Driving device, compressor, air conditioner and method of driving interior permanent magnet motor
AssigneeMitsubishi Electric Corporation
InventorsYuji Hirosawa, Masahiro Nigo
Life of this patent
Estimating the term…
Abstract
A driving device includes a connection switching unit that switches connection condition of a coil between Y connection and delta connection, an inverter, and a control device that controls a carrier frequency of the inverter. The carrier frequency is set at a first carrier frequency when the connection condition of the coil is the Y connection. The carrier frequency is set at a second carrier frequency when the connection condition of the coil is the delta connection.
Claims15
A driving device to drive an interior permanent magnet motor including a coil, comprising:
- a connection switching unit to switch connection condition of the coil between first connection condition and second connection condition, the second connection condition lowering line voltage of the coil compared to the first connection condition;
- an inverter to apply voltage to the coil;
- and
- a control device to control a carrier frequency of the inverter for adjusting a control frequency of the voltage applied to the coil, wherein
- the carrier frequency is set at a first carrier frequency when the connection condition of the coil is the first connection condition, and
- the carrier frequency is set at a second carrier frequency different from the first carrier frequency when the connection condition of the coil is the second connection condition.
A compressor comprising:
- an interior permanent magnet motor including a coil;
- a compression mechanism driven by the interior permanent magnet motor;
- a connection switching unit to switch connection condition of the coil between first connection condition and second connection condition, the second connection condition lowering line voltage of the coil compared to the first connection condition;
- an inverter to apply voltage to the coil;
- and
- a control device to control a carrier frequency of the inverter for adjusting a control frequency of the voltage applied to the coil, wherein
- the carrier frequency is set at a first carrier frequency when the connection condition of the coil is the first connection condition, and
- the carrier frequency is set at a second carrier frequency different from the first carrier frequency when the connection condition of the coil is the second connection condition.
A method of driving an interior permanent magnet motor including a coil, comprising:
- switching connection condition of the coil between first connection condition and second connection condition, the second connection condition lowering line voltage of the coil compared to the first connection condition;
- setting a carrier frequency of an inverter for adjusting a control frequency of voltage applied to the coil at a first carrier frequency when the connection condition of the coil is the first connection condition;
- and
- setting the carrier frequency at a second carrier frequency different from the first carrier frequency when the connection condition of the coil is the second connection condition.
Dependencies are inferred from the claim text.