Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1998-10-20
2000-01-11
Nappi, Robert E.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318138, 318254, 318439, H02P 126
Patent
active
060140046
ABSTRACT:
When a lock detector detects a locked state of a DC motor in a starting stage, a torque increasing circuit immediately selects a starting sequence pattern of an output torque that is greater in magnitude by one preselected step, and outputs the selected output torque to a starting sequence controller, so that a compressor can be restarted speedily without repeating starting failures. A compressor, driven by a DC motor, has a shell of an internal pressure approximately equal to the pressure of an inhalation gas. An inverter is provided to make the speed of the DC motor variable. A rotational frequency setting circuit sets the rotational frequency of the DC motor to a frequency that is not greater than the frequency of a commercial power source when the internal temperature of a refrigerator is stabilized. By this construction, the power consumption can be remarkably reduced.
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Hamaoka Kouji
Kurimoto Kazunori
Ogahara Hideharu
Ogawa Keiji
Satomura Takashi
Leykin Rita
Matsushita Refrigeration Company
Nappi Robert E.
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