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Permanent magnet-excited electric machine

A technology of current and current components, applied in the direction of motor, motor control, control generator, etc.

Inactive Publication Date: 2016-03-02
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the rotor temperature or the field strength of the permanent magnets can only be measured with high technical effort

Method used

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  • Permanent magnet-excited electric machine
  • Permanent magnet-excited electric machine
  • Permanent magnet-excited electric machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] figure 1 An output stage / inverter / frequency converter for driving a permanent magnet synchronous motor is shown. The frequency converter has three half-bridges / power paths, each with a high-side power switch 4 and a low-side power switch 7 . The phase conductors of the electric machine 8 are arranged at the nodes of the half bridge. Diodes / body diodes 5 , 6 are arranged / structured on power switches 4 , 7 .

[0035] figure 2 Two curves are shown for different operating states of the permanent magnet synchronous machine. What braking torque is generated in short-circuit mode is shown in a first curve 31 . It can be seen here that a high braking torque is produced at low rotational speeds. A maximum value 11 can be determined at which the torque which is highest in absolute terms is produced. At high rotational speeds, only low torques are generated in short-circuit mode. In contrast, only low torques are generated at low rotational speeds in freewheeling mode (see...

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PUM

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Abstract

The invention relates to a method for actuating a multiphase frequency converter for actuating an electric machine 8, said electric machine 8 being suitable as a traction drive of a vehicle. The frequency converter comprises power switch pairs, each of which comprises a first power switch 4 and a second power switch 7 that are connected in series. The first power switch 4 is connected to a DC voltage UBAT, and the second power switch 7 is connected to a reference potential GND of the DC voltage UBAT, each node between the first power switch 4 and the second power switch 7 being connected to the respective phase conductor of the electric machine 8. The method has the following steps: ascertaining the presence of a fault 17; and in the event of a fault and an inactive control signal at the first and / or second power switch, determining whether the frequency converter should be switched into the short-circuit mode or the freewheeling mode using the phase conductor currents iU, iV, iW and / or using the position of the rotor of the electric machine 8.

Description

technical field [0001] The invention relates to a method for controlling a multiphase frequency converter for driving an electric motor, a control unit and a vehicle. Background technique [0002] Permanent-magnet-excited synchronous electric machines for driving vehicles are known from the prior art. [0003] Permanent-magnet-excited motors used as traction drives for electric or hybrid vehicles generally cannot be disengaged mechanically from drive shafts and wheels. A characteristic of a permanently excited electric machine is that it produces a voltage proportional to the rotational speed of the electric machine. If this voltage rises above the current intermediate circuit voltage and the conduction voltage of the diode of the power switch (or the body diode of the field effect transistor) rises, feedback occurs. There is a danger through regenerative feedback that the DC voltage source is damaged by overloading or the frequency converter is overcurrented. Furthermore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/032H02P3/14H02P21/36B60L3/00B60L3/04B60L7/14B60L15/20
CPCB60L3/0061B60L3/0076B60L3/04B60L7/14B60L15/20B60L15/2009B60L2210/40B60L2220/14B60L2220/16B60L2240/42B60L2240/421B60L2240/423B60L2240/427B60L2240/429H02P3/14H02P21/36H02P29/032H02P29/0241Y02T10/64Y02T10/72H02P27/06H02P29/024
Inventor B.劳特J.格洛宁
Owner VOITH PATENT GMBH