CRANKCASE HEATER SYSTEMS AND METHODS FOR VARIABLE SPEED COMPRESSORS
First Claim
Patent Images
1. A system comprising:
- a compressor including a shell housing a compression mechanism driven by an electric motor in an on state and not driven by the electric motor in an off state;
a variable frequency drive that drives the electric motor in the on state by varying a frequency of a voltage delivered to the electric motor and that supplies electric current to a stator of the electric motor in the off state to heat the compressor.
5 Assignments
0 Petitions
Accused Products
Abstract
A system includes a compressor having a shell housing a compression mechanism driven by an electric motor in an on state and not driven by the electric motor in an off state. The system also includes a variable frequency drive that drives the electric motor in the on state by varying a frequency of a voltage delivered to the electric motor and that supplies electric current to a stator of the electric motor in the off state to heat the compressor.
59 Citations
20 Claims
-
1. A system comprising:
-
a compressor including a shell housing a compression mechanism driven by an electric motor in an on state and not driven by the electric motor in an off state; a variable frequency drive that drives the electric motor in the on state by varying a frequency of a voltage delivered to the electric motor and that supplies electric current to a stator of the electric motor in the off state to heat the compressor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method comprising:
-
driving a compression mechanism of a compressor with an electric motor by driving the electric motor with a variable frequency drive that varies a frequency of a voltage delivered to the electric motor in an on state, and not driving the compression mechanism with the electric motor in an off state; heating the compressor by supplying electric current to a stator of the electric motor with the variable frequency drive to heat the stator of the electric motor in the off state. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification