A holder is used while attached to a chassis of a vibration generator that moves a vibrator to generate a vibration. The holder includes a vibrator retention unit retaining the vibrator, a fixed unit fixed to the chassis, and an arm. The arm connects the fixed unit and the vibrator retention unit, and the arm supports the vibrator retention unit while the vibrator retention unit can be displaced with respect to the fixed unit. The fixed unit, the arm, and the vibrator retention unit are integrally formed using resin.

A holder is used while attached to a chassis of a vibration generator that moves a vibrator to generate a vibration. The holder includes a vibrator retention unit retaining the vibrator, a fixed unit fixed to the chassis, and an arm. The arm connects the fixed unit and the vibrator retention unit, and the arm supports the vibrator retention unit while the vibrator retention unit can be displaced with respect to the fixed unit. The fixed unit, the arm, and the vibrator retention unit are integrally formed using resin.

Disclosed herein are permanent magnetic AC machine direct-drive resonant flapper system for flapping wing micro air vehicles and flapping fin autonomous underwater vehicles.

Disclosed herein are permanent magnetic AC machine direct-drive resonant flapper system for flapping wing micro air vehicles and flapping fin autonomous underwater vehicles.

A vibration device, including a shell, a vibrator and a stator accommodated in the shell, and an elastic member. One of the vibrator and the stator includes a magnetic circuit unit while the other one includes a coil. The elastic member includes a first fixing portion fixedly connected with the shell, a first elastic arm and a second elastic arm bending and extending from two opposite ends of the first fixing portion, a second fixing portion extending from an end of the first elastic arm in a direction away from a geometric center of the first fixing portion, and a third fixing portion extending from an end of the second elastic arm in a direction away from the geometric center of the first fixing portion; both the second fixing portion and the third fixing portion are fixedly connected with the vibrator.

A vibration device, including a shell, a vibrator and a stator accommodated in the shell, and an elastic member. One of the vibrator and the stator includes a magnetic circuit unit while the other one includes a coil. The elastic member includes a first fixing portion fixedly connected with the shell, a first elastic arm and a second elastic arm bending and extending from two opposite ends of the first fixing portion, a second fixing portion extending from an end of the first elastic arm in a direction away from a geometric center of the first fixing portion, and a third fixing portion extending from an end of the second elastic arm in a direction away from the geometric center of the first fixing portion; both the second fixing portion and the third fixing portion are fixedly connected with the vibrator.

A holder is used while attached to a chassis of a vibration generator that moves a vibrator to generate a vibration. The holder includes a vibrator retention unit retaining the vibrator, a fixed unit fixed to the chassis, and an arm. The arm connects the fixed unit and the vibrator retention unit, and the arm supports the vibrator retention unit while the vibrator retention unit can be displaced with respect to the fixed unit. The fixed unit, the arm, and the vibrator retention unit are integrally formed using resin.

Provided is a cleaning device for personal cleaning and care, comprising a cleaning device housing detachably connected to a handle housing, a bracket for supporting the cleaning device, a cleaning element carrier and cleaning elements distributed on the cleaning element carrier, a passive assembly, and a cleaning device transducer. The cleaning device transducer comprises at least two transducer elastic elements; one end of each transducer elastic element is fixedly connected to a corresponding transducer elastic element retainer, and the other end of each transducer elastic element is fixedly connected to an transmission arm of the transducer bracket coupling elastic element; wherein a cleaning device having a natural vibration frequency f.sub.natural is constituted utilizing the bending strain of an elastic material, such that the natural frequency f.sub.natural of the cleaning device is in the range of 100 Hz to 400 Hz, and the relationship between the natural frequency f.sub.natural and the frequency f.sub.0 of the electromagnetic force produced by the drive coil in the handle satisfies: 0.85f.sub.0<f.sub.natural<1.05f.sub.0. The present cleaning device has a compact structure and an aesthetically pleasing shape, rotates steadily, and produces little noise.

Provided is a cleaning device for personal cleaning and care, comprising a cleaning device housing detachably connected to a handle housing, a bracket for supporting the cleaning device, a cleaning element carrier and cleaning elements distributed on the cleaning element carrier, a passive assembly, and a cleaning device transducer. The cleaning device transducer comprises at least two transducer elastic elements; one end of each transducer elastic element is fixedly connected to a corresponding transducer elastic element retainer, and the other end of each transducer elastic element is fixedly connected to an transmission arm of the transducer bracket coupling elastic element; wherein a cleaning device having a natural vibration frequency f.sub.natural is constituted utilizing the bending strain of an elastic material, such that the natural frequency f.sub.natural of the cleaning device is in the range of 100 Hz to 400 Hz, and the relationship between the natural frequency f.sub.natural and the frequency f.sub.0 of the electromagnetic force produced by the drive coil in the handle satisfies: 0.85f.sub.0<f.sub.natural<1.05f.sub.0. The present cleaning device has a compact structure and an aesthetically pleasing shape, rotates steadily, and produces little noise.

Most vibration generators that use rotating eccentric masses of prior arts have disadvantages in controlling vibration magnitude such as stopping equipment, adjusting intermittently, or limitation on control range. In the present invention to continuously change the direction of a generated vibration force or its magnitude, the principle of synthesizing simple harmonic motions by phase shifting is used and two methods, called a mechanical phase shifting and a motor speed controlled phase shifting, are provided. A mechanical phase shifting device includes an angle adjusting plate to change the phases of two eccentric mass rotators and two pairs of gears and links for a reverse rotation of eccentric masses. A motor speed controlled phase shifting is enabled by acceleration and deceleration of a motor. A moment generator comprises two sets of eccentric mass vibrators connected by extending shafts between them and can be used for industry shakers, stabilizer's for floating bodies, and so on.