Refrigeration – Automatic control – Refrigeration producer
Patent
1996-11-13
1999-01-12
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62229, 62158, F25B 100
Patent
active
058573496
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a refrigerating apparatus executing a refrigeration cycle and having a compressor motor control device. The present invention also relates to a refrigerator control device used in the refrigerating apparatus for controlling a rotational frequency or speed of a refrigerator compressor. The present invention also relates to a brushless motor starter in which the position of rotor magnetic polls of a DC brushless motor having an inverter-controlled rotational frequency is detected in a sensor-less system.
BACKGROUND ART
There have been proposed a large number of refrigerators aimed at saving energy and improving the refrigerator's ability to refrigerate quickly by making the rotational frequency or speed of the compressor variable. For example, as disclosed in Japanese Laid-Open Patent Publication (unexamined) No. 2-140577, there is a trial of producing an effect by making the rotational frequency of a compressor of a refrigerator variable by means of an inverter.
A rotary compressor, as disclosed in the aforementioned prior art document, has generally been used as a compressor whose rotational frequency is made variable by an inverter. The rotary compressor has been so used because its refrigerating ability varies approximately linearly according to the chance of the rotational frequency and because it has had an excellent capability in that its lubricating ability depends less on the rotational frequency.
However, according to the conventional construction, there has been the following problems in using the rotary compressor.
In general, the rotary compressor has a high pressure inside its shell. That is, an inhalation gas having a low pressure is directly inhaled into a cylinder of its compressing section. The gas is then discharged once into the shell after compression. Thereafter, the gas is transferred into a cooling system through a discharge pipe. Thus, since the shell has a high internal pressure, it has been widely known that the gas having a high pressure and a high temperature leaks causing the gas to intrude into a cylinder inside the compression section. This leakage and intrusion is a factor in the reduction of the compression efficiency of the compressor (leakage heat loss).
However, the leakage heat loss has no relation to the rotational frequency, and depends on the magnitude of the high pressure and the magnitude of the low pressure. That is, there has been such a phenomenon that, when the rotational frequency has been lowered to reduce the refrigerating ability of the compressor itself, the rate of the leakage heat loss has increased, consequently reducing the efficiency of the compressor.
When the internal temperature of the refrigerator is stabilized, the need for great refrigerating ability is not present. In such a case, where energy saving is attempted by lowering the rotational frequency by an inverter to reduce the refrigerating ability, there has been a problem in that the energy saving effect cannot be obtained due to the reduction of the efficiency of the compressor.
Furthermore, in the case of a reciprocating compressor, the oil supplying ability depends on the rotational frequency. This dependence has caused a problem in that the reliability is degraded particularly at a low rotational frequency. Also, because the reciprocating compressor requires a large starting torque, smooth starting has not been able to be achieved.
Also, there has been proposed a method of starting a compressor motor control device wherein the position of rotor magnetic poles of a DC brushless motor, whose rotational frequency is controlled by an inverter, is detected by utilizing an induction voltage at the stator winding in a sensor-less system. This method, however, cannot effect the position detection when the motor is stopped, because no induction voltage is generated in such a state. Therefore, it has been a general practice to execute the starting according to a predetermined starting sequence pattern up to a specified rotational frequency at whi
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Hamaoka Kouji
Kurimoto Kazunori
Ogahara Hideharu
Ogawa Keiji
Satomura Takashi
Matsushita Refrigeration Company
Tanner Harry B.
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