Permanent magnet synchronous motor starting method for mileage increasing system provided with hall position sensor

Abstract

The invention discloses a permanent magnet synchronous motor starting method for a mileage increasing system provided with a hall position sensor, which belongs to the field of motor control. Due to three ways of digital signals outputted by a three-way switch hall sensor through filtering, six accurate rotor position signals can be determined, 360-DEG electric angle space is uniformly divided into six hall intervals, the maximum value of an average electromagnetic torque is solved through a trigonometric function extremum seeking method, a corresponding optimal angle phi<*> in each hall interval is acquired, the corresponding optimal angle phi<*> serves as an angle signal modulated by a space vector to be inputted, the output PWM signal modulated by the space vector controls a three-phase inverter bridge to generate a stator current vector IS, an electromagnetic torque is generated in a stator winding of the permanent magnet synchronous motor, the permanent magnet synchronous motor is dragged to start, an internal combustion engine is further dragged to start, the mileage increasing system permanent magnet synchronous motor starting function is realized, the maximum electromagnetic torque output is ensured, real-time estimation does not need to be carried out on a rotor position, the algorithm is simple and effective, and the space and the cost are saved.

Description

technical field [0001] The invention relates to a starting method of a permanent magnet synchronous motor for a range-extending system using a Hall position sensor, especially used when starting an internal combustion engine in the range-extending system, and belongs to the field of motor control. Background technique [0002] Extended-range electric vehicles can adapt to the needs of long and short driving distances, require a small battery capacity, and do not require deep discharge. Compared with other new energy vehicles, they have certain advantages. The extended-range electric vehicle is also named because the vehicle is equipped with a range-extended system. The purpose of the extended-range system is to further increase the cruising range of pure electric vehicles, reduce the number of deep discharges of the battery, and improve the life of the battery. [0003] During the starting process of the range-extending system, the starter motor is required to quickly drag t...

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Problems solved by technology

At present, there are many solutions for starting the permanent magnet synchronous motor, but there are certain problems, such as: the starting method of the permanent magnet synchronous motor described in CN102361430A realizes sensorless starting by injecting high-frequency voltage signals into the three-phase stator windings of the motor , but this method is limited to the case of built-in permanent magnet synchronous motors where the equivalent inductance of the motor's AC and D axis is not equal, and at zero or low speed, the electrical signal is very small, and it is impossible to accurately estimate the rotation position of the rotor. Poor; the permanent magnet synchronous motor starting method described in CN101764553A calculates the angular velocity of the rotor by switching the Hall position sensor, and estimates the motor rotor position in conjunction with the controller sampling period and sampling times to realize the motor starting, but because the internal combustion engine speed of the range-extending system fluctuates violently, Its angular velocity is difficult to estimate accurately, which leads to low precision of rotor position and easy system instability when starting

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