Johnson Electric S.a.

Techtronic Cordless Gp

Hong Kong Applied Science and Technology Research Institute Company, Limited

Johnson Electric International Ag

Chun Kit Cheung

Duncan Yiu Lung Wong

James Ching Sik Lau

Brianna E Williams

Lawrence Fung Pok Lo

Xiao Ying Yang

Kar Wai Lam

Wilfried Gorlt

James Ching-Sik Lau

Cai Yong Zhang

Chun Yick Chung

Jian Wei Sun

Wan Hua Xie

Nibedita Parida

Daniel Alex Chunn

A headlamp assembly comprising an adjustable strap, a mount receiver, a light, and a mount attachment. The mount receiver is coupled to the adjustable strap. The light includes a body, a head pivotably coupled relative to the body by a hinge, and a light emitting element supported on the head. The mount attachment includes a first attachment structure configured to selectively engage the light and a second attachment structure configured to selectively engage the mount receiver. The first attachment structure and second attachment structure are operable independent of one another such that the light is capable of being removed from the mount receiver either by removing the light from the mount attachment or by removing the light and the mount attachment from the mount receiver.

Multi-mount system for light

A DC microgrid has increased DC bus voltage inertia without adding large physical capacitors. A Virtual Inertia Enhancement Controller (VIEC) of a DC-DC converter emulates a DC machine's mechanical inertia characteristics through a virtual capacitor which compensates for a power imbalance causing DC bus voltage fluctuations. When a battery charges and generated photovoltaic (PV) power is more than the load power, VIEC controls the PV's DC-DC converter to the DC bus. When the battery discharges and generated PV power is less than load power, VIEC controls the battery's DC-DC converter to the DC bus. VIEC controls both the PV's DC-DC converter and battery's DC-DC converter to the DC bus when generated PV power is more than the load power and battery is fully charged. VIEC emulates an additional virtual capacitance in parallel with DC link capacitors. DC bus voltage fluctuations are significantly reduced by the VIEC emulating virtual capacitors.

Distributed inertia-enhancement control method of the DC-bus voltage of a low-inertia DC microgrid

A mount system comprising a mount receiver, a light, and a mount attachment. The light includes a body, a head pivotably coupled relative to the body by a hinge, and a light emitting element mounted on the head. The mount attachment is configured to engage both the mount receiver and the light to secure the light to the mount receiver.

A motor driving assembly includes a motor. The motor includes an outer housing, and a rotor and a brush holder received in the outer housing. The rotor includes a rotary shaft extending out of the outer housing. A commutator is fixed on a shaft portion of the rotary shaft within the outer housing. Brushes for contacting the commutator are disposed on the brush holder. A visible identification mark fixed relative to the rotary shaft is disposed outside the outer housing of the motor, such that a relative position between the brushes and the commutator in a rotational direction of the rotary shaft is identifiable by reference to a position of the visible identification mark relative to the outer housing in the rotational direction of the rotary shaft. As such, the commutator can be prevented from stalling at a position where arcing noise may be easily generated.

Motor driving assembly

A rotor for an electric motor has an iron core and a winding wound about teeth of the rotor core. Slots are formed between the teeth to accommodate coils of the winding. The winding includes several layers of windings distributed in the radial direction of the rotor. Each winding layer has a plurality of coils with the coils of each winding layer being wound on the teeth in the circumferential direction of the rotor. The overall center of gravity of the winding layers is substantially positioned at the geometric center of the rotor. Thus the center of gravity of the entire winding is located substantially at the geometric center of the rotor, thereby preventing noise caused by unstable rotation due to the deviation between the center of gravity of the winding and the geometric center of the rotor.

Electric motor

A commutator includes a first body and a second body which are separately made of electrically insulating material, a plurality of commutator segments fixed on an outer surface of the first body and a plurality of commutator terminals. The first body is a hollow cylinder with two opposite ends. Each terminal has a contact area for contacting a corresponding one of the commutator segments. The second body has a base and a ring wall extending from the base, and one end of the first body is received in a space defined by the base and the ring wall, with the contact area of each terminal being in tight contact with the corresponding commutator segment at the inner side of the ring wall.

Commutator

A motor for a fuel pump includes a rotor which includes a shaft, a rotor core and a commutator fitted on the shaft. The rotor core is formed by stacking together a plurality of aligned laminations and includes a plurality of salient poles arranged along a circumference thereof. A center line of gravity of the rotor deviates from a rotational axis of the rotor. The rotor core has a first groove in one of the poles close to the center line of gravity of the rotor. The first groove extends from a first axial end of the rotor core to an axial middle portion of the rotor core.

Fuel pump motor

An electric motor has a stator and a rotor rotatably installed in the stator. The stator includes a housing, a plurality of magnets installed at an inner surface of the housing, a brush card installed inside of the housing, brushes mounted on the brush card, lead wires for connecting to a power source and feeding power to the brushes, and an end cap attached to an end of the housing and covering the brushes. The rotor includes a shaft, a commutator fixed on the shaft, a rotor core fixed on the shaft and a winding wound on the rotor core and connected to the commutator. An EMI suppression component is mounted on the brush card and covered by the end cap, and the lead wires extends through the EMI suppression component.

Permanent magnet motor

An electric motor includes a stator and a rotor rotatably installed in the stator. The stator has a housing and a plurality of permanent magnets. The outer diameter of the housing is less than 40 mm and the ratio of the maximum thickness of the magnets in the radial direction of the rotor to the diameter of the rotor is in the range of 1:7 to 1:50.

Growing community of inventors

Hong Kong, China

Chun Kit Cheung