Abstract: A stator for a rotary electric machine. The stator includes: a tubular stator core and a coil including coil segments inserted in slots of the stator core. The coil segments include segment end portions outwardly protruding from an axial end face of the stator core. The coil includes welded portions each of which is constituted by the segment end portions that are welded to each other. The welded portions include a plurality of kinds of welded portions that are different from each other in a welded manner in which the segment end portions are welded to each other, such that the plurality of kinds of welded portions are arranged in circumferential direction of the stator core and/or in a radial direction of the stator core.

Abstract: A vehicle includes a motor, an inverter configured to drive the motor, an electric power storage device connected to the inverter through a power line, and a control device configured to control the inverter. When zero torque control for controlling the inverter such that torque of the motor becomes zero is executed, the control device is configured to control the inverter using a carrier frequency higher than when the zero torque control is not executed.

Abstract: A motor drive system includes a motor for driving a vehicle, an inverter, and an electronic control unit. The electronic control unit is configured to change a carrier frequency as a frequency of a carrier wave, according to operating conditions of the motor. The electronic control unit is configured to set the carrier frequency to a protection frequency when the operating point of the motor lies in a lock region, and the motor is not in an accelerating or decelerating state, and set the carrier frequency to a non-protection frequency higher than the protection frequency, when the operating point lies in the lock region, and the motor is in the accelerating or decelerating state.

Abstract: A motor drive system includes a motor for driving a vehicle, an inverter, and an electronic control unit. The electronic control unit is configured to change a carrier frequency as a frequency of a carrier wave, according to operating conditions of the motor. The electronic control unit is configured to set the carrier frequency to a protection frequency when the operating point of the motor lies in a lock region, and the motor is not in an accelerating or decelerating state, and set the carrier frequency to a non-protection frequency higher than the protection frequency, when the operating point lies in the lock region, and the motor is in the accelerating or decelerating state.

Abstract: In order to lower electromagnetic noise, normally, a carrier frequency of a inverter or controlling drive of a motor mounted on an electrically powered vehicle is changed periodically or randomly within a first frequency range set in advance, as the time elapses. While a vehicle speed is low, the carrier frequency is changed periodically or randomly within a second frequency range set in advance to be wider than the first frequency range and to be equal in central frequency to the first frequency range, as the time elapses. The second frequency range is set to include a resonant frequency of a specific mechanical oscillation system higher in electromagnetic noise generated at a natural resonant frequency, among a plurality of mechanical oscillation systems formed by equipment mounted on the electrically powered vehicle. On the other hand, the first frequency range is set not to include the resonant frequency.

Abstract: In order to lower electromagnetic noise, normally, a carrier frequency of a inverter or controlling drive of a motor mounted on an electrically powered vehicle is changed periodically or randomly within a first frequency range set in advance, as the time elapses. While a vehicle speed is low, the carrier frequency is changed periodically or randomly within a second frequency range set in advance to be wider than the first frequency range and to be equal in central frequency to the first frequency range, as the time elapses. The second frequency range is set to include a resonant frequency of a specific mechanical oscillation system higher in electromagnetic noise generated at a natural resonant frequency, among a plurality of mechanical oscillation systems formed by equipment mounted on the electrically powered vehicle. On the other hand, the first frequency range is set not to include the resonant frequency.