A direct torque control method for a two-phase permanent magnet synchronous motor fault-tolerant system
A permanent magnet synchronous motor and direct torque control technology, applied in the field of power electronics, can solve problems such as open circuit faults, restricting the application and promotion of two-phase motors, short circuit of power switches, etc., to achieve strong versatility, improve system control performance and response speed Effect
Active Publication Date: 2020-07-28
WEIHAI CREDITFAN VENTILATOR
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Problems solved by technology
However, in the eight-switch inverter two-phase permanent magnet synchronous drive, the power switch failure rate of the inverter is high
In the occasions with frequent use, the system will often have power switch short-circuit or open-circuit faults, which restricts the application and promotion of two-phase motors
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[0050] In the description of the present invention, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.
[0051] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the i...
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The invention discloses a direct torque control method for a two-phase permanent magnet synchronous motor fault-tolerant system. The direct torque control method comprises the following steps: using reference rotate speed and calculation rotate speed to obtain rotate speed deviation so as to generate a reference torque signal through a rotate speed regulator, then calculating torque and flux linkage calculated by a torque and flux linkage calculation unit, calculated reference torque and a given reference flux linkage signal to obtain torque and flux linkage deviation, using the torque and flux linkage deviation to obtain toque regulating quantity and flux linkage regulating quantity through a hysteresis regulator respectively, then using a fault diagnosis module to determine the fault cause of the two-phase permanent magnet synchronous motor fault-tolerant system to obtain fault signals, feeding the toque regulating quantity and flux linkage regulating quantity into a fault-tolerant control module together with a flux linkage vector section number, determining different fault conditions according to the fault signals, and selecting different switch vector tables to determine a final inverter switch control signal so as to realize direct torque control for the two-phase permanent magnet synchronous motor fault-tolerant system. According to the direct torque control method, thereliability and safety of the two-phase permanent magnet synchronous motor fault-tolerant system can be strengthened effectively.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a direct torque control method for a fault-tolerant system of a two-phase permanent magnet synchronous motor. Background technique [0002] The stator of the two-phase permanent magnet synchronous motor generally uses two windings, and the two-phase windings are usually placed separately according to 90 electrical angles. The two-phase permanent magnet synchronous drive is usually driven by two-phase sine wave voltage with a phase difference of 90 degrees. The driving method is relatively simple and effectively reduces the cost of driving hardware. For low-cost applications, since there is no special two-phase power supply, single-phase power is generally used. The phase difference is formed by connecting capacitors in one phase to generate starting torque. Now it is more commonly used in refrigerators, air conditioners, and washing machines. This motor. ...
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IPC IPC(8): H02P21/30
CPCH02P21/30
Inventor 林海肖家博陈俊硕周熙炜陈金平司利云巩建英龚贤武
Owner WEIHAI CREDITFAN VENTILATOR