Development of a piezoelectric cycloid motor

Construction Principle and Torque Solution of the Translational Meshing Motor

“…1(c), respectively. A and B are hinge points on the stator, a and b are hinge points on the rotor, and 1 O halves the line AB, while 2 O halves the line ab. Under the electromagnetic force acting on, the rotor is constrained to move by translation by the parallelogram linkage ABba, at the same time the ring gear moves by translation driven by rotor.…”

“…Their features are high reduction ratio, little friction between driving and driven gears, which result in that these types of actuators have higher efficiency and life than ultrasonic motors and harmonic motors. Because of these advantages of gear drives, many types of motors combined with gear mesh mode and driving means, such as piezoelectric cycloid motor [1], pneumatic wobble motors [2], pneumatic direct-drive stepping motor [3], etc., were developed. In 2001 year, a new design of motor based on gear mesh principle, named gear mesh motor [4] was advanced.…”

“…Under the electromagnetic force acting on, the rotor is constrained to move by translation by the parallelogram linkage ABba, at the same time the ring gear moves by translation driven by rotor. According to the cycloid meshing law, the distance between 1 O and 2 O must be equal to the difference of the base radius of cycloid ring gear b R and the base radius of cycloid external gear b r , which can be expressed as…”

“…Fig.1 shows the construction principle of the translational meshing motor. In the 2-D project plane, 1 O is defined as the point of the center of rotation of the cycloid external gear as well as the stator center; 2 O is defined as the point of the center of the cycloid ring gear and the point of the rotor center. Fig.…”

Ultraminiature Piezomechanisms

“…Hayashi (1992) developed his direct drive cycloid motor which resembles the construction of a harmonic gear assembly [68]. The construction of this motor is shown in Fig.…”