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Operating electrical machines from a DC link

A tie-line, switched reluctance motor technology, applied in the control of multiple DC motors, AC motor control, DC circuits can reduce harmonics/ripples, etc., can solve problems such as damage, parasitic oscillations, drive shutdown, etc.

Inactive Publication Date: 2012-11-07
NIDEC SR DRIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This would give rise to the possibility of parasitic oscillations on the dc link, which could have damaging effects in itself and cause the drive to shut down

Method used

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  • Operating electrical machines from a DC link
  • Operating electrical machines from a DC link
  • Operating electrical machines from a DC link

Examples

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Embodiment Construction

[0050] [0050] The following examples illustrate the reference design as Figure 7 A system with a three-phase machine is shown. However, according to the invention, machines with any number of phases may be used, and the generator and engine(s) need not have the same number of phases. Control of the respective machines 72 and 78 is implemented by software loaded into the memory 81 of the controllers 75 and 79 . According to their respective control algorithms, the power converter switches are activated. In this embodiment, the technology is implemented in software. Figure 7 Also shown is a monitoring device 83 which is arranged to monitor the dc link voltage. This is used for general system monitoring purposes, but is also used with respect to the embodiments disclosed herein. The monitoring equipment can have many different forms, which are well known to those skilled in the art, and will not be described in detail here.

[0051] [0051] Figure 9 shows the Figure 7 The op...

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Abstract

A drive system has a number of electrical machines. One machine operates as a generator supplying an output to a DC link, which in turn supplies one or more machines operating as motors to drive loads. The motors are supplied through power converters. The total capacitance of the DC link is minimised and the link kept in a stable condition by preventing it falling to a hazardous level. One embodiment prevents the phase currents adding in such a manner as to reduce the DC link voltage. Another embodiment employs freewheeling in the phase currents to prevent the DC link voltage falling below a predetermined threshold.

Description

technical field [0001] [0001] The present invention generally relates to systems and methods for operating multiple electric machines from a DC link. More particularly, but not exclusively, the invention relates to the stability of such DC link lines on which electrical switching machines are required to co-operate. Background technique [0002] [0002] An example of such a switching machine is a switched reluctance motor. A general treatment of electric drives involving switched reluctance machines can be found in various textbooks such as "Electronic Control of Switched Reluctance Machines, Newnes, 2001" by TJE Miller, which is incorporated herein by reference. More details are found in the paper "The characteristics, design and application of switched reluctance motors and drives, PCIM'93, Nümberg, 21-24 June 1993" by Stephenson and Blake, which is incorporated herein by reference. [0003] [0003] FIG. 1 of the accompanying drawings shows in a schematic manner a typical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J1/02H02P5/00
CPCH02P25/085H02M5/44H02P29/026H02P29/0038H02M2001/008H02P5/68H02P25/092H02P29/50H02M1/008
Inventor N·N·富尔顿P·R·马乙斯
Owner NIDEC SR DRIVES