Abstract: A fan and a motor thereof are provided. The motor includes a motor drive device. The motor drive device includes a printed circuit board. A control management unit and a voltage converter are arranged on the printed circuit board, the control management unit classifies target rotation speed signals provided by an ECU into multiple rotation speed intervals, with each rotation speed interval corresponding to a fixed duty ratio. The control management unit receives a target rotation speed signal transmitted from the ECU in a real-time manner, and outputs a pulse width modulation signal having a duty ratio corresponding to the rotation speed interval to which the target rotation speed signal transmitted from the ECU belongs.

Abstract: An electric motor includes a stator having multiple magnetic poles and a rotor rotatably mounted to the stator. The rotor includes a shaft, a commutator and a rotor core fixed to the shaft; and windings wound on the rotor core and electrically connected to the commutator. The rotor core is formed by stacking a plurality of laminations. Each lamination includes an inner ring having a hole for fixing the shaft; an outer ring radially spaced from the inner ring; multiple teeth extending outwardly from the outer ring, and multiple ribs connecting the inner ring to the outer ring. Each rib has a width w measured in a circumferential direction of the lamination. The number of ribs is n. The width w and the number n satisfy the formula: 0.75?n×w2?64, where the width w is measured in millimeters.

Abstract: Embodiments relate generally to systems and methods for providing a secure attachment between a gas detector and an external device. A gas detector may comprise a socket comprising a cable attachment configured to interface with an external device; and a holder configured to attach to the socket and to the external device, the holder comprising a first interface configured to attach to the socket of the gas detector; a second interface configured to attach to the external device; a first cable attachment located within the first interface, configured to attach to the gas detector; and a second cable attachment located within the second interface, configured to attach to the external device.

Abstract: An electric motor has a polygon stator core. The polygon stator core includes yoke portions and teeth extending inwardly from the yoke portions. A winding slot is formed between adjacent teeth. Adjacent yoke portions are interconnected by a connecting portion. The winding slots include first winding slots and second winding slots of different shapes. The ratio of the area of a first winding slot to the area of a second winding slot is greater than or equal to 0.9 but less than or equal to 1.1. By changing the shape of the stator core, the size of the winding slots may be increased without increasing the radial dimension of the motor.

Abstract: A technique for processing a lock request is provided. A first lock server is a takeover lock server of a second lock server. The first lock server enters a silent state after learning that a fault occurs in the second lock server, where a silent range is a resource for which the second lock server has assigned permission. The first lock server receives an acquire lock request that is originally sent to the second lock server, and the first lock server assigns lock permission for a corresponding resource according to the acquire lock request if the second lock server has not assigned resource for the resource. By means of this solution, an impact range of a fault occurring in a lock server can be reduced, and stability of a lock management system is improved.

Abstract: A brush assembly for a brush motor includes a support member, brush holders, at least four brushes respectively mounted to the brush holders, and first and second motor terminals for connecting with an external power supply. A first filter circuit is connected between the first motor terminal and corresponding first brushes. A second filter circuit is connected between the second motor terminal and corresponding second brushes. The first and second motor terminals and the first and second filter circuits are mounted in a region defined by two corresponding adjacent brushes forming an angle greater than 60 degrees but less than 180 degrees.

Abstract: An actuator includes a motor driving a worm, a gearbox, and a motor control module. The gearbox includes a gearbox housing, a worm wheel mounted in the gearbox and meshed with the worm, and an output mechanism coaxially fixed to the worm wheel. The motor control module includes a control module housing, a printed circuit board received in the control module housing, and a connector connected to the printed circuit board and mounted at an open end of the control module housing, the control module housing connected with the gearbox housing. The control module housing comprises at least one plane surface with at least one resilient vibration absorber mounted thereon.

Abstract: A BLDC motor, has a first sub-motor and a second sub-motor. The first and second sub-motors have independent input terminals and a common rotor, including a common output shaft. In a normal operating mode the two sub-motors operate together as one motor to output a normal operating power of the motor. In an emergency operating mode, when one sub-motor has become faulty and generates a braking torque, the normal sub-motor is operated to generate a torque to compensate for the braking torque produced by the faulty sub-motor.

Abstract: An actuator for an electric parking brake system includes a motor, an output member, and a speed reduction device. The speed reduction device includes a transmission mechanism and a self-locking mechanism. The self-locking mechanism includes a fixed member, first and second rotating bodies, and a spring. The second rotating body transmits torque to the output member via a planetary gear mechanism. The spring prevents the brake from driving the motor.

Abstract: The present disclosure discloses an arbitration processing solution when brain split occurs in cluster. The solution includes: receiving, by the quorum storage apparatus, first master quorum node preemption requests within a first master quorum node preemption detection period sent by the at least two quorum nodes when brain split occurs in the cluster; sending, by the quorum storage apparatus, a first master quorum node preemption success response message to the initial master quorum node when the first master quorum node preemption request sent by the initial master quorum node is received; where the first master quorum node preemption success response message indicates the initial master quorum node succeeds in master quorum node preemption.

Abstract: A brush assembly for a brush motor includes a support member, brush holders, at least four brushes respectively mounted to the brush holders, and first and second motor terminals for connecting with an external power supply. A first filter circuit is connected between the first motor terminal and corresponding first brushes. A second filter circuit is connected between the second motor terminal and corresponding second brushes. The first and second motor terminals and the first and second filter circuits are mounted in a region defined by two corresponding adjacent brushes forming an angle greater than 60 degrees but less than 180 degrees.

Abstract: An actuator of an electric parking brake system includes a motor, an output member, and a transmission device. The transmission device includes a housing, a self-locking unit and a transmission unit. The self-locking unit includes a fixed sleeve, and a driving member, a driven member and a lock holder that are rotatable with respect to the sleeve. The lock holder supports lock elements arranged to prevent the driven member from turning unless it is driven by the driving member. A planetary gear unit may be provided as part of the transmission device.

Abstract: An electric coolant pump includes a housing, a motor received in the housing, an impeller for driving coolant, and a control unit for controlling the motor. The control unit and the impeller are arranged at opposite ends of the motor. The motor includes a sleeve, a stator mounted around the sleeve, and a rotor rotatably received in the sleeve. The impeller is fixed to the rotor. A radial gap is formed between the sleeve and the rotor. The sleeve includes a plurality of ribs extending from an internal surface of the sleeve into the gap. At least a portion of the ribs of the sleeve guide the coolant towards the control unit to absorb heat generated by the control unit.

Abstract: An electric power steering assembly includes a motor which includes a brush assembly. The brush assembly includes a brush base, a plurality of brush units and a plurality of fixing units for fixing the brush units to the brush base. The brush unit includes a brush, a guide rail and a spring. The rail includes two guiding arms, a closed end interconnecting the guiding arms and wings extending from free ends of the guiding arms. Grooves in the brush receive the guiding arms. The fixing unit includes a first fixture and a second fixture. The closed end of the guide rail engages the first fixture. The second fixture includes two columns spaced from each other. Each column defines a slot in a top end. Protrusions extend from a side of each slot to lock the wings in the slots.

Abstract: A method for processing a fault of a lock server in a distributed system is disclosed, where the distributed system includes m lock servers, which locally store same lock server takeover relationship information. Lock servers in the distributed system that are not faulty receive a notification message, which carries information about a fault of a first lock server; after receiving the notification message, a second lock server determines that it is a takeover lock server of the first lock server according to the lock server takeover relationship information, and the takeover lock server enters a silent state; after receiving the notification message, a third lock server in the distributed system determines that it is not the takeover lock server of the first lock server according to the lock server takeover relationship information. After receiving a locking request, the third lock server allocates lock permission information according to the locking request.

Abstract: Sensitive data is protected in a software product. A source file of the software product is compiled to generate an object file, in which the source file includes at least one piece of sensitive data marked with a specific identifier. The object file has a secure data section for saving storage information of the at least one piece of sensitive data at compile-time and run-time. The object file is linked to generate an executable file. The executable file updates the secure data section at run-time. Sensitive data is also protected when a core dump is generated.

Abstract: A rotor includes a rotor core and a plurality of magnets. The magnets are fixed on an outer circumferential surface of the rotor core. The rotor further includes at least one protective tube. The protective tube includes a cover portion. An inner circumference of the cover portion is greater than a length of an envelope line formed by outer circumferential surfaces of the magnets and common tangents of the outer circumferential surfaces of adjacent magnets, and is less than a circumference of a circumscribed circle of the magnets. The cover portion covers the magnets in a circumferential direction, thereby guaranteeing the fixing strength of the magnets while also preventing the magnets from breaking.

Abstract: A brush motor includes a stator and a rotor. The rotor includes a rotary shaft with a rotor core and commutator fixed thereto. The commutator includes an insulating base and commutator segments fixed to the insulating base. The stator includes 2P stator poles, where P is an integer greater than 1. The rotor comprises m teeth, where 4P>m>2P, and 2m is an integral multiple of P. The rotor includes a rotor winding, which is a concentrated winding having m first elements and m second elements. Each tooth is wound with one of the first elements and one of the second elements. the m first elements form a plurality of element groups, each having n first elements connected in series, and being connected only to corresponding commutator segments at both ends thereof, where P?n?2. Both ends of each second element are connected to corresponding commutator segments.

Abstract: An actuator includes a motor driving a worm, a gearbox, and a motor control module. The gearbox includes a gearbox housing, a worm wheel for meshing with the worm, an output mechanism fixed to the worm wheel. The gearbox housing defines worm chamber and worm wheel chamber. The motor control module includes a control module housing, a printed circuit board and a connector of the printed circuit board. The control module housing defines a control module chamber and the connector is mounted at an open end of the control module chamber. The control module housing is connected with the gearbox housing. The control module chamber and the worm wheel chamber are located on opposite sides of the worm chamber. An isolation slot is defined between the control module chamber and the worm chamber.

Abstract: A BLDC includes an outer casing, and a first sub-motor and a second sub-motor mounted within the outer casing. The BLDC further includes a terminal hub, and a first conductive terminal set and a second conductive terminal set. The first and second sub-motor include their respective stators that are energized independently and a common rotor. The first conductive terminal set is configured as a power supply branch circuit for the stator of the first sub-motor, the second conductive terminal set is configured as a power supply branch circuit for the stator of the second sub-motor. The first and second sub-motors can be configured to selectively commonly operate as a single motor to output normal power or operate independently. When one sub-motor fails, the other sub-motor can independently operate to ensure reliability and safety of the motor.