Heat pump apparatus, air conditioner, and refrigeration machine

A heat pump apparatus comprising:

• an inverter comprising a plurality of switching elements and applying a high-frequency voltage to a motor that drives the compressor, the high-frequency voltage having a frequency higher than or equal to an operation frequency of the compressor;
• a processor;
• and
• a memory string a program which, when executed by the processor, performs processes of:
• switching between positive and negative directions of an output voltage output from the inverter every half period of a carrier signal, the carrier signal being used for generating a switching signal, the switching signal controlling whether each of the switching elements is on or off, wherein
• the processor sets, as a phase switching prohibition period, a time period of an integer multiple of two or more times the half period of the carrier signal, and prohibits switching between positive and negative directions of the output voltage in the phase switching prohibition period.