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(12) Patent: | (11) CA 1169501 |
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(21) Application Number: | 1169501 |
(54) English Title: | LONG-TIME CONSTANT THERMAL ANALOG |
(54) French Title: | DISPOSITIF A GRANDE CONSTANTE DE TEMPS A CARACTERISTIQUES SEMBLABLES A CELLES D'UN DISPOSITIF THERMIQUE |
Status: | Term Expired - Post Grant |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : | |
(71) Applicants : | |
(74) Agent: | OLDHAM AND COMPANYOLDHAM AND COMPANY, |
(74) Associate agent: | |
(45) Issued: | 1984-06-19 |
(22) Filed Date: | 1980-08-27 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | None |
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ABSTRACT OF THE DISCLOSURE
This device provides electrical characteristics
which are the analog of the thermal characteristics of a
device whose thermal behaviour is being monitored. This
device utilizes a resistor-capacitor network to provide an
analog circuit which equates the thermal conditions in the
rotor of a dynamoelectric machine to the voltage build-up
in the capacitor of the analog circuit. In order to keep
the size of the capacitor within reasonable limits, a
sampling technique is used to connect the capacitor into
the electrical circuit for short periods only. This has
the effect of multiplying the size of the capacitor.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
Sorry, the representative drawing for patent document number 1169501 was not found.
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Description | Date |
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Inactive: Expired (old Act Patent) latest possible expiry date | 2001-06-19 |
Grant by Issuance | 1984-06-19 |
There is no abandonment history.
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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None |
Past Owners on Record |
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MALCOLM W. HAMILTON |