The disclosure describes an automated aerial vehicle (AAV) and system for automatically detecting a contact or an imminent contact between a propeller of the AAV and an object (e.g., human, pet, or other animal). When a contact or an imminent contact is detected, a safety profile may be executed to reduce or avoid any potential harm to the object and/or the AAV. For example, if a contact with a propeller of the AAV by an object is detected, the rotation of the propeller may be stopped to avoid harming the object. Likewise, an object detection component may be used to detect an object that is nearing a propeller, stop the rotation of the propeller, and/or navigate the AAV away from the detected object.

A solar tracker having a brake function is disclosed. The solar tracker according to an embodiment of the present invention relates to a technology having a dual position sensing device provided at a part at which altitude adjustment and horizontal rotation of a solar collector plate respectively end, such that a brake is accurately operated for a driving motor, which is respectively in charge of altitude adjustment and horizontal rotation.

A solar tracker having a brake function is disclosed. The solar tracker according to an embodiment of the present invention relates to a technology having a dual position sensing device provided at a part at which altitude adjustment and horizontal rotation of a solar collector plate respectively end, such that a brake is accurately operated for a driving motor, which is respectively in charge of altitude adjustment and horizontal rotation.

Control method for braking an electric motor (7) of an electric handheld power tool (1), the electric motor (7) including a stator winding (12) and a rotor winding (14), wherein the method includes a) switching (S1) the electric motor (7) from motor operation to braking operation, b) reversing the polarity (S2) of an input voltage applied to the rotor winding (14) compared to motor operation, c) limiting (S3) a rotor current (I.sub.R(t)) of the rotor winding (14) as a function of a predetermined threshold value (I.sub.L), and d) regulating (S4) a stator current (I.sub.S(t)) of the stator winding (12) as a function of a current rotation speed (n(t)) of the electric motor (7).

Control method for braking an electric motor (7) of an electric handheld power tool (1), the electric motor (7) including a stator winding (12) and a rotor winding (14), wherein the method includes a) switching (S1) the electric motor (7) from motor operation to braking operation, b) reversing the polarity (S2) of an input voltage applied to the rotor winding (14) compared to motor operation, c) limiting (S3) a rotor current (I.sub.R(t)) of the rotor winding (14) as a function of a predetermined threshold value (I.sub.L), and d) regulating (S4) a stator current (I.sub.S(t)) of the stator winding (12) as a function of a current rotation speed (n(t)) of the electric motor (7).

An electric drive unit for an electric handheld power tool, having an electric motor with a stator winding and a rotor winding, an actuating circuit for actuating the electric motor and a connection unit for coupling an energy source for driving the electric motor, wherein the stator winding is connected via a first node to a stator-side first half-bridge including a first semiconductor component and a second semiconductor component and is connected via a second node to the rotor winding, wherein the rotor winding is connected to a third node which is connected via a conductive component to the connection unit, and wherein the actuating circuit includes a third semiconductor component which is connected via the second node to the rotor winding and the stator winding and which is connected via a fourth node directly to the connection unit.

An electric drive unit for an electric handheld power tool, having an electric motor with a stator winding and a rotor winding, an actuating circuit for actuating the electric motor and a connection unit for coupling an energy source for driving the electric motor, wherein the stator winding is connected via a first node to a stator-side first half-bridge including a first semiconductor component and a second semiconductor component and is connected via a second node to the rotor winding, wherein the rotor winding is connected to a third node which is connected via a conductive component to the connection unit, and wherein the actuating circuit includes a third semiconductor component which is connected via the second node to the rotor winding and the stator winding and which is connected via a fourth node directly to the connection unit.

A motor controller comprises a switch circuit, a control circuit, and a function pin. The switch circuit is coupled to a motor for driving the motor. The control circuit generates a plurality of control signals to control the switch circuit. The function pin is coupled to the control circuit for receiving a function signal. The function signal is configured to inform the motor controller to execute a braking function. The braking function enables a braking time to be a variable value.

A motor controller comprises a switch circuit, a control circuit, and a function pin. The switch circuit is coupled to a motor for driving the motor. The control circuit generates a plurality of control signals to control the switch circuit. The function pin is coupled to the control circuit for receiving a function signal. The function signal is configured to inform the motor controller to execute a braking function. The braking function enables a braking time to be a variable value.

A pulse hub motor having coils (101) and magnets (107) interacting three dimensionally in x, y, and z axes to facilitate both increased power and efficiency through the ability to have more coils (101) in the motor, have each coil (101) perform both push and pull functions, and yet have the flexibility to only use the amount of coils (101) needed for real-time power requirements, whilst regenerating power in both normal drive and braking modes.