Guangdong Meizhi Compressor Co., Ltd.

Western Digital Technologies, Inc.

Guangdong Oppo Mobile Telecommunications Corp., Ltd.

Cheng Zhang

Hong Guo

Jijiang Yu

Weimin Xiang

Masao Ozu

Ling Wang

Jingtao Yang

Liang Zhong

Xingbiao Zhou

Lili Yan

Bin Gao

Yongjun Fu

Guoyong Yang

Liyu Zheng

Wanjie Song

Xinjie Ren

Siqing Liao

Ziqiang Liang

Ao Fan

Lingyun Li

Guanfeng Luo

A disk hub is configured to retain a magnetic recording medium including an annulus shape and a layer configured for magnetic recording. The disk hub includes a base plate portion for supporting an inner diameter area of the magnetic recording medium and a stem portion on the base plate portion. The stem portion includes a frustoconical portion on the base plate portion and a top portion on the frustoconical portion. At least the top portion of the stem portion includes a material with a hardness less than that of stainless steel. The disk hub can reduce surface damages (e.g., scratches) on the media surface during media testing.

Disk hub for retaining magnetic recording media for film thickness measurement

A control method is applied in the mobile terminal. The mobile terminal includes a terminal body and a camera assembly, the camera assembly is disposed inside the terminal body and is movable relative to the terminal body to move out of the terminal body. The mobile terminal displays a first interface, acquires interface information of the first interface; determines a second interface based on the interface information of the first interface, wherein the second interface is a next interface following the first interface and forecasted by the mobile terminal; determines whether a function supported by the second interface requires the camera assembly to be activated; and controls the camera assembly to move out of the terminal body in response to the function supported by the second interface requiring the camera assembly to be activated.

Method and apparatus for controlling terminal, and mobile terminal for determining whether camera assembly supported functionality is required

An electric compressor and a refrigeration device having the same are provided. The electric compressor includes: an electric motor having a stator and a rotor; a compressing mechanism having an eccentric shaft rotatably and slidably connected to the rotor and defining a compressing chamber therein, the compressing chamber being configured to perform a compression by the eccentric shaft; and a torque damping device configured to connect the rotor with the eccentric shaft, in which during the compression of the compressing chamber, a difference between a rotation angle of the eccentric shaft and a rotation angle of the rotor is a phase angle which is increased and decreased.

Electric compressor and refrigeration device having same

A refrigeration cycle device includes at least a condenser, an expansion valve, an evaporator and a plurality of compressors, a sealed casing of each of the compressors is disposed with a rotary compression mechanism part in communication with a low-pressure path and a motor part configured to drive the compression mechanism part, the low-pressure path is in communication with the evaporator, each of the compressors is further provided with an oil storage cavity, and a gas discharge path of at least one compressor is connected with the sealed casing of another compressor.

Refrigeration cycle device

A compression device includes an air cylinder (); an upper bearing () and a lower bearing (); a piston () which defines a working space; a first slide vane () and a second slide vane () which separate the working space into a first and a second working chamber; a first air suction port () and a second air suction port () both of which are in communication with the working space; and a first air discharge port () and a second air discharge port () both of which are in communication with the working space. The first and the second air suction port satisfy the following condition: 0.25&#x2264;(V/S)*(S/V)&#x2264;4, where VI and Vare respectively the maximum volume of the first and the second working chamber, and Sand Sare respectively the opening area of the first and the second air suction port.

Rotary compressor and compression unit thereof, and air conditioner

A rotatory compressor and a refrigerating cycle device are provided. The rotatory compressor includes a lubricating oil in an interior of a hermetically sealed housing, and an electric motor and a rotatory compressing mechanism disposed in the housing. An internal pressure of the housing is substantially equal to a suction pressure of the compressing mechanism. The compressing mechanism includes a first bearing and a second bearing at least one of which includes an exhaust muffler. A refrigerant of the exhaust muffler flows through the sliding vane chamber and is discharged from an exhaust pipe of the compressing mechanism.

Rotatory compressor and refrigerating cycle device

A refrigerant filling rotary compressor includes a shell, a compressing mechanism, an injection tube and an injection valve assembly. The compressing mechanism includes a cylinder, a main bearing, an auxiliary bearing, a crank shaft, a piston and a sliding vane. An inner wall of the cylinder chamber of the cylinder is formed with a filling mouth, and the cylinder is provided with a filling channel with a filling hole. The injection valve assembly is in a closed state when a pressure inside the cylinder chamber is higher than that in the filling hole so as to separate the filling hole from the filling mouth, and the injection valve assembly is in an open state when the pressure inside the cylinder chamber is lower than that in the filling hole so as to communicate the filling hole with the filling mouth, in which when the injection valve assembly is in the closed state, a space between the injection valve assembly and the filling mouth where a compressed gas exists is termed a clearance volume formed by the injection valve assembly, and a ratio between the clearance volume formed by the injection valve assembly and a reserve volume of the cylinder ranges from 0.3% to 1.5%.

Refrigerant filling rotary compressor

A method for suppressing a speed fluctuation of a permanent magnet synchronous motor is provided in the present disclosure, including: obtaining a target speed &#x3c9;_, a feedback speed, a fluctuation speed &#x394;&#x3c9;, a q-axis inductance Land a permanent magnet flux linkage &#x3c6;of the permanent magnet synchronous motor; performing a PI adjusting on &#x394;&#x3c9; to obtain a q-axis reference current I, and obtaining a q-axis target voltage U*according to I, &#x3c9;_, &#x394;&#x3c9; and &#x3c6;; performing a PI control on a q-axis actual voltage according to U*to obtain a q-axis compensation current I; obtaining a d-axis target voltage U*according to I, I, &#x3c9;_, &#x394;&#x3c9; and L; performing a PI control on a d-axis actual voltage according to U*to obtain a d-axis compensation current I; superposing Iand Ito perform a feedforward compensation on a q-axis current and superposing Iand the d-axis reference current to perform a feedforward compensation on a d-axis current.

Method for suppressing a speed fluctuation, a control apparatus and a compressor control system

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Foshan, China

Cheng Zhang