Patent US3565167A successfully refreshed from Google Patents.
US3565167A
Expired / Lapsed
US
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Electrical machine provided with a cooling device
Assignee: Rheinmetall Air Defence AG
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Filing: 1969-01-22
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Granted: 1971-02-23
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Expires: 1989-01-22
Abstract
Abstract There is disclosed a cooling device for electrical equipment, especially an electrical machine, wherein the cooling action is derived due to the effect of the heat required for changing the phase of a cooling agent. The cooling device incorporates means defining at least one hollow compartment provided at least at one machine portion which tends to rise in temperature or heat up. A solid fusible or meltable cooling agent is provided for this hollow compartment, this solid meltable cooling agent possessing a melting point which is above a predetermined operating temperature and beneath a permissible maximum temperature of the electrical machine.
Inventors
- 👤 Hans Eder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:38
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/22; Y; Y10; Y10S; Y10S165/00; Y10S165/902
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
157 words
In combination with an electrical machine, a cooling device for such electrical machine wherein there is effective the heat required for changing the phase of the cooling agent, comprising means defining at least one hollow compartment provided at least at one machine portion which tends to heat up, a solid meltable cooling agent provided in said hollow compartment, said solid meltable cooling agent possessing a melting point which is above a predetermined normal operating temperature of the electrical machine and beneath a permissible maximum temperature of the electrical machine, so that only upon encountering sudden high loads for a short period of time which might cause said one machine portion to heat up to a temperature exceeding the melting point of the solid meltable cooling agent is there a change of phase from solid to liquid of a sufficient quantity of the solid meltable cooling agent to prevent said machine portion from exceeding said permissible maximum temperature.
Claim 2
Dependent Claim
157 words
In combination with an electrical machine, a cooling device for such electrical machine wherein there is effective the heat required for changing the phase of the cooling agent, comprising means defining at least one hollow compartment provided at least at one machine portion which tends to heat up, a solid meltable cooling agent provided in said hollow compartment, said solid meltable cooling agent possessing a melting point which is above a predetermined normal operating temperature of the electrical machine and beneath a permissible maximum temperature of the electrical machine, so that only upon encountering sudden high loads for a short period of time which might cause said one machine portion to heat up to a temperature exceeding the melting point of the solid meltable cooling agent is there a change of phase from solid to liquid of a sufficient quantity of the solid meltable cooling agent to prevent said machine portion from exceeding said permissible maximum temperature.
Claim 3
Dependent Claim
37 words
The combination as defined in claim 1, wherein said electrical machine is constructed as a servomotor having a rotor, said rotor being equipped with said at least one hollow compartment provided with said solid meltable cooling agent.
Claim 4
Dependent Claim
15 words
The combination as defined in claim 1, wherein said cooling agent is a hydrocarbon compound.
Claim 5
Dependent Claim
14 words
The combination as defined in claim 1, wherein said cooling agent is an eiconsane.
Claim 6
Dependent Claim
14 words
The combination as defined in claim 1, wherein said cooling agent is a paraffin.
Claim 7
Dependent Claim
146 words
A cooling device for electrical equipment, in particular for a heat-dissipating electrical machine, comprising means defining at least one hermetically sealed hollow compartment directly forming at least a portion of the electrical equipment which tends to rise in temperature, a solid meltable cooling agent provided in said hollow compartment, said solid meltable cooling agent possessing a melting point which is above a predetermined operating temperature of the electrical equipment and beneath a permissible maximum temperature for such electrical equipment, so that upon encountering sudden high loads for a short period of time which might cause said one machine portion to heat up to a temperature exceeding the melting point of the solid meltable cooling agent is there a change of phase from solid to liquid of a sufficient quantity of the solid meltable cooling agent to prevent said machine portion from exceeding said permissible maximum temperature.
Claim 8
Dependent Claim
146 words
A cooling device for electrical equipment, in particular for a heat-dissipating electrical machine, comprising means defining at least one hermetically sealed hollow compartment directly forming at least a portion of the electrical equipment which tends to rise in temperature, a solid meltable cooling agent provided in said hollow compartment, said solid meltable cooling agent possessing a melting point which is above a predetermined operating temperature of the electrical equipment and beneath a permissible maximum temperature for such electrical equipment, so that upon encountering sudden high loads for a short period of time which might cause said one machine portion to heat up to a temperature exceeding the melting point of the solid meltable cooling agent is there a change of phase from solid to liquid of a sufficient quantity of the solid meltable cooling agent to prevent said machine portion from exceeding said permissible maximum temperature.
Claim 9
Dependent Claim
145 words
A cooling device for preventing the rotor of an electrical machine, especially a servomotor, from exceeding a permissible maximum temperature, comprising means constituting part of said rotor and defining at least one hollow compartment directly at the rotor, a solid meltable cooling agent provided for said hollow compartment, said solid meltable cooling agent possessing a melting point which is above a predetermined normal operating temperature for the rotor and beneath a permissible maximum temperature of such rotor, the heat developed at the rotor during Short-period peak loads at the electrical machine being utilized to melt said solid cooling agent to thus limit the temperature which said rotor is subjected to prevent such from exceeding the permissible maximum temperature, the latent heat stored by said cooling agent being dissipated during the time interval between peak loads so that the cooling agent again at least partially solidifies.
Claim 10
Dependent Claim
145 words
A cooling device for preventing the rotor of an electrical machine, especially a servomotor, from exceeding a permissible maximum temperature, comprising means constituting part of said rotor and defining at least one hollow compartment directly at the rotor, a solid meltable cooling agent provided for said hollow compartment, said solid meltable cooling agent possessing a melting point which is above a predetermined normal operating temperature for the rotor and beneath a permissible maximum temperature of such rotor, the heat developed at the rotor during Short-period peak loads at the electrical machine being utilized to melt said solid cooling agent to thus limit the temperature which said rotor is subjected to prevent such from exceeding the permissible maximum temperature, the latent heat stored by said cooling agent being dissipated during the time interval between peak loads so that the cooling agent again at least partially solidifies.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |