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Rotary machine control device and control method

A technology for rotating machinery and control devices, applied in motor control, torque ripple control, AC motor control, etc., can solve problems such as rapid torque fluctuations, and achieve the effect of avoiding damage and suppressing rapid fluctuations.

Pending Publication Date: 2021-06-11
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when the inverter is switched from the three-phase PWM control state to the three-phase short-circuit control state, there is a problem that the torque will fluctuate rapidly.

Method used

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  • Rotary machine control device and control method
  • Rotary machine control device and control method
  • Rotary machine control device and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0060] [1-1. Configuration of vehicle driving device]

[0061] First, refer to figure 1 as well as figure 2 , the configuration of the rotary machine control device 5 in this embodiment will be described.

[0062] figure 1 The electric vehicle 1 provided with the rotary machine control device 5 in this embodiment is shown as an example. The electric vehicle 1 includes drive wheels 2 , a power transmission mechanism 3 , a motor M1 , an inverter 10 , and a battery P1 . Among these configurations, the rotary machine control device 5 is composed of a motor M1, an inverter 10, and a battery P1.

[0063] The motor M1 is a three-phase AC permanent magnet synchronous motor that drives the drive wheels 2 of the electric vehicle 1 , and is, for example, an embedded magnet synchronous motor or a surface magnet synchronous motor. The motor M1 corresponds to a three-phase rotary machine.

[0064] The power transmission mechanism 3 is composed of, for example, a differential differen...

Embodiment approach 2

[0170] In this embodiment, a technique capable of suppressing load torque generation will be described for a rotary machine control device capable of suppressing the occurrence of sudden torque fluctuations and avoiding damage to elements of the inverter.

[0171] Regarding the configuration of the rotary machine control device 5 in the present embodiment, the description will be given mainly on the parts different from the rotary machine control device 5 in the first embodiment, and the same parts as the rotary machine control device 5 in the first embodiment will be given. Same number and description omitted.

[0172] The configuration of the rotary machine control device 5 according to the second embodiment is the same as that of the rotary machine control device 5 according to the first embodiment (see figure 2 ) are the same as shown in the circuit diagram.

[0173] The rotary machine control device 5 according to the second embodiment differs from the control circuit 2...

Deformed example 1

[0205] Modifications of the above-described embodiments will be described below.

[0206] Specifically, the example to be described in this modified example is to transfer from the third method to the Second mode (see Embodiment 2).

[0207] In this embodiment, as the control circuit 20 of the rotary machine control device 5, when shifting from the third mode to the second mode, the idea of ​​the control circuit 20 in the second embodiment can be adopted (see Figure 15 ).

[0208] First, similarly to Embodiment 1, the control circuit 20 performs control so as to perform transition in order of the first mode, the second mode, and the third mode.

[0209] Then, after the above transition, in the third mode, similar to the second embodiment, when it is determined that the rotational speed of the electric motor M1 obtained from the rotational speed calculation unit 55 is equal to or less than the predetermined rotational speed, the process transitions to the second mode. The t...

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Abstract

The present invention makes it possible to avoid damage to elements of an inverter while suppressing the occurrence of sudden fluctuations in torque. A rotary machine control device (5) is provided with an inverter (10), a rotational position sensor RS that detects the rotor position of an electric motor (M1), and a control circuit (20), the control circuit (20) being provided with: a first control unit that applies a voltage to the electric motor (M1) by means of the inverter (10) in order to cause the current or torque of the electric motor (M1) to follow a current command or a torque command; a second control unit that applies a voltage to the motor M1 by means of the inverter (10); and a switching unit that switches between the first control unit and the second control unit, the second control unit driving the inverter such that (i) the high-side switch and the low-side switch of the U-phase switching circuit are in a non-conductive state throughout the first period of the U-phase, and (i) the high-side switch and the low-side switch of the U-phase switching circuit are in a non-conductive state throughout the second period of the U-phase. And (ii) either the high-side switch or the low-side switch of the U-phase switching circuit is turned on during a part of or the entire second period of the U-phase.

Description

technical field [0001] The invention relates to a rotary machine control device and a control method. Background technique [0002] Due to fuel consumption restrictions or CO2 restrictions, such as EV (Electric Vehicle: Electric Vehicle), HEV (Hybrid Electric Vehicle: Hybrid Electric Vehicle), PHV (Plug-in Hybrid Vehicle: Plug-in Hybrid Electric Vehicle), FCV (Fuel Cell Vehicle: The electrification of vehicles such as fuel cell vehicles is progressing. Furthermore, in order to improve the electrical efficiency of the vehicle, a permanent magnet synchronous motor is often used as a motor for driving the vehicle. [0003] The permanent magnet synchronous motor has high efficiency because it does not require excitation current, but the induced voltage generated by the magnetic field flux of the permanent magnet increases in proportion to the rotational speed (also referred to as rotational speed or angular velocity in the following description), and when it becomes a constant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02P29/024H02P29/032H02P6/10H02P25/026
CPCH02P27/08H02P29/024H02P29/0241H02P29/032H02P6/10H02P25/026H02P2207/05Y02T10/72
Inventor 松山哲也前田好彦
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD