Brushless excitation mechanism based on wireless transmission of electric energy

Abstract

The invention discloses a brushless excitation mechanism based on wireless transmission of electric energy. The mechanism comprises a high frequency excitation source, an auxiliary excitation transmitting coil, an auxiliary excitation receiving coil, a rotating rectifier bridge, a soft magnetism optimization layer and a metal shielding layer, wherein the high frequency excitation source and the auxiliary excitation transmitting coil are arranged outside a motor, the auxiliary excitation receiving coil, the rotating rectifier bridge, the soft magnetism optimization layer and the metal shielding layer are arranged in the motor, an electromagnetic field of an excitation system is optimized and shielded through soft magnetism materials and metal materials, an excitation coil of a rotor of the alternating-current motor is supplied with power through the wireless transmission of the electric energy, mechanical connection between the rotor and external terminals is avoided, and brushless excitation of the motor is achieved.

Description

[0001] technical field [0002] The patent of the present invention relates to a brushless excitation mechanism based on wireless transmission of electric energy. [0003] Background technique [0004] The traditional brushless DC motor realizes the inverter function through the inverter composed of power electronic devices, that is, the commutator and brush are replaced by electronic commutation. Three-phase windings are arranged on the stator, and permanent magnet poles are arranged on the rotor. According to the change of the rotor position, the on-off of the corresponding devices in the inverter is controlled, so that the stator windings are energized in turns in a certain order, so that the rotor can rotate continuously under the drive of the electromagnetic torque. The brushless excitation of the synchronous motor uses an AC exciter with a rotating armature. The armature winding is arranged on the rotor, and the excitation winding is placed on the stator. When the ex...

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Problems solved by technology

However, for brushless DC motors, due to relying on sensors to judge the position, its control system has become more complex, and the requirements for the reliability of the control system are very high.

The excitation method of the rotary rectifier of the AC motor is composed of the AC exciter and its own stator excitation system, which has a complex structure and high cost

The magnetic core design and manufacturing process of the resolver, the winding method of the winding, etc. have a great influence on the excitation system. Since the secondary side works in a rotating state, a necessary gap is required to ensure its safety, and the efficiency of power transmission will be reduced. , and the existence of the transformer core also increases the weight and volume of the motor

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