Method and apparatus for controlling induction motor of train
A technology of induction motor and control method, which is applied in the direction of AC motor control, AC induction motor traction, DC motor speed/torque control, etc., which can solve the problems of induction motor overheating and overcurrent, so as to prevent overheating and improve safety Effect
Active Publication Date: 2015-03-18
HITACHI LTD
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Problems solved by technology
[0010] However, in the multi-induction motor electric train as described above, there is a problem that an overcurrent occurs in some of the plurality of induction motors receiving power from the same power converter.
In addition, when an overcurrent occurs in an induction motor, especially in an electric vehicle such as a high-speed vehicle in which the induction motor is driven for a long time in a high-speed range, overheating of the induction motor caused by such an overcurrent is a safety problem.
Method used
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[0022] One embodiment of the present invention will be described in detail below using the drawings.
[0023] (1) Relationship between slip frequency, current and torque in induction motor
[0024] In the case where the wheel diameters of the wheels driven by the plurality of induction motors receiving power from the power converter are different, the output frequency of the power converter is the same for each induction motor. Since the wheel diameters differ from each other, the slip frequency also differs from one induction motor to another. In addition, the rotational frequency difference between the induction motors due to the wheel diameter difference increases as the speed of the multi-induction motor train increases.
[0025] Generally, in multi-induction motor trams, there is a relationship between the slip frequency of the induction motor, the current supplied to the induction motor, and the torque generated by the induction motor. figure 1 relationship as shown. ...
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An induction motor type electric train and a control method for the same are proposed in which overcurrent to induction motors is restrained and therefore overheat of the induction motors due to overcurrent can be prevented effectively. An induction motor current command value that is a target value of output current of a power converter is generated. The power converter is controlled in such a way that the output current of the power converter follows the induction motor current command value, while a magnitude of the induction motor current command value is limited in such a way that overcurrent to the induction motors due to a wheel diameter difference between respective wheels driven by the respective induction motors is restrained, based on a rotational frequency of each induction motor.
Description
technical field [0001] The present invention relates to an induction motor train and a control method thereof, and is particularly suitable for use in an induction motor train having a structure in which power is supplied from one power converter to a plurality of induction motors (hereinafter referred to as a multi-induction motor train) . Background technique [0002] The multi-induction motor type electric car is equipped with: one or more power converters that convert the power obtained from the overhead line through the pantograph into three-phase AC power of variable voltage and variable frequency; Multiple induction motors are driven by three-phase AC power supplied from an inverter, and the multiple induction motor tram runs based on the power obtained by driving these multiple induction motors. [0003] The output frequency of a power converter mounted on such a multi-induction motor train is generally set by adding or subtracting a slip frequency to a rotor freque...
Claims
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IPC IPC(8): H02P5/74H02P27/04B60L15/20B60L9/18H02M7/48H02P5/46
CPCB60T2240/07B60T8/1705H02P7/2805B60L7/14B60L9/04B60L15/025B60L15/2009B60L2200/26B60L2220/12B60L2220/42B60L2240/12B60L2240/421B60L2240/423B60L2240/429B60L2240/46B60L2240/529B60L2260/44Y02T10/64Y02T10/72
Inventor 德岛匠佐川哲大河原洋
Owner HITACHI LTD