Patent ID: 11971200
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  H  Y | IPC F

Claim 0:
1. A heat pump apparatus comprising:
a compressor including a compression mechanism and a motor, the compression mechanism compressing a refrigerant, the motor including a rotor and driving the compression mechanism;
a heat exchanger;
an inverter that applies a desired voltage to the motor;
a current detection unit that detects current flowing from the inverter to the motor;
a drive-signal generation unit that generates a drive signal for the inverter;
a magnetic-pole position estimation unit that changes a voltage phase of a voltage command value for a high-frequency voltage, and estimates a magnetic-pole position indicating a stop position of the rotor from a current value to estimate a maximum-heat-amount acquisition magnetic-pole position when the drive-signal generation unit applies the high-frequency voltage to the motor to heat the compressor, the motor being not capable of being rotatably driven with the high-frequency voltage, the high-frequency voltage being represented by a sine wave, the current value being a value of current detected by the current detection unit, a maximum amount of heat being acquired at the maximum-heat-amount acquisition magnetic-pole position;
a steady heating control unit that determines an amplitude and voltage phase of the voltage command value from the maximum-heat-amount acquisition magnetic-pole position and a defined necessary amount of heat when the drive-signal generation unit applies the high-frequency voltage to the motor to heat the compressor; and
a control switching determination unit that generates and outputs a mode switching signal for choosing which one of the magnetic-pole position estimation unit and the steady heating control unit is to operate.