Motor drive apparatus, refrigeration cycle apparatus, air conditioner, water heater, and refrigerator

A motor drive apparatus comprising:

• connection switching circuitry including a switch, and to switch a connection state of a winding of a first motor through switching operation of the switch during rotation operation of the first motor, the first motor being a drive source for a compressor;
• an inverter to apply an alternating-current voltage to the winding via the switch;
• a first controller to control the inverter and the connection switching circuitry;
• and
• a second controller to control a second motor, the second motor being a drive source for a blower that is an element that affects a load on the first motor, wherein
• control that the first controller performs when switching the connection state includes a first stage of bringing an effective value of alternating current that is to flow through the winding close to zero compared to an effective value of alternating current that has flowed through the winding before the connection state is switched and a second stage of suspending output of the alternating-current voltage from the inverter,
• the second controller keeps the second motor running by an inertia rotation or a powered rotation during a period including the first stage and the second stage, and
• the first controller causes the switch to perform the switching operation in the second stage.