Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
  • H02P21/05—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
  • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
  • H02P21/20—Estimation of torque
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
  • H02P23/04—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
  • H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
  • H02P29/40—Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load

Definitions

• the invention relates to a method for determining a delivery torque of an electric drive according to the preamble of independent claim 1, of a corresponding device for determining a delivery torque of an electric drive according to the preamble of independent claim 8, and of a computer program product with program code for performing the Method for determining a delivery torque of an electric drive.
• the motor current consumption is measured in order to infer the delivered torque of the electric motor.
• This information can be used for control purposes (FOR - field-oriented control) or for safety functions.
• the relationship between current and ideal output torque can be determined from an ideal motor model of the electric motor.
• electric motors have still other moments, such as e.g. Bearing friction, cogging torques, etc., which can change the output torque of the electric motor. Therefore, the actual output torque of the electric motor no longer coincides with the ideal output torque of the electric motor and there is no direct relationship between the measured current and the actual output torque of the electric motor.
• the inventive method for determining a dispense torque of an electric drive with the features of independent claim 1 has the advantage that from calculated disturbance torques a correction current is calculated, from a measured current and the correction current a corrected current is determined and output which is a real one
• Output torque of the electric drive represents.
• the inventive device for determining a dispense torque of an electric drive with the features of independent claim 8 has the advantage that a computing unit is provided which calculates a correction current from determined disturbance, wherein from a measured current and the correction current, a corrected current can be determined and output is, which represents a real output torque of the electric drive.
• the device comprises means for measuring the current drawn by the electric drive.
• Embodiments of the present invention correct the measured current measurements by an amount corresponding to the disturbance torques.
• the adjusted current measurement makes it possible, with the aid of the ideal motor model, to deduce the actual output torque of the electric drive, which is designed, for example, as a synchronous machine, asynchronous machine, DC motor, etc. Therefore, subsequent subsystems that use the result of the current measurement to conclude the real output torque may advantageously operate at a higher quality.
• the aid of embodiments of the present invention which provide an improved current measurement adapted to the respective system, the following subsystems can work with value-adjusted standard methods.
• a real electric drive differs from an ideal electric drive in such a way that the ideal output torque is superimposed on a disturbance torque.
• the ideal output torque results from the electrical engine equations.
• the disturbance torque results essentially from mechanical conditions, which relate, for example, friction and cogging torques. Since these influencing factors are generally undesirable, they are assigned to the disturbance variables.
• the disturbance torques can be determined in advance by measuring or simulating and stored in appropriate form for signal processing. Finally, the actual output torque results from the sum of the ideal output torque and the disturbance torques.
• the ideal output torque can be calculated from the measured current using the corresponding motor equation.
• the engine equation depends on the type of electric drive used.
• the aim of the current correction according to the invention is to determine the corrected current so that the real output torque can be determined directly using the ideal motor model.
• the correction current is determined according to the invention based on the determined disturbance torque.
• the correction current results from the inverse moment equation of the ideal motor model.
• the disturbance torque can be determined for the respective electric drive or electric motor or the respective motor type with the aid of measurements and stored in an appropriate form in the system for signal processing. This results in a specific conversion formula as a function of the disturbance torque for the correction current.
• Embodiments of the invention can be used in principle as an extension of the current measurement of electric motors.
• As a possible application can be mentioned, for example, electrically assisted steering systems.
• influencing factors of disturbance torques are applied as input quantities for at least one disturbance torque characteristic field, which is used for
• the disturbance torques comprise, for example, friction moments and / or cogging torques which are influenced by rotational speed and / or rotational angle.
• the at least one disturbance torque characteristic field can be determined and stored beforehand by means of corresponding measurements and / or simulations.
• the disturbance torque with respect to friction depends in particular on the speed of the electric drive.
• the disturbance torque is particularly dependent on the angle of rotation of the electric drive.
• the generation and storage of disturbance torque maps advantageously makes it possible to quickly and reliably determine the correction current and the associated corrected current, which represents the real output torque of the electric drive.
• an ideal output torque of the electric drive is calculated based on the measured current with an engine equation of a corresponding ideal engine model. Furthermore, the real output torque of the electric drive is calculated based on the corrected current using the motor equation of the corresponding ideal motor model.
• the corrected current which represents the real output torque of the electric drive, used as an input variable for a torque control and / or speed control of the electric drive and / or for Fahrschreibsfunktio- NEN.
• At least one disturbance torque characteristic field which has influencing factors of disturbance torques as input variables, is stored in a map memory, which is connected to the map memory
• Computing unit is coupled, the arithmetic unit depending on current ! The speed and / or current angle of rotation of the electric drive a corresponding Störmomentken nfeld for calculating the correction current determined.
• Embodiments of the present invention can be realized as a circuit, device, method, data processing program with program code means and / or as a computer program product. Accordingly, embodiments of the present invention may be implemented entirely in hardware and / or software and / or a combination of hardware and / or software components. In addition, the present invention may be embodied as a computer program product on a computer usable storage medium having computer readable program code, whereby various computer readable storage media such as hard disks, CD-ROMs, optical or magnetic storage elements, etc. may be used.
• Fig. 1 shows a schematic block diagram of a real electric drive.
• Figure 2 shows a schematic block diagram of an idealized electric drive, with an embodiment of a device according to the invention for.
• a real electric drive 20 differs in this way from an ideal electric drive 10 that has an ideal output torque the ideal electric drive 10 a disturbance torque is superimposed.
• the ideal release moment of the ideal electric drive 10 results as a function of applied input quantities U, Phi from corresponding electrical motor equations, which are dependent on the design of the real electrical drive 20.
• the disturbance torque r results essentially from mechanical conditions, such as friction and / or cogging torques. Since these influencing factors are generally undesirable, they are assigned to the disturbance variables.
• the real output torque results of the real electric drive 20 from equation
• the engine equation depends on the engine type. Therefore, the engine equation is kept general here and with designated. Due to the relationship shown in equation (2), in the driving technique of electric motors, in many cases, the absorbed current I is measured to judge the output torque of the motor. This information can be used for control purposes (FOR - field-oriented control) or for safety functions.
• the relationship between the current I and the ideal output torque can be determined from the ideal engine model.
• real motors 20, as stated above still have other torques, which is the ideal output torque of the ideal electric drive 10. Therefore, the real output torque is right of the real electric drive 20 no longer with the ideal output torque of the ideal electric drive 10 match. A direct relationship between the measured current I and the real output torque M rea , therefore no longer exists.
• a correction current calculated, wherein from the measured current I and the correction current a corrected current I * is determined and output, which is a real output torque of the real electric drive 20 represents.
• Embodiments of the present invention correct the measured current readings I by an amount that reduces the disturbance moments M r corresponds troublefree.
• the adjusted measured current ⁇ makes it possible, with the aid of the ideal motor model, to determine the real output moment of the real motor
• Output torque M rea i represents. Therefore, subsequent subsystems which use the corrected current I * to conclude the real output torque M rea i can operate with a higher quality.
• the idealized electric drive comprises
• the device 32 comprises a computing unit 38, which uses the determined disturbance torques calculates the correction current.
• the device 32 determines from the measured current I and the calculated correction current a corrected current which is the real output torque of the real electric drive 20 and output from the device 32.
• the device 32 comprises a map memory 36, in which at least one disturbance torque map for calculating the correction current is stored.
• the at least one disturbance torque map has influencing factors of disturbance torques as input variables.
• the at least one disturbance torque characteristic field is determined in advance by means of corresponding measurements and / or simulations, for example, and stored in the characteristic memory 36.
• the characteristic memory 36 is coupled to the arithmetic unit 38, which in dependence on the current speed and / or current angle of rotation of the electric drive 20, a corresponding disturbance torque map to
• the arithmetic unit 38 provides the calculated correction current an adder 34, which in a summing point 34.1 the measured current I and the correction current to generate the corrected current I *.
• the functionality of the adder 34 and the means 34.1 implemented as summation point for measuring the current I can also be integrated into the arithmetic unit 38.
• the goal of the current correction is that the adjusted current I * takes a value so that, using the ideal motor model, the real output torque M rea i can be directly determined according to equation (3).
• equation (3) yields the equations (3.1) to (3.3):
• equation (3) can be transformed into equation (4.1) and further into equation (4.2),
• phase currents can be represented as a vectorial quantity, each with a component in the d and q direction.
• the moment equation of the synchronous machine shows equation (7).
• Zp is the number of pole pairs
• ⁇ ⁇ is the permanent magnet flux
• L d and L q are the inductances in the d and q directions
• i d and i q are the currents in the d and q directions.
• the disturbance torque is determined in advance and in
• Embodiments of the present invention can be realized as a circuit, device, method, data processing program with program code means and / or as a computer program product. Accordingly, the present invention may be implemented entirely in hardware and / or software and / or a combination of hardware and / or software components. In addition, the present invention may be embodied as a computer program product on a computer usable storage medium having computer readable program code, whereby various computer readable storage media such as hard disks, CD-ROMs, optical or magnetic storage elements, etc. may be used.
• the computer usable or computer readable media may include, for example, electronic, magnetic, optical, electromagnetic infrared or semiconductor systems, devices, devices or distribution media.
• the computer-readable media may include an electrical connection to one or more lines, a portable computer disk, a random access memory (RAM), a read only memory (ROM), an erasable and programmable read only memory (EPROM or flash memory)
• RAM random access memory
• ROM read only memory
• EPROM erasable and programmable read only memory
• the computer usable or computer readable medium may even be paper or other suitable medium on which the program is written and of which it is, for example by optical scanning of the paper or the other Medium is electrically detectable, then compiled, interpreted or if necessary processed in other ways and then stored in the computer memory.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Control Of Electric Motors In General (AREA)
• Control Of Ac Motors In General (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2010
  • 2010-03-22 DE DE102010003094A patent/DE102010003094A1/de not_active Withdrawn
• 2011
  • 2011-03-17 JP JP2013500437A patent/JP5744169B2/ja not_active Expired - Fee Related
  • 2011-03-17 EP EP11709381A patent/EP2550731A2/de not_active Ceased
  • 2011-03-17 WO PCT/EP2011/054047 patent/WO2011117139A2/de not_active Ceased
  • 2011-03-17 CN CN201180015036.1A patent/CN102870321B/zh not_active Expired - Fee Related

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