High-reliability alternating-current motor control device applied to electric vehicles

Abstract

The invention discloses a high-reliability alternating-current motor control device applied to electric vehicles. The high-reliability alternating-current motor control device comprises a control module, a power inversing module, a power supply and an external communication module, wherein the control module comprises a first DSP chip and a second DSP chip; the second DSP chip and the first DSP chip are used for inquiring with each other by sending monitoring signals to each other; the power inversing module is used for supplying power to the alternating-current motor through the power supply; speed signals of the alternating-current motor are fed back to the control module; the power inversing module is used for respectively feeding temperature information, voltage information and current information of the alternating-current motor back to the control module; the control module is used for outputting PWM signals and charging and discharging signals to the power inversing module; the control module is used for communicating with an external part through the external communication module. According to the high-reliability alternating-current motor control device applied to the electric vehicles, two DSP chips are used as control cores; the two chips monitor each other; the halt of a system is avoided; the stability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of motor control, in particular to a high-reliability AC motor control device for electric vehicles. Background technique [0002] The three core components of an electric vehicle are: battery, motor and motor controller. The motor is the power source for electric vehicles, and the type of motor determines the structure and control strategy of the motor controller. Before the middle of the 20th century, the adjustable speed transmission system has been monopolized by DC motors. However, with the rapid development of power electronics technology, this pattern has been gradually broken. Due to the existence of brushes and commutators, the application of traditional DC motors has the following limitations: [0003] (1) There is a limitation on the maximum current of commutator and brush, which restricts the development of DC motor power; [0004] (2) Electric brushes need regular maintenance and frequent rep...

AI Technical Summary

Problems solved by technology

[0003] (1) There is a limitation on the maximum current of commutator and brush, which restricts the development of DC motor power;

[0004] (2) Electric brushes need regular maintenance and frequent replacement, which increases the cost of use. As labor costs increase year by year, this disadvantage will continue to worsen;

[0005] (3) When the DC motor is working, electric sparks will be generated due to the friction between the brush and the commutator, so it cannot be used in flammable and explosive occasions;

[0006] (4) Dust will aggravate the wear of the brush, so it is not suitable for DC motors in places with severe dust

However, the back EMF of the rotor of the motor cannot be measured. The usual method is to use the voltage applied to the rotor by the controller to approximately replace the back EMF of the rotor. In this way, problems such as large current, low efficiency, and large heat generation are generated when the motor is running at low speed.

[0009] Another disadvantage is that the controls are not very reliable

Because the motor and the control device generate a high current of up to thousands of amperes during operation, such a large current will generate strong electromagnetic waves, which will easily interfere with the normal operation of the control device, and even cause the main control chip to crash

The traditional method is to use the watchdog to reset the single-chip microcomputer, but due to the delay and the uncertainty of the system state during the reset process, the system may be burned or even crashed, which has potential safety hazards

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