STRUCTURE OF WAVE MOTOR

• Main Author: OTAWA SHUJI
• Format: Patent
• Language: English
• Published: 12.09.1988
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION

PURPOSE:To reduce the size, thickness and power of a wave motor by sticking a magnetic detector to part of a toothed section, and detecting a magnetic flux change due to the rotation of a moving element. CONSTITUTION:In a circular wave motor, a cutout 3 is formed on a ring-shaped permanent magnet 1 magnetized elevationally, and bonded to a nonmagnetic round ringlike plate 2. The plate 2 and the magnet 1 are matched to form a moving element. An electrostrictive element 6 made of polarized piezoelectric ceramics is bonded to the lower surface of a vibrator 4, an electric signal is applied to the pole to form a traveling wave. The vibrator 4 is formed at the contacting part with the moving element in a pectinated state to increase the width. A Hall element 5 is formed in the recess of the pectinated teeth. Thus, the position detection of the element with the magnet can be performed in a simple structure with low power consumption, thereby reducing the thickness, the size and the power consumption.