Abstract: An electronic expansion valve including a rotor, a stator and a circuit board the rotor includes a permanent magnet, and the permanent magnet includes at least two pairs of magnetic poles; the stator includes a coil and a bobbin, wherein the coil is supported by the bobbin, and the bobbin is disposed at the periphery of the permanent magnet. Also included is a Hall sensor, which is disposed on the periphery of the permanent magnet; the Hall sensor and the coil are electrically connected to the circuit board; the Hall sensor includes a sensing portion, and the sensing portion is used for sensing magnetic pole change of the permanent magnet; the sensing portion is always located between the two ends of the permanent magnet during the entire operating process of the rotor.

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.

Abstract: An electric valve includes a stator assembly, a rotor, a circuit board assembly, a sleeve and a valve assembly. The stator assembly is arranged around the rotor. The sleeve isolates the stator assembly from the rotor. The stator assembly is electrically connected to the circuit board assembly. A valve port is formed in the electric valve. The rotor can drive the movement of the valve assembly with respect to the valve port. The electric valve further comprises a box body. The circuit board assembly is arranged in the box body. The box body includes a shell and a cover body. A seal ring is arranged at a joint of the shell and the cover body. The seal ring is compressed between the shell and the cover body. The cover body is fixedly connected to the shell by means of welding.

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.

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 said permanent magnet; such a structure reduces the effect that an operating environment has on the Hall sensor when detecting a signal.

Abstract: An electric valve includes a stator assembly, a rotor, a circuit board assembly, a sleeve and a valve assembly. The stator assembly is arranged around the rotor. The sleeve isolates the stator assembly from the rotor. The stator assembly is electrically connected to the circuit board assembly. A valve port is formed in the electric valve. The rotor can drive the movement of the valve assembly with respect to the valve port. The electric valve further comprises a box body. The circuit board assembly is arranged in the box body. The box body includes a shell and a cover body. A seal ring is arranged at a joint of the shell and the cover body. The seal ring is compressed between the shell and the cover body. The cover body is fixedly connected to the shell by means of welding.

Abstract: An electronic expansion valve including a rotor, a stator and a circuit board the rotor includes a permanent magnet, and the permanent magnet includes at least two pairs of magnetic poles; the stator includes a coil and a bobbin, wherein the coil is supported by the bobbin, and the bobbin is disposed at the periphery of the permanent magnet. Also included is a Hall sensor, which is disposed on the periphery of the permanent magnet; the Hall sensor and the coil are electrically connected to the circuit board; the Hall sensor includes a sensing portion, and the sensing portion is used for sensing magnetic pole change of the permanent magnet; the sensing portion is always located between the two ends of the permanent magnet during the entire operating process of the rotor.

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 said permanent magnet; such a structure reduces the effect that an operating environment has on the Hall sensor when detecting a signal.