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1. Permanent magnet DC motor
Composition structure: This type of electric vehicle motor is composed of stator poles, rotor, brushes, and housing.
Specific introduction: Its stator poles use permanent magnets, including ferrite, Al-Ni-Co and other materials, and can be divided into cylinder type and tile type according to its structure; its rotor is generally laminated with silicon steel sheets. The enameled wire is wound between the two slots of the rotor core, and its joints are respectively welded to the metal sheet of the commutator; the brush is a conductive part that connects the power supply and the rotor winding, and has both conductivity and wear resistance. Currently, electric vehicle motors generally adopt this form.
2. Brushless DC motor
Composition structure: It is composed of permanent magnet rotor, multi-pole winding stator, position sensor, etc., and has the advantages of high reliability, no commutation sparks, and low mechanical noise.
Specific introduction: The brushless DC motor is characterized by brushless, which uses semiconductor switching devices to realize electronic commutation, that is, electronic switching devices are used to replace traditional contact commutators and brushes; its position sensor is based on the rotor position The change of, the current of the stator winding can be commutated along a certain sequence.
3. High-speed permanent magnet brushless motor
Composition structure: It is composed of stator core, magnetic steel rotor, sun gear, deceleration clutch, etc.
Specific introduction: This kind of electric vehicle motor can also be equipped with a Hall sensor on the cover for speed measurement.
Knowledge Zone: There are three types of position sensors for electric vehicle motors: magnetic, photoelectric and electromagnetic. The brushless DC motor with magnetic-sensitive position sensor, whose magnetic sensor is mounted on the stator assembly, can be used to detect the magnetic field changes generated when the permanent magnet and rotor rotate; the brushless DC motor with photoelectric position sensor is The stator assembly is equipped with a photoelectric sensor at a certain position; the brushless DC motor that uses an electromagnetic position sensor is equipped with an electromagnetic sensor component on the stator assembly. When the position of the permanent magnet rotor changes, the electromagnetic sensor will produce high Frequency modulation signal.
