Patents by Inventor Wanzhen Liu

Wanzhen Liu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210058019
    Abstract: A compressor and a control method thereof are provided. The compressor includes a motor with a rotor of a permanent magnet. According to embodiments, the method of controlling the compressor includes: applying a detection current to the motor in response to a command of starting the compressor; detecting whether there is demagnetization of the permanent magnet of the rotor according to a response of the motor to the applied detection current; resetting an operating parameter of the compressor if there is the demagnetization; and starting the compressor according to the reset operating parameters. According to embodiments of the present disclosure, when the compressor is to be started, demagnetization is detected first, and the operating parameter are set accordingly, so as to suppress or avoid performance degeneration due to the demagnetization.
    Type: Application
    Filed: July 29, 2020
    Publication date: February 25, 2021
    Inventors: Shizhong Ji, Li Yao, Wanzhen Liu
  • Publication number: 20200244116
    Abstract: Embodiments of the present disclosure provide a motor rotor and a motor. The motor rotor includes: multiple groups of laminations having inner bores and arranged alternately in an axial direction of the motor rotor. The motor includes a stator and the abovementioned motor rotor provided in the stator. The motor rotor and the motor according to embodiments of the present disclosure, for example, may reduce installation costs of the laminations and a rotor shaft in the motor rotor.
    Type: Application
    Filed: December 27, 2018
    Publication date: July 30, 2020
    Inventors: Wanzhen Liu, Li Yao, Yan Lin, Guangqiang Liu, Zhenyu Wang, Weiping Tang, Meng Wang
  • Patent number: 10658891
    Abstract: Embodiments describe a motor. The motor includes a stator, and a rotor, which is arranged within the stator. An end part of at least one air-gap slot of the rotor has an offset with a predetermined distance and/or a predetermined angle relative to a main body part adjacent immediately to the end part. With the offset of a predetermined distance and/or a predetermined angle configured at the end part of at least one air-gap slot of the rotor, ripple torque of the motor is effectively lower down while complexity of the motor, stator or rotor will not be increased.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: May 19, 2020
    Assignee: DANFOSS (TIANJIN), LTD.
    Inventors: Wanzhen Liu, Li Yao, Yan Lin, Guangqiang Liu, Zhenyu Wang, Meng Wang, Weiping Tang
  • Patent number: 10389216
    Abstract: A stator, a motor and a compressor are provided. The stator includes a stator iron core and a winding. The stator iron core includes: an annular yoke; multiple stator teeth, near ends of the stator teeth being fixedly adjacent to an inner surface of the yoke and projecting inward towards the center of the stator iron core along a radial direction of the yoke, remote ends of the stator teeth that face inward along the radial direction defining a center hole for accommodating a rotor, and the stator teeth being spaced from each other in a circumferential direction; and multiple stator slots, each stator slot being defined between two neighboring stator teeth. The winding is wound around the stator teeth and operable for generating a rotating magnetic field. The yoke has at least two cut edges at an outer periphery thereof, disposed asymmetrically relative to the center.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: August 20, 2019
    Assignee: Danfoss (Tianjin) Ltd.
    Inventors: Weiping Tang, Li Yao, Wanzhen Liu, Guangqiang Liu, Yan Lin, Zhenyu Wang, Meng Wang
  • Publication number: 20190207443
    Abstract: Embodiments of the present disclosure provide a motor rotor and a motor. The motor rotor includes: multiple groups of laminations having inner bores and arranged alternately in an axial direction of the motor rotor. The motor includes a stator and the abovementioned motor rotor provided in the stator. The motor rotor and the motor according to embodiments of the present disclosure, for example, may reduce installation costs of the laminations and a rotor shaft in the motor rotor.
    Type: Application
    Filed: December 27, 2018
    Publication date: July 4, 2019
    Inventors: Wanzhen Liu, Li Yao, Yan Lin, Guangqiang Liu, Zhenyu Wang, Weiping Tang, Meng Wang
  • Patent number: 10090793
    Abstract: An electric motor, a compressor including the electric motor and a method for controlling the electric motor or the compressor are provided. The electric motor includes: a stator; single-phase or multiphase windings disposed on the stator; and a rotor, where the rotor includes a permanent magnet, and at least part of the permanent magnet is ferrite. By using a permanent magnet synchronous motor in a variable-speed compressor, costs of the variable-speed compressor are significantly reduced, and the performance thereof is basically the same as that of a variable-speed compressor using a rare-earth permanent magnet synchronous motor. By controlling the electric motor or the compressor, costs of the electric motor or the compressor are reduced, and moreover, and the ferrite in the electric motor can be protected from irreversible demagnetization at a low temperature, thereby improving the reliability of the compressor.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: October 2, 2018
    Assignee: Danfoss (Tianjin) Ltd.
    Inventors: Wanzhen Liu, Li Yao, Yan Lin, Zhenyu Wang
  • Publication number: 20170194845
    Abstract: A stator, a motor and a compressor are provided. The stator includes a stator iron core and a winding. The stator iron core includes: an annular yoke; multiple stator teeth, near ends of the stator teeth being fixedly adjacent to an inner surface of the yoke and projecting inward towards the center of the stator iron core along a radial direction of the yoke, remote ends of the stator teeth that face inward along the radial direction defining a center hole for accommodating a rotor, and the stator teeth being spaced from each other in a circumferential direction; and multiple stator slots, each stator slot being defined between two neighboring stator teeth. The winding is wound around the stator teeth and operable for generating a rotating magnetic field. The yoke has at least two cut edges at an outer periphery thereof, disposed asymmetrically relative to the center.
    Type: Application
    Filed: December 28, 2016
    Publication date: July 6, 2017
    Inventors: Weiping Tang, Li Yao, Wanzhen Liu, Guangqiang Liu, Yan Lin, Zhenyu Wang, Meng Wang
  • Publication number: 20170187257
    Abstract: Embodiments describe a motor. The motor includes a stator, and a rotor, which is arranged within the stator. An end part of at least one air-gap slot of the rotor has an offset with a predetermined distance and/or a predetermined angle relative to a main body part adjacent immediately to the end part. With the offset of a predetermined distance and/or a predetermined angle configured at the end part of at least one air-gap slot of the rotor, ripple torque of the motor is effectively lower down while complexity of the motor, stator or rotor will not be increased.
    Type: Application
    Filed: December 28, 2016
    Publication date: June 29, 2017
    Inventors: Wanzhen Liu, Li Yao, Yan Lin, Guangqiang Liu, Zhenyu Wang, Meng Wang, Weiping Tang
  • Publication number: 20150188480
    Abstract: An electric motor, a compressor including the electric motor and a method for controlling the electric motor or the compressor are provided. The electric motor includes: a stator; single-phase or multiphase windings disposed on the stator; and a rotor, where the rotor includes a permanent magnet, and at least part of the permanent magnet is ferrite. By using a permanent magnet synchronous motor in a variable-speed compressor, costs of the variable-speed compressor are significantly reduced, and the performance thereof is basically the same as that of a variable-speed compressor using a rare-earth permanent magnet synchronous motor. By controlling the electric motor or the compressor, costs of the electric motor or the compressor are reduced, and moreover, and the ferrite in the electric motor can be protected from irreversible demagnetization at a low temperature, thereby improving the reliability of the compressor.
    Type: Application
    Filed: December 23, 2014
    Publication date: July 2, 2015
    Inventors: Wanzhen Liu, Li Yao, Yan Lin, Zhenyu Wang
  • Publication number: 20150042200
    Abstract: A rotor (24) of an interior permanent magnet motor and an interior permanent magnet motor (20) are disclosed. The rotor (24) of the interior permanent magnet motor includes a rotor iron core (25); a plurality of permanent magnets (27), where the plurality of permanent magnets (27) are spaced apart inside the rotor iron core (25); and a plurality of air slots (30), disposed at end portions of adjacent permanent magnets (27) and close to an outer circumference of the rotor, and adapted to generate air gap flux density between the outer circumference of the rotor and an inner circumference of a stator of the interior permanent magnet motor, and the air gap flux density being in an analogous sinusoidal shape.
    Type: Application
    Filed: November 23, 2012
    Publication date: February 12, 2015
    Inventors: Li Yao, Wanzhen Liu, Zhenyu Wang, Yan Lin
  • Publication number: 20150010414
    Abstract: The present invention provides a stator, a three-phase induction motor and a compressor. The stator is applied to a three-phase induction motor of a compressor. The stator includes: a stator iron core; a plurality of stator teeth extending inwards along a radial direction of the stator; stator slots distributed between the plurality of stator teeth; and three phases of windings wound around the stator teeth to generate a rotating magnetic field, where a coil of each phase of winding in the three phases of windings is made of a composite wire. The composite wire includes a wire core made of a first conductive metal material, and an outer layer wrapping an outer circumferential surface of the wire core and made of a second conductive metal material, wherein the first conductive metal material and the second conductive metal material have different electrical conductivities.
    Type: Application
    Filed: July 1, 2014
    Publication date: January 8, 2015
    Inventors: Weiping Tang, Li Yao, Wanzhen Liu, Guangqiang Liu, Yan Lin, Zhenyu Wang
  • Publication number: 20150010412
    Abstract: A stator, a motor and a compressor are provided. A stator applied to a motor includes: a stator iron core; a plurality of stator teeth extending inwards along a radial direction of the stator; stator slots distributed between the plurality of stator teeth; and a winding wound around the stator teeth to generate a rotating magnetic field, where at least one phase of winding or a coil forming the at least one phase of winding is formed by different wires, and the different wires are connected in a serial or serial-parallel manner to form the coil or the least one phase winding.
    Type: Application
    Filed: July 1, 2014
    Publication date: January 8, 2015
    Inventors: Wanzhen Liu, Li Yao, Yan Lin, Guangqiang Liu, Zhenyu Wang, Weiping Tang