A motor includes a shaft. The motor includes a motor section and a motor-driving section that is positioned on one side of the motor section in the axial direction and that drives the motor section. The motor section includes a rotor that is rotatable around the shaft, a stator that is disposed outside of the rotor in a radial direction, and a housing that contains the rotor and the stator. The motor-driving section includes a circuit board and a plurality of heat-generating elements mounted on the circuit board. The motor includes an inverter circuit that controls driving of the motor section and an inverter case that contains the inverter circuit. The inverter circuit includes a plurality of blocks including a power source block, a drive block, and a control block, and at least one of the plurality of blocks is separated from the other blocks.

A rotary compressor (100) includes a casing (1), an electric motor (2) and a compression mechanism (3), in which the electric motor (2) includes a stator core (21) and a rotor core (22), the compression mechanism (3) includes an air cylinder assembly (31) and a main bearing (32) connected to a side end face of the cylinder assembly (31) adjacent to the electric motor (2), the largest distance between a side end face of the stator core (21) adjacent to the first end wall (111) and the first end wall (111) is denoted by Dst, the smallest distance between a side end face of the rotor core (22) adjacent to the first end wall (111) and a side end face of a flange portion (321) of the main bearing (32) at one side adjacent to the first end wall (111) is denoted by Drt, in which Dst and Drt satisfy a relationship: 0.335?Dst/Drt?0.838.

An electronics for active cancellation of a pulsating flow with a source noise reference. The electronics includes a signal processor configured to receive a noise source signal and a flow signal The signal processor is also configured to generate a cancelling signal based on the noise source signal and the flow signal. A controller is communicatively coupled to the signal processor and configured to determine a flow rate control signal for controlling the flow rate of the pulsating flow A signal generator coupled to the signal processor and the controller is configured to receive the flow rate control signal, generate a valve signal based on the flow rate control signal and the cancelling signal, and provide the valve signal to a valve to control the flow rate and attenuate the one or more pulses of the pulsating flow.

Fluid delivery devices using a pair of meshed external gears, in spite of no reciprocating component for fluid delivery enabling low rotational vibration, the high noise due to the trapping phenomenon, and the teeth bouncing contact due to undesired large backlash heretofore afforded in the gear manufacturing process, restrict the employments in the industrial field requiring quiet environment such as electric motor vehicles or room services. Accordingly, a gear pump or motor or a gear refrigerating compressor comprising a shaft gear and a driven gear meshed rotatably within a gear chamber formed with a housing and opposite side walls, which delivers fluids from a inlet chamber to a outlet chamber; a backlash of the meshed gears having fluid-leak-tight clearance; a closed chamber provided in a internal portion of at least a side wall; an opening provided on a side wall from which a communication passage extends to a closed chamber; and at least a elastic disc capsule contained in the closed chamber, comprising a pair of concaved elastic disc plate abutted and sealed against each other with gas inside, of which occupying volume varies elastically subject to the fluid pressure therein enabling to absorb or expel the squeezed fluid in the trapped interstice during the trapping period of the interstice, whereby the fluid entrapped in the interstices isolated by the fluid-leak-tight backlash suppressing the pressure transmission inwardly or outwardly, whereof volumetric variation during the trapping period is compensated by the compression or expansion of the elastic disc capsule, suppressing pressure pulse and air bubble generation and eliminating the teeth bouncing contact, achieving a low noise, low vibration and high efficiency gear pump or motor or refrigerating compressor.

An electric compressor includes a compression part, a motor, and an inverter device. The inverter device has an inverter circuit unit and a noise reduction unit that reduces common mode noise and normal mode noise. The noise reduction unit has a common mode choke coil that has a core, a first winding wire, and a second winding wire and reduces the common mode noise, a smoothing capacitor, and a magnetic material damping portion in which an eddy current is induced by a leakage magnetic flux leaked from the core. The magnetic material damping portion reduces the normal mode noise. The noise reduction unit has a plurality of the magnetic material damping portions. The plurality of the magnetic material damping portions are stacked with an insulation layer interposed therebetween.

A system for noise and vibration management of a smoke evacuation system includes a pump that compresses air and produces a pressure differential within an airflow path. The pump may be a sealed, positive displacement pump. The system includes vibration absorption mechanisms disposed between inner and outer housings, as well as on the outside surface of the outer housing. Methods of controlling and regulating a motor of the system to preserve the lifespan of the motor and maintain consistent airflow rates throughout the smoke evacuation system include varying a supply of electrical current to the motor so that it can operate at variable performance levels. Orifices are opened and closed in order to relieve resistance pressures within the airflow path due to clogging and blockages.

A system for noise and vibration management of a smoke evacuation system includes a pump that compresses air and produces a pressure differential within an airflow path. The pump may be a sealed, positive displacement pump. The system includes vibration absorption mechanisms disposed between inner and outer housings, as well as on the outside surface of the outer housing. Methods of controlling and regulating a motor of the system to preserve the lifespan of the motor and maintain consistent airflow rates throughout the smoke evacuation system include varying a supply of electrical current to the motor so that it can operate at variable performance levels. Orifices are opened and closed in order to relieve resistance pressures within the airflow path due to clogging and blockages.

A scroll compressor includes a compression mechanism with a compression chamber. The compression chamber is a combination of a fixed scroll and an orbiting scroll, and is to compress working gas. The fixed scroll includes a main port, and a plurality of sub-ports. The main port is a port through which the working gas compressed in the compression chamber is to be discharged. The sub-ports are ports through which the working gas over-compressed in the compression chamber is to be discharged. The scroll compressor includes a rotary shaft, and a silencing chamber. The rotary shaft drives the compression mechanism. The silencing chamber is disposed downstream of the main port with respect to the flow of the working gas. The silencing chamber includes a discharge hole, an expansion part, and a plurality of chamber sub-ports. The discharge hole is a hole through which the working gas is to be discharged.