METHOD FOR DETERMINING LOADING OF A BEARING, A COMPUTER PROGRAM PRODUCT, A CONTROL FACILITY AND A DRIVE
First Claim
1. A method for determining loading of a bearing of an electrical machine, the method comprising:
- a) determining a rotational speed and an angular acceleration of a rotor of the electrical machine, wherein the rotor is supported in the bearing;
b) assigning respective matrix elements of a matrix to respective ranges of the angular acceleration and to respective ranges of the rotational speed in one-to-one correspondence;
c) when the electrical machine is operated in a respective range of the angular acceleration and a respective range of the rotational speed corresponding to the respective matrix element for a predefined time unit, adding an elementary variable to the respective matrix element, and otherwise leaving the respective matrix element unchanged; and
d) determining the loading of the bearing as a weighted sum of the matrix elements of the matrix.
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Abstract
In a method for determining loading of a bearing supporting a rotor of an electrical machine, the rotational speed and angular acceleration of the rotor is determined, matrix elements of a matrix are assigned to respective ranges of the angular acceleration and to respective ranges of the rotational speed, when the electrical machine is operated in a respective range of the angular acceleration and the rotational speed corresponding to the respective matrix element for a predefined time unit, an elementary variable, for example a value of 1, is added to the respective matrix element, and the loading of the bearing is determined as a weighted sum of the matrix elements. Thus, the matrix forms a representation of the operating time of the bearing and of the service life over time in relation to the rotational speeds and angular accelerations. The loading can be shown on a display.
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Citations
17 Claims
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1. A method for determining loading of a bearing of an electrical machine, the method comprising:
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a) determining a rotational speed and an angular acceleration of a rotor of the electrical machine, wherein the rotor is supported in the bearing; b) assigning respective matrix elements of a matrix to respective ranges of the angular acceleration and to respective ranges of the rotational speed in one-to-one correspondence; c) when the electrical machine is operated in a respective range of the angular acceleration and a respective range of the rotational speed corresponding to the respective matrix element for a predefined time unit, adding an elementary variable to the respective matrix element, and otherwise leaving the respective matrix element unchanged; and d) determining the loading of the bearing as a weighted sum of the matrix elements of the matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A control facility determining loading of a bearing of an electrical machine, comprising:
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a computing unit, and a display configured to display the loading of the bearing, wherein the computing unit is configured to a) determine a rotational speed and an angular acceleration of a rotor of the electrical machine, wherein the rotor is supported in the bearing; b) assign matrix elements of a matrix to respective ranges of the angular acceleration and to respective ranges of the rotational speed in one-to-one correspondence; c) when the electrical machine is operated in a respective range of the angular acceleration and a respective range of the rotational speed corresponding to the respective matrix element for a predefined time unit, add an elementary variable to the respective matrix element, and otherwise leave the respective matrix element unchanged; and d) determine the loading of the bearing as a weighted sum of the matrix elements of the matrix.
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15. A drive, comprising:
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an electrical machine, a current supply, and a control facility determining loading of a bearing of an electrical machine, the control facility comprising a computing unit, and a display configured to display the loading of the bearing, wherein the computing unit is configured to a) determine a rotational speed and an angular acceleration of a rotor of the electrical machine, wherein the rotor is supported in the bearing; b) assign matrix elements of a matrix to respective ranges of the angular acceleration and to respective ranges of the rotational speed in one-to-one correspondence; c) when the electrical machine is operated in a respective range of the angular acceleration and a respective range of the rotational speed corresponding to the respective matrix element for a predefined time unit, add an elementary variable to the respective matrix element, and otherwise leave the respective matrix element unchanged; and d) determine the loading of the bearing as a weighted sum of the matrix elements of the matrix. - View Dependent Claims (16, 17)
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Specification