Inverter device and air conditioning system using inverter device
First Claim
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1. An inverter device for driving a sensorless DC brushless motor, comprising:
- an inverter circuit for switching a direct-current voltage obtained from a direct-current power source and supplying an alternating-current current of a sinusoidal wave to the sensorless DC brushless motor; and
current detecting means for detecting a power supply current between the direct-current power source and the inverter circuit, wherein the sensorless DC brushless motor includes stator windings of a three-phase wiring (U, V, W) electrically connected to the inverter circuit and a magnet rotor, and the current detecting means is a single current detecting means which is used also for detecting the current flowing in the stator windings, and by detecting the current flowing in the stator windings as well as detecting the power supply current, a rotational position of the magnet rotor is judged to thereby control the switching of the inverter circuit.
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Abstract
A current sensor for detecting a power supply current is commonly used for detecting a current of a stator winding to detect a rotational position of a magnet rotor, so that a sinusoidal driving is realized without adding two current sensors for detection of a phase current, and also a phase shift circuit and a comparator needed in the conventional 120-degree current feeding are not required, and the number of components can be reduced. Therefore, an inverter device with a low noise and low vibration, having a small size, light weight and high reliability is obtained.
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Citations
16 Claims
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1. An inverter device for driving a sensorless DC brushless motor, comprising:
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an inverter circuit for switching a direct-current voltage obtained from a direct-current power source and supplying an alternating-current current of a sinusoidal wave to the sensorless DC brushless motor; and
current detecting means for detecting a power supply current between the direct-current power source and the inverter circuit, wherein the sensorless DC brushless motor includes stator windings of a three-phase wiring (U, V, W) electrically connected to the inverter circuit and a magnet rotor, and the current detecting means is a single current detecting means which is used also for detecting the current flowing in the stator windings, and by detecting the current flowing in the stator windings as well as detecting the power supply current, a rotational position of the magnet rotor is judged to thereby control the switching of the inverter circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An air conditioner comprising a compressor, a sensorless DC brushless motor acting as a driving source of the compressor, and an inverter device adapted for driving the brushless motor,
wherein the inverter device comprises: -
an inverter circuit for switching a direct-current voltage obtained from a direct-current power source and supplying an alternating-current current of a sinusoidal wave to the sensorless DC brushless motor; and
current detecting means for detecting a power supply current between the direct-current power source and the inverter circuit, wherein the sensorless DC brushless motor includes stator windings of a three-phase wiring (U, V, W) electrically connected to the inverter circuit and a magnet rotors, and the current detecting means is a single current detecting means which is used also for detecting the current flowing in the stator windings, and by detecting the current flowing in the stator windings as well as detecting the power supply current, a rotational position of the magnet rotor is judged to thereby control the switching of the inverter circuit. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification