Starting control method of and control apparatus for synchronous motor, and air conditioner, refrigerator, washing machine and vacuum cleaner each provided with the control apparatus
AssigneeHitachi, Ltd.
InventorsYukio Kawabata, Tsunehiro Endo, Makoto Ishii, Yuhachi Takakura, Toru Inoue
Life of this patent
Estimating the term…
Abstract
After the rotor position has been fixed prior to the start of a motor, the driving mode can be rapidly switched to sensorless driving and the motor can be started and controlled, by conducting current conversions in such a power supply pattern that increases the starting output torque of the motor, and controlling the inverter output voltage.
Claims12
A synchronous-motor starting method using an inverter which has a direct-current power supply and a power output means for supplying stator coils of multiple phases with power based on a direct-current voltage, and is designed to change power supply phases and drive a synchronous motor,
- wherein the synchronous-motor starting method is characterized in that a first power supply pattern, a second power supply pattern, and a third power supply pattern are provided as three successive startup power supply patterns, and in that when the power supply period corresponding to said first power supply pattern, the power supply period corresponding to said second power supply pattern, and the power supply period corresponding to said third power supply pattern are taken as T1, T2, and T3, respectively, these periods are maintained in the relationship of T1>T3≧T2≧0.
A synchronous-motor control apparatus equipped with an inverter which has a direct-current power supply and a power output means for supplying stator coils of multiple phases with power based on a direct-current voltage, and is designed to change power supply phases and drive a synchronous motor,
- wherein the synchronous-motor control apparatus is characterized in that said inverter has an inverter circuit, a control circuit, a driver unit for driving said inverter circuit, and a rotor information detection unit, in that said control circuit comprises a starting unit, a power supply phase setting unit, a selection unit, a speed control unit, and a driving signal generating unit, in that the power supply phase signal transmitted from said starting unit to said power supply phase setting unit includes a first power supply pattern, a second power supply pattern, and a third power supply pattern, as three successive startup power supply patterns for said synchronous motor, and in that when the power supply period corresponding to said first power supply pattern, the power supply period corresponding to said second power supply pattern, and the power supply period corresponding to said third power supply pattern are taken as T1, T2, and T3, respectively, these periods are maintained in the relationship of T1>T3≧T2≧0.
Dependencies are inferred from the claim text.