An electric hand tool is provided. The electric hand tool receives a shutdown signal issued by a shutdown element under control during an operation process of the electric hand tool, so as to request a driving module to stop providing a driving signal to a plurality of coils provided at the electric motor, and to conduct a brake loop connected to the coils and the driving module. Thus, a short circuit is formed between the coils and the driving module to cause the electric motor to temporarily enter a power generating state to generate a sensing current. The coils receive the sensing current to establish a first magnetic field. The first magnetic field interferes with a second magnetic field produced by a plurality of permanent magnets to form an interfering repulsive force that stops the rotor from rotating, thereby achieving an object of braking promptly.

This actuator comprises: an electric motor; an accommodation part that accommodates the electric motor; a detection part that detects operation of the electric motor; and a fixing part that, at a position further radially outward than the detection part, fixes to a machine housing an end surface of the accommodation pant which is on the opposite side from the output side of the electric motor.

An assembly comprising a rotational driving mechanism of a drive shaft, and an electromagnetic retarder capable of slowing down the rotation of the drive shaft. The driving mechanism has a housing and a drive shaft extending along an axial direction. The electromagnetic retarder has a stator support fixed to the housing that has at least one relief extending along the axial direction, and in that the housing comprises at least one complementary relief cooperating with at least part of the relief of the stator support to fix the position of the stator support in relation to the housing along at least one direction contained in a plane perpendicular to the axial direction.

An assembly comprising a rotational driving mechanism of a drive shaft, and an electromagnetic retarder capable of slowing down the rotation of the drive shaft. The driving mechanism has a housing and a drive shaft extending along an axial direction. The electromagnetic retarder has a stator support fixed to the housing that has at least one relief extending along the axial direction, and in that the housing comprises at least one complementary relief cooperating with at least part of the relief of the stator support to fix the position of the stator support in relation to the housing along at least one direction contained in a plane perpendicular to the axial direction.

The drive unit includes an electric motor which drives a motor shaft. The drive unit also includes a planetary gearbox which has a ring gear and has at least one first gear stage. The first gear stage has at least one planet gear. The drive unit also includes an electromagnetic brake with an excitation coil. The electromagnetic brake is arranged between the electric motor and the planetary gearbox. The excitation coil is accommodated at least in part in a recess in the ring gear.

The drive unit includes an electric motor which drives a motor shaft. The drive unit also includes a planetary gearbox which has a ring gear and has at least one first gear stage. The first gear stage has at least one planet gear. The drive unit also includes an electromagnetic brake with an excitation coil. The electromagnetic brake is arranged between the electric motor and the planetary gearbox. The excitation coil is accommodated at least in part in a recess in the ring gear.

An electromechanical integrated machine (EIM) according to an exemplary aspect of the present disclosure includes, among other things, an internal rotor coupled to a vehicle wheel and an external rotor coupled to a flywheel. An electrified vehicle according to an exemplary aspect of the present disclosure includes, among other things, a first EIM associated with a first wheel, a second EIM associated with a second wheel, a battery having energy to power the first and second wheels, and a flywheel to receive energy from the first and second EIMs during braking. Each EIM includes an internal rotor coupled to the respective first or second wheel and an external rotor coupled to the flywheel.

An electromechanical integrated machine (EIM) according to an exemplary aspect of the present disclosure includes, among other things, an internal rotor coupled to a vehicle wheel and an external rotor coupled to a flywheel. An electrified vehicle according to an exemplary aspect of the present disclosure includes, among other things, a first EIM associated with a first wheel, a second EIM associated with a second wheel, a battery having energy to power the first and second wheels, and a flywheel to receive energy from the first and second EIMs during braking. Each EIM includes an internal rotor coupled to the respective first or second wheel and an external rotor coupled to the flywheel.

A propeller alignment device is described. The propeller alignment device can include a second retainer attached to a propeller and a motor. The propeller alignment device can also include a first retainer that does not rotate, but that is aligned with the second retainer. The first retainer can include two or more magnets oppositely orientated relative to each other. The second retainer can also include two or more magnets oppositely orientated relative to each other. As the second retainer rotates relative to the first retainer, the magnets alternatingly align with each other. In the absence of a current applied to the motor, the magnets may magnetically bias the second retainer into a predetermined orientation relative to the first retainer.

An electric power generation and brake device disposed on a shaft includes: a wheel, a stator unit and a brake unit; the wheel comprising: an outer ring disposed around an edge of the wheel, an inner ring on the wheel and configured between the outer ring and an axis of the wheel, and a plurality of permanent magnets configured on one surface of the outer ring; the stator unit, comprising: a stator body, a plurality of first serrated portions disposed around an outer peripheral surface of the stator body, and a plurality of electric generating coils; the brake unit, comprising: a brake body fixed on the shaft or the stator body and configured between the inner ring and the axis of the wheel, a plurality of second serrated portions, and a plurality of brake coils; with the arrangement to resist vibration and reduce noise.