Brushless direct-current motor regenerative braking system adopting single-current sensor

Abstract

The invention provides a brushless direct-current motor regenerative braking system adopting a single-current sensor. Part of energy can be effectively saved in the regenerative braking manner under the condition that electric vehicles are braked frequently when driven on actual roads, however, the maximum charging current of a storage battery is usually limited, traditional braking energy is usually recovered in a simple open-loop control manner, a single voltage closed-loop control manner or a motor phase current closed-loop control manner, and the braking energy cannot be recovered as much as possible. The system solves a technical problem and converts kinetic energy of a vehicle into electric energy as much as possible through motor armature current and returned storage battery current double closed loop control in a braking energy regeneration manner to return the electric energy to the storage battery, and the driving mileage of the electric vehicle is increased to the largest extent.

Description

Technical field [0001] The invention relates to the technical field of motor control, in particular to a brushless DC motor feedback braking system using a single current sensor. Background technique [0002] In large and medium-sized cities where traffic is congested and vehicles are increasing day by day, fossil fuel-based transportation such as automobiles and motorcycles is facing the global shortage of oil resources and environmental pollution. Vehicles relying on fossil fuels usually use internal combustion engines as engines to provide power to the vehicles. , But the internal combustion engine has very low working efficiency and the fuel is not renewable, which also causes the current status of waste of energy in traditional vehicles. [0003] Electric vehicles, such as electric cars, electric motorcycles, and electric bicycles, use more efficient electric motors as power output. Among them, permanent magnet brushless DC motors are widely used in light electric vehicles be...

AI Technical Summary

Problems solved by technology

However, the existing braking energy recovery methods mostly use relatively simple open-loop control, single voltage closed-loop control or motor phase current closed-loop control, as described in patents 201210435990.2 and 201420254918.4, but these methods cannot maximize the recovery of braking energy

The main reason is that the battery has a limit on the maximum allowable charging current, and the above method cannot directly and effectively control the current fed back to the battery; in order to avoid damage to the battery and prolong the life of the battery, the above method has to reduce the feedback current, resulting in the inability to maximize the feedback to the battery energy of

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