An unbalance exciter is specified with at least two unbalance shafts arranged parallel to one another. Each of the unbalance shafts comprises its own, separately controllable drive for generating a drive torque. A coupling device is provided for coupling the two unbalance shafts so that they can counter-rotate. The coupling device comprises a backlash device for enabling a specific backlash in the rotational positions of the two unbalance shafts relative to one another. Backlash between the two unbalance shafts with a predetermined angle of rotation can be enabled by the backlash device, wherein the angle of rotation is selected from a range between 45 and 315.

The disclosure relates to integrated modules for Synchronized Array of Vibration Actuators (FIG. 125A). The modules provide physical interface, power and communication interfaces. Each module may include vibration actuators (FIG. 123A) which can be precisely attached and aligned to the module housing, a microcontroller or other microprocessor, and one or more sensors for closed loop control of actuators (FIG. 126G). Interleaved pairs of ERMs having a center of mass in the same plane eliminate parasitic torque. A single module can produce a vibration force that rotates at a specific frequency and magnitude, which on its own could cancel out some types of periodic vibrations (FIG. 125B). Two modules paired together and counter-rotating with respect to each other can produce a directional vibration at a specific frequency and magnitude, which could prove even more useful for canceling out a vibration. Such modules are also employed to produce beating patterns (FIGS. 131-133). Both amplitude and frequency of the beating force are variable.

The disclosure relates to integrated modules for Synchronized Array of Vibration Actuators (FIG. 125A). The modules provide physical interface, power and communication interfaces. Each module may include vibration actuators (FIG. 123A) which can be precisely attached and aligned to the module housing, a microcontroller or other microprocessor, and one or more sensors for closed loop control of actuators (FIG. 126G). Interleaved pairs of ERMs having a center of mass in the same plane eliminate parasitic torque. A single module can produce a vibration force that rotates at a specific frequency and magnitude, which on its own could cancel out some types of periodic vibrations (FIG. 125B). Two modules paired together and counter-rotating with respect to each other can produce a directional vibration at a specific frequency and magnitude, which could prove even more useful for canceling out a vibration. Such modules are also employed to produce beating patterns (FIGS. 131-133). Both amplitude and frequency of the beating force are variable.

The technology provides for generating pure torque vibrations using a synchronized pair of rotating masses arranged in parallel. Each mass is statically balanced but dynamically imbalanced, producing a torque vibration substantially without generating a net translational force when rotated at a constant angular velocity. By rigidly coupling motors and adjusting the relative phase angle between their shafts, the combined torque output can be varied continuously from approximately zero amplitude to a maximum amplitude. The approach supports co-rotating and counter-rotating modes at the same or differing angular velocities, enabling effects such as torque beating (arising from slightly different co-rotating speeds) and torque spinning (arising from counter-rotating shafts at differing angular velocities). These operational modes effectively decouple vibration amplitude from frequency, offering versatile control over torque-based vibration characteristics. The disclosed technology is applicable to products including handheld or wearable haptic devices, game controllers, personal grooming devices, industrial vibrators, and automotive applications.

Aspects of the technology employ components to control and combine the vibration outputs of two vibration motors into essentially a pure vibration force, which can be controlled to output a given frequency and amplitude, produce beat frequencies, and produce brief impulses. For instance, identical attachment elements are affixed to a vibration device but do not contact each other during operation. Such attachment elements are able to cancel undesired torque vibrations to provide a combined pure force vibration output. The attachment elements may be secondary eccentric rotating masses affixed to the shaft of a vibration motor. Along with the vibration motor's primary eccentric rotating mass, these elements can cancel out unwanted parasitic torque vibrations by producing counter-torque vibrations.

The invention provides a novel vibration generation tool that utilizes a complex modulated high frequency actuator to create modulated low frequency hammer vibrations or compounded complex modulated high frequency and corresponding complex modulated low frequency hammer vibrations applied to a structure. Novel application of complex modulated actuator driving signals are used to stimulate wideband frequency response vibrations from a structure under treatment to facilitate improved cleaning, stress relief, screen de-blinding, and process improvement for a wide range of applications where wideband frequency vibrations may be helpful. It is especially helpful in applications where scale or fouling tends to accumulate and requires periodic or full-time remediation. The modulated high frequency/low frequency vibration tool may be used as a handheld portable tool, mounted to a robotic system, or fixed to a structure for long-term or periodic operation.

Motor-vibrator assembly for a vibrating machine having a plurality of motor-vibrators, each having a synchronous motor and at least one eccentric mass divided into two bodies fixed to two respective free ends of the shaft of the motor. The motor-vibrator assembly comprises position sensing means to sense the angular position and the angular velocity of the shafts of the synchronous motors, electronic drive devices to operate the synchronous motors and an electronic control unit, which is configured to control the electronic drive devices based on the angular positions and on the angular velocities sensed, so that the motor-vibrator assembly generates a predetermined vibratory motion.