The technical solution relates to devices for pumping fluid media and can be used in industry, transport and the home for pumping liquids and other incompressible and compressible fluid media as well as for extracting oil from wells. The pump assembly with an electric drive consists of a housing, an electric drive armature situated inside the housing, and a displacer situated in the fore end of the housing, wherein the electric drive armature and the displacer are connected to one another. The displacer is in the form of a piston. The electric drive armature consists of the following, connected in series: an electric drive rear spacing block, an electric drive motion block capable of moving relative to the housing in the direction of a change in the length of the motion block, and an electric drive fore spacing block. Unlike the closest prior art, at least one electric drive spacing block is in the form of a magnetostrictive spacing block, and/or the electric drive motion block is in the form of a magnetostrictive motion block. The invention is intended to solve the technical problem of extending the range of existing technical equipment. The positive result of realizing the invention is that of achieving this purpose.

A system for contactless transmission of energy and control signals between a primary device and a secondary device. The primary device has a primary set with at least one primary coil and an electronic supply driver for supplying primary signals to the primary set of primary coils. A secondary device has a secondary set with at least one secondary coil, at least one piezoelectric actuator, and electronic components including a resonant circuit powered by the secondary set. The piezoelectric actuator is powered and controlled through the secondary set of secondary coils and the electronic components.

A gripper mechanism and a movement mechanism which utilize an electromagnetic actuator which can secure a sufficient thrust force at least at a certain level over a wide range of displacement. The movement mechanism includes a pair of electromagnetic actuators disposed inside a pair of rails and an intermediate actuator provided between the electromagnetic actuators. The electromagnetic actuators function as a gripper mechanism to be gripped by the rails. The electromagnetic actuators each include a displacement amplification mechanism including a magnetic body, and coils provided in the displacement amplification mechanism. A magnetic flux is generated in the magnetic body by passing an electric current through the coils so as to displace the displacement amplification points of the displacement amplification mechanism.

Described are three-transducer piezoelectric motors capable of being operated in an ultrasonic mode over a narrow range of driving frequencies and of being operated in an inchworm mode at driving frequencies outside of, and below, the narrow range. The piezoelectric motors are designed such that all three transducers have the same or nearly the same expansion resonant frequency, thus enabling the motors to be operated in an ultrasonic mode when using a driving frequency at or near the expansion resonant frequency, as well as being operable in a normal inchworm mode at other driving frequencies. The inchworm mode allows for precise and controlled positioning and movement, whereas the ultrasonic mode allows for large movements over short periods.