An excitation device of an electric excitation motor and its parameter acquisition method

Abstract

The invention discloses an electrical excitation motor excitation device and parameter obtaining method thereof. The electrical excitation motor excitation device includes an excitation winding, an excitation winding buck circuit, an isolation type DC / DC converter, a three-phase winding and a bus power supply; the bus power supply is connected with the three-phase winding and is used for providinga bus voltage for the three-phase winding; the input end of the isolation type DC / DC converter is connected with the bus power supply, the output end is connected with the input end of the excitationwinding buck circuit, and the isolation type DC / DC converter is used for performing isolation ratio transformation on the bus voltage provided by the bus power supply to serve as an input voltage ofthe excitation winding buck circuit; and the output end of the excitation winding buck circuit is connected with the excitation winding, the buck circuit is used for performing chopping on the bus voltage after isolation ratio transformation, and a voltage obtained after chopping serves as a terminal voltage of the excitation winding. The electrical excitation motor excitation device provided by the invention eliminates a common-mode access between an excitation loop and a three-phase loop, suppresses common-mode current, and considers optimization of a power device duty ratio, thereby achieving better power device control performance.

Description

Technical field [0001] The invention belongs to the field of electromechanical technology, and more specifically, relates to an electric excitation motor excitation device and a parameter acquisition method thereof. Background technique [0002] At present, electrically excited motors are widely used in the fields of high power density and high reliability, and have broad application prospects in wind farms, electric vehicles, ship propulsion, aerospace and other fields. Generally, permanent magnet motors have hidden dangers of loss of magnetism, and the cost of magnet steel is high, and the field weakening control is complicated. Compared with permanent magnet motors, electrically excited motors have one more degree of freedom for the excitation current, which makes the control of electrically excited motors more flexible. Due to the use of electric excitation, there is no possible loss of magnetism in permanent magnet motors, and it is more suitable for applications with stric...

AI Technical Summary

Problems solved by technology

The common electric excitation motor adopts a topology structure in which the three-phase winding and the excitation winding share a DC power supply, and there is a loop of common-mode current flow between the excitation winding and the three-phase winding. This common-mode current may cause damage to the winding insulation and vibration of the bearing damage, the suppression of this common mode current must be considered in the design and manufacture of the motor control system

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