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Overmodulation method and system of motor controller

A motor controller and overmodulation technology, which is applied in control systems, AC motor control, general control strategies, etc., can solve the problems of increasing the iron loss of the motor, and achieve the effect of improving efficiency and increasing cruising range

Pending Publication Date: 2021-11-26
LEADRIVE TECH (SHANGHAI) CO LTD
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Problems solved by technology

[0003] But in the over-modulation area, since the output voltage of the inverter contains low-order harmonics, this increases the iron loss of the motor

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  • Overmodulation method and system of motor controller
  • Overmodulation method and system of motor controller

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Embodiment Construction

[0040] The advantages of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0041] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

[0042] The terminology used in the present disclosure is for the purpose of describing particular embodiments only, and is not intended to limit the present disclosure. As used in this disclosure and the appended claims, the singular...

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Abstract

The invention provides an overmodulation method and system of a motor controller. The overmodulation method comprises the following steps: acquiring a torque-rotating speed relation schematic diagram of the motor controller; based on a power assembly system composed of a motor controller and a motor, calibrating a first efficiency map of the power assembly system during normal operation and a second efficiency map of the power assembly system during over-modulation operation within a full rotation speed range off line in an experimental environment; comparing the first efficiency atlas with the second efficiency atlas by taking the rotating speed of the motor as a horizontal axis, and selecting an operation state with higher efficiency in the first efficiency atlas and the second efficiency atlas under each rotating speed; fitting a torque-rotating speed relation schematic diagram of the power assembly system based on the selected operation state; and based on a torque-rotating speed relation schematic diagram of a power assembly system, performing overmodulation on a motor in a use environment. After the technical scheme is adopted, the efficiency of a power assembly system can be improved, and the endurance mileage of the electric automobile applying the motor controller is increased.

Description

technical field [0001] The invention relates to the field of motor control, in particular to an overmodulation method and system for a motor controller. Background technique [0002] In new energy vehicle-mounted drives or other inverters, overmodulation schemes are often used to improve the DC bus voltage utilization of the motor controller, expand the operating range in high-speed areas, and reduce the current, which improves the efficiency of the motor controller. [0003] But in the overmodulation region, since the output voltage of the inverter contains low harmonics, this increases the iron loss of the motor. It can be seen that the overmodulation algorithm reduces the copper loss of the motor and increases the iron loss, and the impact on the motor loss depends on the actual situation. In the actual powertrain system, the overall performance of the system is affected by the inverter and the motor. Therefore, when selecting the modulation operation strategy of the con...

Claims

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Application Information

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IPC IPC(8): H02P23/00B60L15/20
CPCH02P23/0004B60L15/20Y02T10/72Y02T10/64
Inventor 沈捷李一粟
Owner LEADRIVE TECH (SHANGHAI) CO LTD
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