A Brushless DC Motor Regenerative Braking System Using Single Current Sensor
A technology of brush DC motor and regenerative braking, which is applied in the direction of electronically commutated motor control, control system, electrical components, etc., can solve the problems of recycling braking energy, reducing feedback current, and not being able to directly and effectively control, and achieve low cost , taking into account the energy feedback effect and the effect of improving safety
Inactive Publication Date: 2017-12-15
BEIJING UNIV OF TECH
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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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[0022] Such as Figure 1-3 As shown, a brushless DC motor regenerative braking system using a single current sensor, the system includes an RC low-pass filter 1, a DC bus current regulator 2, a DC bus overvoltage protection module 3, and an armature current regulator 4 , a PWM modulator 5, a bus current sensor 6, a permanent magnet brushless DC motor 7, a storage battery 8, a bus capacitor 9, and a three-phase full-bridge inverter 10.
[0023] The three-phase windings of the permanent magnet brushless DC motor 7 are connected to the three half-bridge arms of the three-phase full-bridge inverter 10; The bus current sensor 6 is placed on the positive bus or the negative bus to detect the bus current flowing through the three-phase full-bridge inverter 10; the input of the DC bus overvoltage protection module 3 is the bus voltage signal U DC , which is output to the DC bus current regulator 4; the PWM signal output by the PWM modulator 5 is sent to the three-phase full-bridge in...
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A brushless DC motor regenerative braking system using a single current sensor. Since the electric vehicle will brake frequently when driving on the actual road, the regenerative braking method can effectively save this part of energy. However, usually The battery has a limit on the maximum charging current. Traditional braking energy recovery generally adopts simple open-loop control, single voltage closed-loop control or motor phase current closed-loop control, which cannot recover the maximum possible braking energy. The main technical problem to be solved by the present invention is to convert as much vehicle kinetic energy as possible into electric energy and send it back to the battery by means of braking energy feedback, adopting double-closed-loop control of the motor armature current and the feedback battery current, so as to maximize the improvement of electric power. The cruising range of the vehicle.
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 with traffic congestion and increasing number of vehicles, fossil fuel-based transportation such as automobiles and motorcycles is facing the problem of global oil resource shortage and environmental pollution. Vehicles that rely on fossil fuels usually use internal combustion engines as engines to provide power for vehicles , but the working efficiency of the internal combustion engine is very low, and the fuel is non-renewable, which also causes the status quo of energy waste of traditional vehicles. [0003] Electric vehicles, such as electric cars, electric motorcycles, electric bicycles, etc., use more efficient electric motors as power output. Among them, the permanent magnet brushless DC motor is widely used in light electric veh...
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IPC IPC(8): H02P6/00H02P6/24
Inventor 许家群崔昊天
Owner BEIJING UNIV OF TECH