Control device of rotary electric machine and control method of the same
An object of the invention is to reduce a torque pulsation. A control device of a rotary electric machine according to the invention includes a sinusoidal wave generation circuit which generates a sinusoidal wave signal according to a magnetic pole position of a rotor of the rotary electric machine, a current command circuit which generates a speed command, a torque command based on actual speed information, and a current command on the basis of the sinusoidal wave signal, and a current control circuit which controls an inverter circuit interposed between a stator winding and a DC power source to make a sinusoidal current flow to the stator winding on the basis of the current command and a current detection signal of the stator winding of the rotary electric machine, wherein the current control circuit periodically changes a current phase of the sinusoidal current when the rotary electric machine is driven by a predetermined torque and a predetermined rotation frequency.
1. A control device of a rotary electric machine, comprising:
a sinusoidal wave generation circuit configured to generate a flux sinusoidal wave signal according to a magnetic pole position of a rotor of the rotary electric machine;
a current command circuit configured to generate a speed command, a torque command based on actual speed information, and a current command on the basis of the sinusoidal wave signal; and
a current control circuit configured to control an inverter circuit interposed between a stator winding and a DC power source to make a sinusoidal current flow to the stator winding on the basis of the current command and a current detection signal of the stator winding of the rotary electric machine,
wherein the current control circuit is configured to periodically change a current phase of the sinusoidal current when the rotary electric machine is driven by a predetermined torque and a predetermined rotation frequency such that an output torque is constant,
wherein the current command circuit is configured to generate a speed command to cause a speed to be increased to reduce a torque pulsation, and
wherein the current control circuit is configured to periodically change the current phase by a number of slot combinations of the rotor and the stator of the rotary electric machine during one rotation, the slot combinations based on a least common multiple of a number of the stator slots and rotor poles.
2. The control device of the rotary electric machine according to claim 1 ,
wherein the current control circuit is configured to periodically change the current phase by a number of slots of the stator of the rotary electric machine during one rotation, or by Number of slots of the stator of the rotary electric machine during one rotation/Number of slots at each pole and each phase.
3. The control device of the rotary electric machine according to claim 1 ,
wherein the current control circuit is configured to periodically change the current phase in a constant current value.
4. The control device of the rotary electric machine according to claim 1 ,
wherein, if a current phase to cause a maximum torque is βtmax, a range of periodically changing the current phase β is βtmax≤β.
5. The control device of the rotary electric machine according to claim 1 ,
wherein, if a current phase to cause a maximum torque is βtmax, a range of periodically changing a current phase β is β≤βtmax.
6. The control device of the rotary electric machine according to claim 1 ,
wherein the current control circuit is configured to change the current phase in a period where the torque pulsation is constant, the current phase is constant in a period where the torque pulsation is changed, and the current phase is periodically changed.
7. A control method of a rotary electric machine, comprising:
generating a flux sinusoidal wave signal according to a magnetic pole position of a rotor of the rotary electric machine;
generating a speed command, a torque command based on actual speed information, and a current command on the basis of the sinusoidal wave signal; and
controlling an inverter circuit interposed between a stator winding and a DC power source to make a sinusoidal current flow to the stator winding on the basis of the current command and a current detection signal of the stator winding of the rotary electric machine,
wherein a current phase of the sinusoidal current is periodically changed when the rotary electric machine is driven by a predetermined torque and a predetermined rotation frequency such that an output torque is constant,
wherein a speed command is generated to cause a speed to be increased to reduce a torque pulsation, and
wherein the current phase is periodically changed by a number of slot combinations of the rotor and the stator of the rotary electric machine during one rotation, the slot combinations based on a least common multiple of a number of the stator slots and the rotor poles.