A DC series excitation motor control system and method

Abstract

The invention provides a novel direct current series excited motor control system and method. The novel direct current series excited motor control system includes a DC power supply UDC, and includesa first branch circuit and a second branch circuit which are connected to the DC power supply UDC in series, wherein the first branch circuit includes a third branch circuit and a fourth branch circuit which are connected in parallel; the third branch circuit includes a first IGBT module and a second IGBT module which are connected in series; and the fourth branch circuit includes a third IGBT module and a fourth IGBT module which are connected in series. The novel direct current series excited motor control system can realize contactless smooth commutation of a direct current series excited motor through an electric power electronic device, can integrate commutation with motor modulation, can reduce the cost and heat dissipation of the system, and can improve the system efficiency.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a DC series excitation motor control system and method. Background technique [0002] DC series motor has the advantages of large starting torque, strong overload capacity, high speed, small size, light weight, etc., so it is widely used in various tools. However, since the DC series motor has brushes and commutators, it has disadvantages such as ring fire, low efficiency, poor protection ability, and low energy feedback efficiency during high-speed operation, which greatly restricts the use of DC motors. Especially in high-power systems, the commutation control of the motor is often realized by a high-current transfer switch or a contactor. In the high-speed working area of ​​the motor, it is also necessary to use a magnetic field weakening resistor and contactor control to improve the torque of the motor at high speed. Using resistance energy consumption braking when moving will c...

AI Technical Summary

Problems solved by technology

However, because the DC series motor has brushes and commutators, it has disadvantages such as ring fire, low efficiency, poor protection ability, and low energy feedback efficiency during high-speed operation, which greatly restricts the use of DC motors.

Especially in high-power systems, the commutation control of the motor is often realized by a high-current conversion switch or a contactor. In the high-speed working area of ​​the motor, it is also necessary to use a magnetic field weakening resistor and contactor control to improve the torque of the motor at high speed. Using resistance energy consumption braking when moving will cause a lot of energy loss

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