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US 7,071,641 B2Granted
Motor control apparatus, and washing machine and drying machine using the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYasuhiro Arai, Hideki Nakata
Life of this patent
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Abstract
A motor control apparatus includes an inverter circuit for supplying driving power to a motor, a motor current detector for detecting current flowing through the motor, an inverter controller for controlling the inverter circuit based on the output of the detector. The inverter controller has a setting unit for setting various command values to control motor driving status, and a processing unit for controlling the inverter circuit based on the setting on the setting unit. The setting unit sets command value so that a load angle which is an angle between rotor axis and motor applied voltage is operated on the smaller side of the angle that provides the maximum output torque in the load angle-output torque characteristics.
Claims11
A sensorless motor control apparatus comprising:
- an inverter circuit that supplies driving power to a sensorless motor,
- a motor current detector that detects the current flowing in the motor, and
- an inverter controller that controls the inverter circuit on the basis of the output from the motor current detector, wherein
- the inverter controller includes:
- a setting unit that sets various command values for controlling the operation state of the motor;
- and
- a processing unit that controls the inverter circuit so as to provide the operation state according to the setting by the setting unit;
- and
- the setting unit sets the command value so that a load angle which is an angle between the rotor axis and motor applied voltage may be positioned on the smaller side than the load angle for providing the maximum output torque in the characteristic of load angle and output torque.
6 more elements
A motor control apparatus comprising:
- an inverter circuit that supplies driving power to a motor,
- a motor current detector that detects the current flowing in the motor, and
- an inverter controller that controls the inverter circuit on the basis of the output from the motor current detector,
- wherein
- the inverter controller includes:
- a setting unit that sets various command values for controlling the operation state of the motor;
- and
- a processing unit that controls the inverter circuit so as to provide the operation state according to the setting by the setting unit;
- and
- the setting unit sets the command value so that a load angle which is an angle between the rotor axis and motor applied voltage may be positioned on the smaller side than the load angle for providing the maximum output torque in the characteristic of load angle and output torque and
- wherein
- the inverter controller further includes a load amount detecting unit that detects the load amount of the motor, the load amount detecting unit detects the load amount by detecting any one of active current, phase difference Φ between applied voltage and motor current, phase difference a between motor applied voltage and motor induced voltage and phase difference β between q-axis of rotor axis and motor current, and the setting unit sets the operation state of the motor on the basis of the load amount obtained from the load amount detecting unit.
9 more elements
A motor control apparatus comprising:
- an inverter circuit that supplies driving power to a motor,
- a motor current detector that detects the current flowing in the motor, and
- an inverter controller that controls the inverter circuit on the basis of the output from the motor current detector,
- wherein
- the inverter controller includes:
- a setting unit that sets various command values for controlling the operation state of the motor;
- and
- a processing unit that controls the inverter circuit so as to provide the operation state according to the setting by the setting unit;
- and
- the setting unit sets the command value so that a load angle which is an angle between the rotor axis and motor applied voltage may be positioned on the smaller side than the load angle for providing the maximum output torque in the characteristic of load angle and output torque and
- wherein
- the setting unit controls the load angle according to command for commanding reactive current component in motor current, command for commanding phase difference Φ between applied voltage and motor current, command for commanding phase difference a between applied voltage and motor induced voltage, or command for commanding phase difference β between q-axis of rotor axis and motor current.
9 more elements
A motor control apparatus comprising:
- an inverter circuit that supplies driving power to a motor,
- a motor current detector that detects the current flowing in the motor, and
- an inverter controller that controls the inverter circuit on the basis of the output from the motor current detecting unit, wherein the inverter controller includes a load amount detecting unit that detects a load amount,
- wherein the load amount detecting unit:
- determines active current component of the motor current, and calculates a change amount from an active current component of the motor current that is obtained in the previous cycle, and
- compares the change amount with a predetermined value, and when the change amount is smaller than the predetermined value, increases gradually a reactive current component of the motor current until the change amount of the active current component of the motor current exceeds the predetermined value, or when the change amount is more than or equal to the predetermined value, judges the load amount on the basis of the reactive current component of the motor current at this time.
3 more elements
Dependencies are inferred from the claim text.