Control device, winding switching system, control method, and control program

A control device for controlling an AC motor capable of switching a connection state of a plurality of windings from a first connection state to a second connection state, comprising:

• a specifying unit configured to specify a switching timing at which zero crossing switching for switching the connection state of the plurality of windings of the AC motor from the first connection state to the second connection state at a zero crossing point of current flowing through the windings is executed;
• and
• a control value switching unit configured to switch a control voltage value, which is a voltage value to be applied to the AC motor from a first control voltage value to be used in the first connection state to a second control voltage value to be used in the second connection state, based on the switching timing specified by the specifying unit.

A control method for controlling an AC motor capable of switching a connection state of a plurality of windings from a first connection state to a second connection state, comprising:

• a step of specifying a switching timing at which zero crossing switching for switching a connection state of the plurality of windings of the AC motor from the first connection state to the second connection state at a zero crossing point of current flowing through the windings is executed;
• and
• a step of switching a control voltage value, which is a voltage value to be applied to the AC motor from a first control voltage value to be used in the first connection state to a second control voltage value to be used in the second connection state based on the specified switching timing.