Motor rotor and permanent magnet motor
A technology for motor rotors and permanent magnets, which is applied to magnetic circuits, synchronous motors with stationary armatures and rotating magnets, electric components, etc. Demagnetization ability, reduction of magnetization difficulty, effect of reduction of magnetization current
Pending Publication Date: 2018-12-21
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0004] Based on this, it is necessary to provide a motor rotor and a permanent magnet motor that can take into account the efficiency of both high frequency and low frequency in order to solve the problem that the traditional permanent magnet motor is difficult to take into account the efficiency of high frequency and low frequency.
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[0024] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0025] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes ...
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The invention relates to a motor rotor and a permanent magnet motor, The motor rotor comprises a rotor iron core; An even number of first permanent magnets arranged along a circumferential interval ofthe rotor core on an axial end face of the rotor core; And at least two second permanent magnets having a coercive force greater than that of the first permanent magnet, each of the second permanentmagnets being spaced apart between the two adjacent pairs of the first permanent magnets, and each of the second permanent magnets being arranged in series with two adjacent first permanent magnets. By changing the magnetic field strength of the first permanent magnet with low coercivity by magnetization current, the adjustable magnetic field of the permanent magnet motor is realized, so that theefficiency of the permanent magnet motor at both high frequency and low frequency is realized. At the same time, when the first permanent magnet is magnetized, two first permanent magnets without a second permanent magnet are magnetized directly, so that the second permanent magnet with high coercivity is avoided, the magnetization current is reduced, and the magnetization difficulty is greatly reduced.
Description
technical field [0001] The invention relates to the technical field of driving devices, in particular to a motor rotor and a permanent magnet motor. Background technique [0002] The permanent magnet motor mainly includes a stator and a rotor. The rotor includes a rotor core and permanent magnets. The permanent magnets are installed in the magnetic steel slots of the rotor core. When the three-phase symmetrical current is passed into the stator side, since the three-phase stators have a difference of 120° in space, the three-phase stator current generates a rotating magnetic field in space, and the rotor moves under the action of electromagnetic force in the rotating magnetic field. At this time, the electric energy is converted Kinetic energy; when the permanent magnet generates a rotating magnetic field, the three-phase stator winding reacts through the armature under the action of the rotating magnetic field to induce a three-phase symmetrical current, and the kinetic ene...
Claims
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IPC IPC(8): H02K1/27H02K21/16
CPCH02K1/2766H02K21/16H02K2213/03
Inventor 肖勇王敏尚文海
Owner GREE ELECTRIC APPLIANCES INC