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A dual-motor three-leg inverter and its control method

A control method and inverter technology, applied in motor control, motor generator control, AC motor control, etc., can solve the problem of high hardware cost, achieve rapid torque response, simple control structure, and no overshoot in torque response Effect

Active Publication Date: 2021-08-13
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the system with this structure has better control performance, the hardware cost of the system is relatively high.

Method used

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  • A dual-motor three-leg inverter and its control method
  • A dual-motor three-leg inverter and its control method
  • A dual-motor three-leg inverter and its control method

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Embodiment Construction

[0050] The present invention is described in further detail below in conjunction with accompanying drawing:

[0051] Such as Figure 1 to Figure 3 As shown, a dual-motor three-leg inverter includes a controller, a three-phase motor M1, a three-phase motor M2 and a three-leg inverter;

[0052] The three-leg inverter includes three parallel inverter bridge arms, the inverter bridge arms are connected to the same DC power supply, and each inverter bridge arm includes three series-connected power switch tubes, each inverter The midpoint between two adjacent power switch tubes on the bridge arm is the midpoint, the three windings of the three-phase motor M1 are respectively connected to the midpoints on the same side of the three inverter bridge arms, and the three windings of the three-phase motor M2 are respectively connected to At the midpoint of the other of the three inverter bridge arms;

[0053] The controller includes a current sensor, a voltage sensor and a speed regulat...

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Abstract

The invention discloses a control method for a dual-motor three-bridge-arm inverter. The direct torque method is used to obtain two groups of switch states, and the torque control signal, the flux linkage control signal and the three-phase motor M1 and the three-phase motor M2 are used to obtain the control method. The rotor position signal selects the switch trigger signal of the voltage vector selection switch, according to which the on-off state of the bridge arm switch in different directions can be obtained, and the voltage vector table of the three-phase permanent magnet synchronous motor is obtained by using direct torque control, and by selecting its bridge arm The switching state of the two three-phase permanent magnet synchronous motors is controlled, and the selection switch can be controlled independently, so that the time-sharing operation of the two three-phase permanent magnet synchronous motors is realized. The control of the method is simple and clear. The invention has the advantages of simple algorithm, fast response and high precision. At the same time, the present invention proposes a control scheme based on a nine-switch three-leg inverter, which can further reduce the hardware cost of the system and facilitate the rapid popularization and application of the technology of the present invention.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a dual-motor three-leg inverter and a control method thereof. Background technique [0002] The dual-motor system can eliminate the transmission gap and share the load by controlling the output torque of the two motors. In recent years, with the higher demands of social life and industrial production, dual-motor control systems are widely used in papermaking, transportation, electric vehicles, washing machines, air conditioners and other home appliances. The multi-phase motor drive system has the characteristics of low voltage, high power output, high power density, small torque fluctuation, suitable for fault-tolerant operation, etc., and has received extensive attention. In a dual-motor drive system, the need to control both motors at the same time presents a higher level of complexity for developers not only to deal with, but also to ensure safe operation under any circ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/04H02P21/28H02P21/14H02P21/20H02P27/08H02M7/5387
CPCH02M7/5387H02P6/04H02P21/141H02P27/08H02P2203/09H02P21/20H02P21/28
Inventor 林海陈俊硕周熙炜陈金平巩建英龚贤武司利云李耀华
Owner CHANGAN UNIV
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