Method and device for the sensor-free position determination of an electronically commutated electric machine

A technology of electronic commutation and rotor position, applied in the direction of electronic commutation motor control, electronic commutator, electric device, etc., can solve the problem that the permanent voltage pre-regulation cannot be realized, etc.

Active Publication Date: 2013-05-15
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A permanent voltage presetting that is advantageous, e.g. for noisy situations, cannot be achieved with the back EMF method (no blanking period)

Method used

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  • Method and device for the sensor-free position determination of an electronically commutated electric machine
  • Method and device for the sensor-free position determination of an electronically commutated electric machine
  • Method and device for the sensor-free position determination of an electronically commutated electric machine

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Embodiment Construction

[0036] FIG. 1 shows a simplified illustration of a three-phase electronically commutated electric machine 1 as an inner rotor electric machine. A stator 2 with three stator teeth 3 arranged offset by 120° with respect to each other can be seen. In practice, the number of stator teeth 3 on the stator 2 is generally greater and eg corresponds to a multiple of three, such as nine, twelve or eighteen.

[0037] The stator teeth 3 are each provided with phase windings 4 and provide a component of the stator magnetic field when energized accordingly. The stator windings 4 are connected to each other in a conventional manner in a delta connection or in a star connection. Each of the stator windings 4 can be energized through a corresponding phase connection (not shown) of the electric machine 1 .

[0038] Inside the stator 2, a rotor 5 serving as an armature of the electric machine 1 is arranged in a rotationally movable manner, the rotor being Figure 1a In the simplified illustrat...

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PUM

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Abstract

The invention relates to a method for determining a rotor position of a rotatory, multi-phase, electronically commutated electric machine (1). Said electric machine (1) comprises several phase windings (4) which can be supplied with current by means of phase connectors. Said method consists of the following steps: phase currents and phase connections are identified on phase connections of the electric machine (1); the induced currents on the phase connections of the electric machine (1) are determined from the identified phase currents and phase flows; the identified current indicator of the induced current is provided with respect to a Cartesian coordination system which is fixed to a stator by the induced currents; the position of the rotor is identified as a space indicator angle of the current indicator of the induced current provided with respect to the Cartesian coordination system which is fixed to the stator.

Description

technical field [0001] The invention relates to a commutated electric machine, in particular to a method for sensorless position detection of a rotor of an electric machine. Background technique [0002] In order to electronically commutate a brushless motor, it is necessary to know information about the current rotor position. The electronic commutation is carried out by means of the rotor position by applying phase voltages to the electric machine as a function of the rotor position or, in the case of operation as a generator, taking off the phase voltages at the electric machine. [0003] Different methods for determining the rotor position are known. For a group of electric machines, the rotor position is detected by an integrated or separate position sensor and provided to a control unit for electronic commutation. For another group of machines, the rotor position is determined without sensors from the motor voltage and / or the motor current. [0004] A known method f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18H02P21/14
CPCH02P21/146H02P6/182G01B7/30H02P21/18
Inventor D.弗里克A.赖斯
Owner ROBERT BOSCH GMBH
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