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91results about How to "Suppression of abnormal noise" patented technology

Motor control apparatus, vehicle fan drive apparatus, and motor control method

A motor control apparatus has a start control section. When the motor control apparatus receives a motor start command from a host control unit when a motor is in a stop state or a low-speed rotating state where a sensorless control cannot be applied, the control section starts the motor that rotates a vehicle fan by a forced commutation which supplies a pseudo sinusoidal drive signal caused by a complementary PWM control. Thereafter, the motor control apparatus switches over to a sensorless control using a rectangular wave drive signal at an energization angle of lower than 180°.
Owner:DENSO CORP

Image forming apparatus that applies necessary amount of lubricant to image bearing member

InactiveUS20130017006A1Preventing the lubricant from being excessively consumedSuppression of abnormal noiseElectrographic process apparatusImage formationMotor control
An image forming apparatus configured to apply a necessary amount of a lubricant to an image bearing member while preventing the lubricant from being excessively consumed. An intermediate transfer belt drive motor controlled by a PID controller drives an intermediate transfer belt. A brush rotation controller for controlling an application brush drive motor detects fluctuation in a frictional force between a cleaning blade and the intermediate transfer belt, and controls the application brush drive motor such that an amount of lubricant to be applied is an amount corresponding to the detected fluctuation in the frictional force.
Owner:CANON KK

Two-stage decompression ejector and refrigeration cycle device

A two-stage decompression ejector includes a variable throttle mechanism having a first throttle passage for decompressing a fluid and a valve body for changing a throttle passage area of the first throttle passage, a nozzle having therein a second throttle passage for further decompressing the fluid decompressed by the variable throttle mechanism, and a suction portion for drawing a fluid by a suction effect of a high-velocity jet fluid from the nozzle. The formula of 0.07≦Vo×S / vn≦0.7 is satisfied, in which Vo is an intermediate-pressure space volume (mm3) from an outlet of the variable throttle mechanism to an inlet of the second throttle passage, S is a throttle passage sectional area (mm2) of a minimum passage sectional area portion of the second throttle passage, and vn is a flow velocity (mm / s) of the fluid passing through the minimum passage sectional area portion.
Owner:DENSO CORP

Damper, Air Conditioning Unit and Vehicular Air Conditioning System

Provided are a damper in which strange sound (whistling sound) generated when the damper has a small opening degree is suppressed, an air conditioning unit, and an air conditioner for vehicle. The damper has a wall surface (33) for forming a channel for allowing air to flow in it, a stationary portion (35) extending from the wall surface (33) toward the center of the channel (23), and a rotation portion (25) rotatably placed in the channel (23) and having one end (29) in contact with a portion of the stationary portion (35), which portion is on the downstream side of air flow in the channel (23). A curved wall portion (45) curved and projected toward the center of the channel (23) is formed at that position on the wall surface (33) with which the air flow passed between one end (29) and the stationary portion (35) collides.
Owner:MITSUBISHI HEAVY IND LTD

Motor drive device

A motor drive device has a drive circuit for driving a motor, and a control section for controlling the drive circuit. The control section has a current command value calculating portion for calculating a current command value, a rotation calculating portion for calculating a rotation angle and an angular speed of the motor, a current command value correcting portion for correcting the current command value based on the rotation angle, a voltage command value calculating portion for calculating a voltage command value based on the current command value, a voltage command value correcting portion for correcting the voltage command value based on the current command value and the rotation angle and the angular speed, and a drive signal generating portion for generating a drive signal based on the voltage command value.
Owner:OMRON AUTOMOTIVE ELECTRONICS CO LTD

Hinge mechanism

A hinge mechanism includes: a bracket 2 having a rotation shaft portion insertion hole 2a for inserting through a marginal rotating shaft portion 3b thereof, and one engaging concavo-convex section 2b; a plate 5 having a mounting shaft portion insertion hole 5a; and a leaf spring 4 having a mounting shaft portion insertion hole 4a and the other engaging concavo-convex section 4c, and located between the bracket 2 and plate 5 and mounted to the rotation shaft 3, wherein the hole 5a is formed larger than the hole 4a such that the spring 4 is caulked and fixed to the end face of the shaft portion by entering of the outer wall side part of a mounting shaft portion 3c formed on the end face of the portion 3b that is collapsed by caulking into a gap 5c formed between the portion 3c and insertion hole 5a.
Owner:MITSUBISHI ELECTRIC CORP

Toner for electrostatic image development, toner cartridge, process cartridge and image forming apparatus

The invention provides a toner for electrostatic image development, a toner cartridge, a process cartridge and an image forming apparatus. The toner for electrostatic image development contains a toner particle and external additive particles adhered to the surface of the toner particle, each of the external additive particles being constituted of plural irreversibly coalesced primary particles.
Owner:FUJIFILM BUSINESS INNOVATION CORP

Energization timing determination circuit and determination method for energization timing of motor

An energization timing determination circuit corrects a shift contained in a position signal outputted from a position detecting means and supplies energization timing appropriate to drive a motor. A correction amount computation unit computes detection intervals obtained based on position signals outputted from filters, comparators, and a position detection unit during one cycle of electrical angle. The correction amount computation unit thereby determines the duty shift length α and phase shift length β of the position signals. A control circuit corrects energization timing based on the position signals according to the detected shift lengths.
Owner:DENSO CORP

Webbing take-up device

ActiveUS20110309179A1Suppress (rattling) noiseSuppression of abnormal noiseBelt retractorsEngineeringClutch
The present invention is to suppress a generation of a noise due to repeatedly hitting a clutch plate against a clutch cover and a clutch guide. A webbing take-up device is provided with a clutch cover fixed to a sub-torsion shaft so as to be rotatable integrally therewith; a clutch guide arranged so as to face the clutch cover, and supported capable of relatively rotating to the sub-torsion shaft; a lock ring formed around the clutch cover and the clutch guide; and a clutch plates turned to a lock ring side while being guided by the clutch guide in accordance with relative rotation of the clutch guide to the clutch cover into one rotational direction, and engaged with the lock ring. L-shaped springs which urge the clutch plates to a clutch cover side are formed integrally with the clutch guide.
Owner:KK TOKAI RIKA DENKI SEISAKUSHO

Automobile

InactiveUS20160160775A1Improve warm-upSuppresses relatively large delayed amountHybrid vehiclesAnalogue computers for vehiclesInlet valveEngineering
When a conversion catalyst in a catalytic converter is warmed up, a required efficiency ηtag is set such as to be within a range of less than 1 that is a value when the conversion catalyst is not warmed up and to increase with an increase in delay of an open-close timing VT of an intake valve (steps S130 to S160). A delayed amount of a target ignition timing IT* is decreased with an increase in required efficiency ηtag (closer to the value 1) (steps S170 and S180).
Owner:TOYOTA JIDOSHA KK

Electric motor and electric unit including the same

A pump housing, a fixing member and a holding member are assembled in the axis direction of an oil pump to fix a stator and a rotor of a brushless motor. The holding member is made of metal material and has a cylindrical shape that extends from its bottom portion toward one side in the axial direction. The fixing member is a cylindrical metal member. Stepped portions, extending in the circumferential direction, are formed in the outer periphery of the holding member and the inner periphery of the fixing member, and contact each other. The outer periphery of the holding member engages with the inner periphery of the fixing member. The outer periphery of the other end portion of the fixing member is fitted to the inner periphery of a flange portion projecting from the end face of the pump housing, which is adjacent to the brushless motor.
Owner:JTEKT CORP

Throttle valve device

The invention provides a throttle valve device, which can improve removing performance of freezing between a valve core and a hole inner wall of a throttle valve. The throttle valve device is characterized in that, a throttle valve shaft (4) is made to rotate via use of a motor, etc. An opening degree, which is decided by a throttle valve core (5), of a hole (11) is changed, and air inlet flow of the hole is adjusted. The throttle valve shaft is supported to be rotatable by a pair of sliding bearings (21A, 21B) disposed corresponding to two end parts of the throttle valve shaft. Two bearings are disposed at a throttle valve body (2) or a throttle valve pipe (12) in a mode that the throttle valve shaft is adjacent to a downstream side end (11b) of the hole. When the throttle valve core becomes a closed state of almost completely closing the hole, the throttle valve core is configured to form a specified closed angle (theta 1) with the radial direction of the hole, one end part (5a) of the throttle valve is adjacent to a downstream side end of the hole. When the throttle valve core starts to open the hole, one end part (5a) of the throttle valve is immediately exposed.
Owner:AISAN IND CO LTD

Gas compressor

A gas compressor provided with a cylinder block, a rear side block, a front side block, a cylinder chamber formed by the three blocks, a rotor rotatably provided in the cylinder chamber, vane grooves formed in the rotor, vanes inserted in the vane grooves, and a suction hole provided in either the front side block and / or the rear side block. A refrigerant is sucked into the cylinder chamber from the suction hole. The edge of the opening of the suction hole is composed of an in-chamber opening edge located within the cylinder chamber and of an in-block opening edge facing the side wall of the cylinder block. The in-chamber opening edge is located on the elliptic inner wall side from the outer periphery of the rotor. The configuration suppresses the tilt of the vanes and also suppresses cut damage and wear of the blocks, vibration, and noise.
Owner:CALSONIC KANSEI CORP

Vortex compressor as well as fixed vortex member and movable vortex member

The invention discloses a vortex compressor as well as a fixed vortex member and a movable vortex member. On the one hand, the vortex compressor comprises a compression mechanism, an exhaust port and an emission space, wherein the compression mechanism comprises a fixed vortex member and a movable vortex member, the fixed vortex member comprises a fixed vortex end plate and a fixed vortex roll, the movable vortex member comprises a movable vortex end plate and a movable vortex roll, and the fixed vortex roll and the movable vortex roll are combined together to limit a plurality of compression chambers including first compression chambers and second compression chambers; the exhaust port is suitable for communicating with the first compression chambers; and the emission space is suitable for communicating with the exhaust port. The first compression chambers, the exhaust port and the emission space form a high-pressure area. The vortex compressor also comprises a communicating passage which is set to ensure that at least one of the second compression chambers and the high-pressure area can be communicated with each other before a vortex roll separation point. According to the invention, the pressure of the first / center compression chambers can be changed more gently, so that the problem of high noise can be effectively solved, and the energy efficiency ratio and working stability of the compressor can be improved.
Owner:EMERSON CLIMATE TECH (SUZHOU) CO LTD
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