US 8,777,585 B2 · Electric compressor

Abstract

An electric compressor 10 includes a compression mechanism 11, an electric motor 12 driving the compression mechanism 11, and a control portion 13 controlling to drive the electric motor 12, incorporated into a single casing, and further includes a temperature detector 14 detecting a temperature of one or more components constituting one or both of the control portion 13 and the electric motor 12, and a current detector 15 detecting a current flowing through the component. When the temperature detected by the temperature detector 14 is a temperature Td, the current detected by the current detector 15 is a current Id, and a current corresponding to the temperature Td at a temperature characteristic relating to the current specific to the component is a current Ia(Td), the control portion 13 stops driving the electric motor 12 on the basis of a result of comparison between Ia(Td) and Id.

Claims26

Dependent claims

A method of controlling an electric compressor that includes a compression mechanism that sucks in a refrigerant and compresses and discharges the refrigerant, an electric motor that drives said compression mechanism, a casing that houses said compression mechanism and said electric motor, a control portion that is housed in said casing and controls to drive said electric motor, a temperature detector that detects a temperature of one or more components that constitute one or both of said control portion and said electric motor, and a current detector that detects a current flowing through said component, said method comprising the steps of:

detecting by said temperature detector a temperature Td;
detecting the current by said current detector when said temperature detector detects said temperature Td a current Id;
determining a current corresponding to said temperature Td at a temperature characteristic relating to the current specific to said component is a current Ia(Td);
and
stopping the driving of said electric motor on the basis of a result of comparison between Ia(Td) and Id by said control portion.

2 more elements

A method of controlling an electric compressor that includes a compression mechanism that sucks in a refrigerant and compresses and discharges the refrigerant, an electric motor that drives said compression mechanism, a casing that houses said compression mechanism and said electric motor, a control portion that is housed in said casing and controls to drive said electric motor, a temperature detector that detects a temperature of one or more components that constitute one or both of said control portion and said electric motor, and an electric power detector that detects electric power flowing through said component, said method comprising the steps of:

detecting by said temperature detector a temperature Td;
detecting the electric power by said electric power detector when said temperature detector detects said temperature Td is electric power Pd;
determining electric power corresponding to said temperature Td at a temperature characteristic relating to the electric power specific to said component is electric power Pa(Td);
and
stopping the driving of said electric motor on the basis of a result of comparison between Pa(Td) and Pd by said control portion.

2 more elements

An electric compressor, comprising:

a compression mechanism that sucks in a refrigerant and compresses and discharges the refrigerant;
an electric motor that drives said compression mechanism;
a casing that houses said compression mechanism and said electric motor;
a control portion that is housed in said casing and controls to drive said electric motor;
a temperature detector that detects a temperature Td of one or more components that constitute one or both of said control portion and said electric motor;
and
a current detector that detects a current Id flowing through said component when said temperature detector detects said temperature Td,
said control portion comprising a microcomputer configured to determine a current Ia(Td) corresponding to said temperature Td based on a temperature characteristic relating to the current specific to said component and to stop driving said electric motor on the basis of a result of comparison between Ia(Td) and Id.

5 more elements

An electric compressor characterized by comprising:

a compression mechanism that sucks in a refrigerant and compresses and discharges the refrigerant;
an electric motor that drives said compression mechanism;
a casing that houses said compression mechanism and said electric motor;
a control portion that is housed in said casing and controls to drive said electric motor;
a temperature detector that detects a temperature Td of one or more components that constitute one or both of said control portion and said electric motor;
and
an electric power detector that detects electric power Pd flowing through said component when said temperature detector detects said temperature Td,
said control portion comprising a microcomputer configured to determine electric power Pa(Td) corresponding to said temperature Td based on a temperature characteristic relating to the electric power specific to said component and to stop driving said electric motor on the basis of a result of comparison between Pa(Td) and Pd.

5 more elements

Dependencies are inferred from the claim text.

Electric compressor

Life of this patent

Electric compressor

Life of this patent

Abstract

Claims26