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Method and device for determining a momentary torque of an electronically switched electric machine and for regulating the average torque

A technology of rated torque and motor, applied in the direction of electronic commutation motor control, motor generator control, control generator, etc., can solve the problems of affecting motor power, phase current measurement, etc.

Inactive Publication Date: 2013-03-13
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The measurement of the phase currents is generally complex to implement and, for example, when using measuring resistors (shunts), can lead to measurement losses which affect the power of the electric machine and are therefore undesirable

Method used

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  • Method and device for determining a momentary torque of an electronically switched electric machine and for regulating the average torque
  • Method and device for determining a momentary torque of an electronically switched electric machine and for regulating the average torque
  • Method and device for determining a momentary torque of an electronically switched electric machine and for regulating the average torque

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Embodiment Construction

[0034] FIG. 1 shows a schematic illustration of an electric motor system 1 with an electric machine 2 which can be designed as a synchronous motor, an asynchronous motor or the like. The electric motor 2 is assumed below as electric machine 2; however, it can also be a torque-driven generator. The electric motor 2 is electronically commutated, that is to say the electric motor does not have a rotor winding which must be supplied electrically from the outside, for example via a mechanical commutator or via sliding contacts. In the case of a synchronous motor, the rotor is provided with permanent magnets, which form the rotor poles to provide the excitation magnetic field. Furthermore, a plurality of phase strings are provided on the respective stator, which phase strings are actuated by applying phase voltages or phase potentials in order to generate a magnetic field in a direction dependent on a voltage vector determined by the phase voltages. This magnetic field is generated...

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PUM

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Abstract

The invention relates to a method for determining an actual torque of a multiphase electric machine (2), said electric machine (2) being controlled by means of a driver circuit (3), whereby phase voltage or phase potential profiles are applied to phases of the electric machine (2), said method comprising the following steps: the received electric power (PEl) and the ohmic power loss of the electric machine (2) is determined; the mechanical power (PMech) provided by the electric machine (2) is determined by a power balance according to the received electric power and the ohmic losses; and the actual torque (MIst) is determined on the basis of the determined mechanical power (PMech).

Description

technical field [0001] The invention relates to electronically commutated electric machines, in particular electric machines which are to provide a torque according to a predetermined setpoint torque. Background technique [0002] Multi-phase electronically commutated electrical machines such as synchronous motors, asynchronous motors etc. are generally known. A control unit is used for operating such an electric machine, which controls the drive circuit in order to set the desired torque by specifying the phase voltage profile. The corresponding phase voltages can be adjusted by means of so-called pulse width modulation by alternating high and low potentials in each phase branch. The voltage applied to the phase strings can thus be effectively adjusted by means of the predetermined duty cycle of the pulse width modulation. [0003] Feedback about the torque provided by the electric machine is generally obtained by evaluating the phase currents, so that the torque provided...

Claims

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Application Information

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IPC IPC(8): H02P23/00H02P21/14H02P27/04
CPCH02P23/004H02P27/042H02P21/148H02P23/30
Inventor D.弗里克G.克内希特
Owner ROBERT BOSCH GMBH
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