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Method and device for controlling a polyphase electrical machine

A multi-phase motor and control circuit technology, applied in the direction of output power conversion device, control system, motor control, etc., can solve the problem of increasing volume

Active Publication Date: 2012-11-07
LABINAL POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the above two arrangements, regardless of the conversion performance of the power switch or the number of inverters, it will inevitably involve increasing the volume

Method used

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  • Method and device for controlling a polyphase electrical machine
  • Method and device for controlling a polyphase electrical machine
  • Method and device for controlling a polyphase electrical machine

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Embodiment Construction

[0037] image 3 An embodiment of the control device of the present invention is shown, the control device shown is through two three-phase inverters 10 connected in parallel 1 and 10 2 To control the three-phase motor 30.

[0038] As mentioned above, the invention is particularly applicable in the field of aviation. Electric machine 30 may be a system for starting an aircraft engine (eg, a turbine engine). An electric motor is mechanically coupled to the shaft of the engine to drive the engine at start-up, for which purpose the electric motor is controlled by means of an electric motor. The electric machine 30 may also be a machine used to start an auxiliary power unit (APU) or to start an actuator.

[0039] Inverter 10 1 with three branches 10 1a , 10 1b and 10 1c , respectively through the control device output 12 a , 12 b and 12 c Deliver AC I 1a , I 1b , and I 1c . Similarly, the inverter 10 2 with three branches 10 2a , 10 2b and 10 2c , also respectivel...

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Abstract

The invention relates to a polyphase electrical machine (30), which is controlled by means of at least two inverters in parallel (101, 102), wherein each inverter has branches (101a, 101b, 101c, 102a, 102b, 102c), in a number equal to the number of phases of the machine, and is controlled by pulse width modulation (PWM). In response to the detection of a defective inverter branch (102a), the latter is isolated, and the phase in question is supplied with power by the or each other corresponding inverter branch (101a). The control by PWM is modified so as to make the power switches of said or each other branch (101a) consecutively conductive without switching when, in absolute value form, the strength of the current for the phase in question (1a) is greater than or equal to a threshold between 80% and 120% of (n-1) Imax / n, where n is the number of inverters and Imax is the maximum strength of the phase current. It is thus possible to maintain generation of substantially sine wave voltage over each phase while preventing overrated voltage in the power switches so that, in the event of a defect, said switches can switch currents with higher amplitudes than during normal operation.

Description

technical field [0001] The invention relates to the control of multi-phase motors by means of multiple parallel-connected inverters. [0002] The invention is particularly suitable for use in environments where such control must have a high degree of reliability, for example in the field of aviation. Background technique [0003] Figure 1 shows a known three-phase motor control device. This arrangement has two three-phase inverters 1, each supplying alternating current to the phase windings of the motor 4, each inverter supplying about half the current of each phase. Each inverter has switches 5, eg power transistors, in the bridge circuit. Each inverter has three branches 6, each branch comprising two power switches 5 connected in series between two opposite terminals +V and -V of the direct current (DC) power supply, and the switches connected to the Opposite sides, while point 7 is connected to each phase of the motor. A three-pole isolating switch 8 is connected betw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/493H02P29/02
CPCH02M7/493H02P29/022H02P29/032
Inventor 艾瑞克·德沃吉夫斯
Owner LABINAL POWER SYST
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