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Rotary electric machine control device

A technology for control devices and rotating electrical machines, applied in the direction of AC motor control, control system, multiple motor speed/torque control, etc., can solve the problems of current ripple deterioration, control instability, and increased switching loss, etc., to reduce noise Effect

Pending Publication Date: 2021-10-22
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Rotating electric machine control devices based on PWM control have the following problems: when the carrier frequency becomes higher, the switching loss caused by PWM control increases, and when the carrier frequency becomes lower, the current ripple deteriorates and the control becomes unstable

Method used

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  • Rotary electric machine control device
  • Rotary electric machine control device
  • Rotary electric machine control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0030] An inverter and a rotating electrical machine according to Embodiment 1 will be described with reference to the drawings. figure 1 It is a configuration diagram of a rotating electrical machine control device including a plurality of inverters and a plurality of rotating electrical machines driven by it according to the present embodiment. In the following description of the embodiment, an example will be given where two inverters and two rotating electric machines driven by them are used as an example.

[0031] For example, the first rotating electrical machine 1a is a permanent magnet type synchronous rotating electrical machine in which the stator has multi-phase (in this example, three-phase) windings and the rotor has permanent magnets, and the second rotating electrical machine 1b is a stator with multi-phase (in this example, three-phase) windings. Phase) winding, rotor permanent magnet type synchronous rotating machine with permanent magnets.

[0032] The rotat...

Embodiment approach 2

[0059] In Embodiment 2, the setting of the PWM mode considering the noise reduction of the entire system (for example, the entire vehicle installed) will be described. figure 1 The rotary electric machine control device 100 including the illustrated plurality of first and second inverters 20a, 20b, and the first and second rotary electric machines 1a, 1b driven by it.

[0060] When the PWM mode is set, a frequency region for avoiding noise is set for each of the first and second inverters 20a, 20b, respectively. As equipped with figure 1 The entire system of the structure, the carrier frequency region where noise is avoided can be determined from the frequency region where noise tends to increase, etc. If the first inverter 20a and the second inverter 20b operate in the PWM mode with the same carrier frequency in the frequency region where noise is to be avoided as a whole system, the switching noise of PWM will overlap, and the noise of the whole system may be further growt...

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PUM

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Abstract

When a plurality of PWM-controlled inverters are operated in parallel, if a carrier frequency region is limited in each inverter in view of noise reduction, there is a problem that the switching loss of a motor using a higher carrier frequency is always deteriorating, and the current ripple of a motor using a lower carrier frequency is always deteriorating. This rotary electric machine control device has a combination pattern in which two or more PWM patterns are combined in accordance with the region of the input / output state, with the relationship between the input / output state of an inverter and the carrier frequency being one PWM pattern, and a PWM mode determination unit that switches the PWM modes in accordance with the combination modes that differ in each of the inverters.

Description

technical field [0001] This application relates to rotating electrical machine controls. Background technique [0002] When a plurality of inverters are operated in parallel, the PWM pattern, which is the relationship between the input and output states of the inverters and the carrier frequency, is generally set to be common among the plurality of inverters. However, if the operating carrier frequency of a plurality of inverters is the same, the noise generated by the switching of the inverter elements overlaps, and there is a problem that the noise becomes larger. [0003] As a countermeasure against the above problems, for example, a technique such as Patent Document 1 below is known. Patent Document 1 discloses a case in which carrier frequencies having a specific bandwidth are set so that a plurality of inverters do not overlap each other, thereby reducing noise generated by switching of inverter elements. . [0004] prior art literature [0005] patent documents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/04H02P27/08
CPCH02P6/04H02P27/085
Inventor 佐藤大介金原义彦中野晃太郎松浦大树
Owner MITSUBISHI ELECTRIC CORP