Electronic expansion valve, control system, and control method
AssigneeHangzhou Sanhua Research Institute Co., Ltd.
InventorsBin Zhang, Yaofeng Lan, Junxiao Jiang
Life of this patent
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Abstract
Provided are an electronic expansion valve, a control system, and a control method, including: a step motor and a Hall sensor; the step motor includes a rotor and a stator; the rotor includes a permanent magnet; the Hall sensor is provided on the outer periphery of the permanent magnet; the Hall sensor and rotor are arranged in the radial direction, and the stator and Hall sensor are arranged in the axial direction; the main-body part of the Hall sensor is used for sensing the magnetic pole change of the permanent magnet; such a structure reduces the effect that an operating environment has on the Hall sensor when detecting a signal.
Claims8
An electronic expansion valve, comprising a stepping motor, a Hall sensor, and a circuit board, wherein
- the stepping motor comprises a rotor and a stator, the rotor comprises a permanent magnet, the permanent magnet comprises at least two pairs of magnetic poles, the stator comprises a coil and a stator core, the stator core comprises a magnetic conductive portion, and the magnetic conductive portion is arranged at a periphery of the permanent magnet;
- wherein the stepping motor comprises an injection molding portion, and the injection molding portion comprises a first partition portion and a second partition portion;
- the Hall sensor is arranged at the periphery of the permanent magnet, and the Hall sensor is located at one end of the magnetic conductive portion;
- the Hall sensor comprises a body portion and a connecting portion, both the connecting portion and the coil are electrically connected to the circuit board, and the body portion is configured to sense magnetic pole changes of the permanent magnet;
- and
- a sum of a length of the body portion and a length of the magnetic conductive portion is less than a length of the permanent magnet;
- the Hall sensor is arranged at the periphery of the first partition portion, a projection portion is formed at the second partition portion, a mounting portion is formed between the projection portion and the first partition portion, and the Hall sensor is arranged at the mounting portion.
Dependencies are inferred from the claim text.