a Piezoelectric Composite Laminate
PROJECT DESCRIPTION: The invention relates to a novel rotary motor driven by piezoelectric composite laminate material. Mechanical vibrations are created by piezoelectric elements that are caused to alternately expand and contract by the application of an alternating electric field. The magnitude of these vibrations is usually small, but large gain can be obtained by applying resonance principles. The directions of the vibrations are normally mechanically rectified so as to obtain the required motor output. The novel motor has a number of advantages over conventional electromagnetic (EM) motors. The new motors are capable of operating at high speed and high efficiency, and can produce a very high output torque. Another important advantage of piezoelectric motors is that unlike EM motors, they are not sensitive to any ambient EM fields, thus they may be used in applications where conventional motors cannot be used without difficulty. Potential Applications: - Toys, household electrical appliances - Precision control systems Advantages over Present Technologies: 1. The structure of this motor is very simple. 2. The production cost is low. 3. The motor does not generate magnetic field. 4. The motor has good low-speed performance. 5. The motor is suitable for run-and-stop (alternating) applications.
FOCUS AREA(S): Advanced Manufacturing Technologies, Consumer Electronics
KEYWORDS: toy, household electrical appliance, precision control system, rotary motor, peizoelectric composite
MODE OF COLLABORATION: Technology Licensing, Further R&D Collaboration
STATUS PATENT: Granted	PATENT NO: US5942838
ORGANIZATION: Hong Kong University of Science and Technology R and D Corporation Limited
CONTACT PERSON: Shirley Woo	EMAIL: cawoosw@ust.hk
TEL: (852)-23587918	FAX: (852)-23582751
WEBSITE: http://rdc.ust.hk/	DATE: 29/12/2004