Motor system control device and storage medium

A non-transitory computer-readable storage medium storing a control program configured to be executed by a control device configured to control each of a plurality of switches in an inverter, the control device being applied to a motor system, the motor system comprising:

• a motor having a polyphase windings;
• and an inverter that adjusts a phase-current in a winding of each phase by turning on and off a plurality of switches, each of the switches being a semiconductor switching device,
• wherein the control program is configured to cause the control device to perform:
• a determination process to determine whether there is a heat generation request in the motor system;
• and
• a switch control process to turn on and off the plurality of switches respectively,
• wherein the switch control process includes, when it is determined that there is the heat generation request, causing at least one of:
• (1) a transition time for turning on each of the plurality of switches;
• and (2) a transition time for turning off each of the plurality of switches, to be longer than when it is determined that there is no heat generation request.