Six-wire three-phase motor, inverter device, and motor system
A six-wire three-phase motor that can realize both of increasing an output and reducing a torque ripple is provided. A six-wire three-phase motor is a six-wire three-phase motor including: a stator including a winding wire wound independently between phases; and a rotor including a plurality of magnets in a circumferential direction, wherein the stator or the rotor is configured in such a manner that a third harmonic current component in a motor current of when an overmodulation voltage based on a PWM signal is applied becomes higher than a third harmonic current component in a motor current of when a sinusoidal modulation voltage based on the PWM signal is applied.
1. A six-wire three-phase motor comprising:
a stator including a winding wire wound independently between phases; and
a rotor including a plurality of magnets in a circumferential direction,
wherein the stator or the rotor is configured in such a manner that a third harmonic current component in a motor current of when an overmodulation voltage based on a PWM signal is applied becomes higher than a third harmonic current component in a motor current of when a sinusoidal modulation voltage based on the PWM signal is applied, and
wherein the winding wire is arranged in the stator with a pitch of ⅔ of a magnetic pole pitch.
2. The six-wire three-phase motor according to claim 1 ,
wherein an induced voltage generated in the winding wire due to the magnets includes no third harmonic component.
3. The six-wire three-phase motor according to claim 2 ,
wherein the winding wire is arranged in the stator such that no third harmonic component is included in the induced voltage generated due to the magnets.
4. The six-wire three-phase motor according to claim 3 ,
wherein the stator is a two-pole three-slot concentrated winding stator or four-pole three-slot concentrated winding stator.
5. The six-wire three-phase motor according to claim 2 ,
wherein a pole-arc ratio of the magnets is ⅔.
6. An inverter device that applies an inverter applied voltage by PWM control based on a carrier wave and a signal wave to the six-wire three-phase motor according to claim 1 ,
wherein the signal wave includes a fundamental wave having amplitude higher than amplitude of the carrier wave and a third harmonic signal and has amplitude equal to or lower than the amplitude of the carrier wave.
7. A motor system comprising:
the six-wire three-phase motor according to claim 1 ; and
an inverter device that applies an inverter applied voltage by PWM control based on a carrier wave and a signal wave to the six-wire three-phase motor,
wherein the signal wave includes a fundamental wave having amplitude higher than amplitude of the carrier wave and a third harmonic signal and has amplitude equal to or lower than the amplitude of the carrier wave.