An electric motor system, which may be included in an aircraft, includes a multi-phase motor, a multi-phase inverter circuit, and a plurality of motor brake switches. The multi-phase inverter circuit is coupled to each phase of the multi-phase stator and is adapted to be coupled to a high-side voltage node and a circuit common node. Each motor brake switch is associated with, and is connected in series between, the circuit common node and a different one of the phases. Each motor brake switch is configured to be in an open state when energized and in a closed state when deenergized. When the motor brake switches are in the open state, the motor brake switches do not connect the associated phases to the circuit common node, and when the motor brake switches are in the closed state, the motor brake switches connect the associated phases to the circuit common node.

An electric motor system, which may be included in an aircraft, includes a multi-phase motor, a multi-phase inverter circuit, and a plurality of motor brake switches. The multi-phase inverter circuit is coupled to each phase of the multi-phase stator and is adapted to be coupled to a high-side voltage node and a circuit common node. Each motor brake switch is associated with, and is connected in series between, the circuit common node and a different one of the phases. Each motor brake switch is configured to be in an open state when energized and in a closed state when deenergized. When the motor brake switches are in the open state, the motor brake switches do not connect the associated phases to the circuit common node, and when the motor brake switches are in the closed state, the motor brake switches connect the associated phases to the circuit common node.

In a non-excitation operative brake, a friction plate faces the inner disk part of an attraction plate made from a magnetic material, and an electromagnet faces the outer disk part of the attraction plate. A part for generating a brake force acting on a hollow shaft is located on an inner circumferential side in a radial direction of the attraction plate, while a part for magnetically attracting the attraction plate so as to release the brake force is located on an outer circumferential side in the radial direction of the attraction plate. A flat non-excitation operative brake having a reduced length in the direction of an axis line can be realized.

In a non-excitation operative brake, a friction plate faces the inner disk part of an attraction plate made from a magnetic material, and an electromagnet faces the outer disk part of the attraction plate. A part for generating a brake force acting on a hollow shaft is located on an inner circumferential side in a radial direction of the attraction plate, while a part for magnetically attracting the attraction plate so as to release the brake force is located on an outer circumferential side in the radial direction of the attraction plate. A flat non-excitation operative brake having a reduced length in the direction of an axis line can be realized.

The invention relates to nuclear technology, and specifically to systems for controlling and protecting nuclear reactors. A drive of an emergency safety rod of a nuclear reactor includes an electric drive, a reduction gear, and a rack-and-pinion gear. The electric drive contains a contactless electric motor based on permanent magnets, which is installed in the housing of the electric drive with a motor rotor position sensor, and a reduction gear for changing the rate of rotation of the electric drive. A toothed rack is installed along the axis of the rack-and-pinion gear in order o provide for the reciprocating motion of a system absorber rod connected thereto. A toothed electromagnetic clutch having a contactless current supply is installed on an inner shaft of the rack-and-pinion gear, enabling the rigid and simultaneous mechanical coupling of half-couplings and the drive contains a reverse-motion coupling, a rack-separation spring and toothed rack position sensors. The invention makes it possible to reduce the time necessary for adding negative reactivity to a nuclear reactor core.

The invention relates to nuclear technology, and specifically to systems for controlling and protecting nuclear reactors. A drive of an emergency safety rod of a nuclear reactor includes an electric drive, a reduction gear, and a rack-and-pinion gear. The electric drive contains a contactless electric motor based on permanent magnets, which is installed in the housing of the electric drive with a motor rotor position sensor, and a reduction gear for changing the rate of rotation of the electric drive. A toothed rack is installed along the axis of the rack-and-pinion gear in order o provide for the reciprocating motion of a system absorber rod connected thereto. A toothed electromagnetic clutch having a contactless current supply is installed on an inner shaft of the rack-and-pinion gear, enabling the rigid and simultaneous mechanical coupling of half-couplings and the drive contains a reverse-motion coupling, a rack-separation spring and toothed rack position sensors. The invention makes it possible to reduce the time necessary for adding negative reactivity to a nuclear reactor core.

A linear actuator with a high holding force providing good irreversibility, has a high efficiency, low friction screw mechanism and a stepper motor with high magnetic detent torque but a low output torque ripple. The phase torque is modified to minimize the effect of the detent torque on the output. torque. Preferably, the motor has asymmetric phases to compensate for the detent torque.

A steam turbine includes a turbine main body having blades supported rotatably, a steam channel which is connected to the turbine main body and in which steam flows, a regulating valve configured to linearly move to adjust opening/closing of the steam channel, and an opening/closing drive mechanism configured to drive the regulating valve. The opening/closing drive mechanism includes an electric motor configured to rotate by an electric power being supplied, a conversion mechanism configured to convert rotational motion of the electric motor into linear motion of the regulating valve, and a brake operated by regenerative energy of the electric motor.

A steam turbine includes a turbine main body having blades supported rotatably, a steam channel which is connected to the turbine main body and in which steam flows, a regulating valve configured to linearly move to adjust opening/closing of the steam channel, and an opening/closing drive mechanism configured to drive the regulating valve. The opening/closing drive mechanism includes an electric motor configured to rotate by an electric power being supplied, a conversion mechanism configured to convert rotational motion of the electric motor into linear motion of the regulating valve, and a brake operated by regenerative energy of the electric motor.

A spatial location precision stabilization system with dual level multi-degree of freedom is provided. The system includes a motion platform; a second-level platform connected to the motion platform and located below the motion platform, the second-level platform is provided with a second electromagnetic driving component to adjust a position of the motion platform; a first-level platform connected to the second-level platform and located below the second-level platform, the first-level platform is provided with a first electromagnetic driving component to adjust the second-level platform, so as to adjust the position of the motion platform; and a controller configured to control the first electromagnetic driving component and the second electromagnetic driving component.