Frequency multiplication chopping control circuit for double-winding high-speed brushless DC motor and winding switching control method

Abstract

The invention relates to a frequency multiplication chopping control circuit for a double-winding high-speed brushless DC motor and a winding switching control method. Power electronic devices achieve series-parallel conversion on motor winding topological structure in order that motor windings are connected in series to provide a driving system with a large start torque in a start-up phase and the motor windings are connected in parallel to provide with the driving system with a large rotating speed range after being started. The winding switching control method requires minimum switching tubes in the current switching technologies such that the size and the weight of a system are decreased. The winding switching control method has beneficial effects 1 that the power electronic devices switch the motor windings; 2 that winding series-parallel switching is achieved by a circuit formed by two independent inversion circuits and two independent windings in star connection, and three switching tubes added outside the inversion circuit; and 3 that in all current switching technologies, after switching is achieved, a winding is disconnected or discharges via a rectifier and a discharging loop and winding parallel connection is not achieved such that energy is wasted.

Description

technical field [0001] The invention belongs to the technical field of motors, and specifically relates to a double-winding high-speed brushless DC motor frequency multiplication chopper control circuit and a winding switching control method. By switching the topology structure of the series-parallel connection of the windings of the three-phase AC motor, the motor is connected in series during the starting phase. To obtain a larger starting torque, after the start is completed, it can be converted to parallel connection to obtain a larger speed range. It can be widely used in driving motors and servo motors. Background technique [0002] Electric vehicles, machine tool spindles, servo devices, etc. usually require the drive system to provide high torque at low speeds, and have a wide speed range and system efficiency at high speeds. In order to achieve this goal, in addition to the method of field weakening control, the method of winding switching can also be used. Without...

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Problems solved by technology

[0005] The patent announcement number is CN2822007 "Brushless permanent magnet DC motor stator winding suitable for multi-speed adjustment". The speed ratio is only 1:1.2-1.6; and because there are two sets of star and delta windings, the off-line process is complicated. At the same time, the connection of the delta windings causes circulating currents in the permanent magnet motor windings, resulting in additional losses

Adding an inverter circuit will increase the volume, weight and loss of the system, and a set of windings will be disconnected when switching, wasting energy

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