A rotary drive system having a voltage source and an electric motor. The motor has a stator with independent phases and a rotor, an inverter designed to connect each phase to the voltage source in order to generate phase currents, and a device for controlling the inverter. The control device includes a unit for determining whether the fundamental frequency of the phase currents is lower than a frequency threshold equal to, at the most, 100 Hz, and a unit for generating a command, configured such that, when the fundamental frequency is determine as being lower than the frequency threshold, the command causes the appearance of a homopolar component in the phase currents.

A rotary drive system having a voltage source and an electric motor. The motor has a stator with independent phases and a rotor, an inverter designed to connect each phase to the voltage source in order to generate phase currents, and a device for controlling the inverter. The control device includes a unit for determining whether the fundamental frequency of the phase currents is lower than a frequency threshold equal to, at the most, 100 Hz, and a unit for generating a command, configured such that, when the fundamental frequency is determine as being lower than the frequency threshold, the command causes the appearance of a homopolar component in the phase currents.

An electric machine assembly includes an electric machine, an inverter configured to provide pulse-width modulation characterized by a switching frequency and a controller. The controller has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method of controlling the switching frequency to minimize a beat frequency phenomenon. Execution of the instructions by the processor causes the controller to obtain a first function (G.sub.1) and a second function (G.sub.2) based at least partially on the original pulse ratio (PR.sub.0). The original pulse ratio (PR.sub.0) is a ratio of the switching frequency and a predefined fundamental frequency. If each of a plurality of conditions are met, a new pulse ratio (PR.sub.N) is determined based at least partially on the original pulse ratio (PR.sub.0), the first function (G.sub.1) and the second function (G.sub.2).

An electric machine assembly includes an electric machine, an inverter configured to provide pulse-width modulation characterized by a switching frequency and a controller. The controller has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method of controlling the switching frequency to minimize a beat frequency phenomenon. Execution of the instructions by the processor causes the controller to obtain a first function (G.sub.1) and a second function (G.sub.2) based at least partially on the original pulse ratio (PR.sub.0). The original pulse ratio (PR.sub.0) is a ratio of the switching frequency and a predefined fundamental frequency. If each of a plurality of conditions are met, a new pulse ratio (PR.sub.N) is determined based at least partially on the original pulse ratio (PR.sub.0), the first function (G.sub.1) and the second function (G.sub.2).

An object of the present invention is to control driving force and braking force of a motor while considering an SOC of a battery. A control device controlling a rotating electric machine including windings of a plurality of independent system. The rotating electric machine is controlled in: a first mode in which an AC current is energized to the windings of the plurality of systems to generate torque such that a combined magnetic field generated in the windings is greater than or equal to a predetermined value; and a second mode in which the AC current having a phase difference different from that in the first mode is energized to the windings of the plurality of systems, the combined magnetic field generated in the windings is made smaller than the predetermined value, and current greater than or equal to that in the first mode flows.

An object of the present invention is to control driving force and braking force of a motor while considering an SOC of a battery. A control device controlling a rotating electric machine including windings of a plurality of independent system. The rotating electric machine is controlled in: a first mode in which an AC current is energized to the windings of the plurality of systems to generate torque such that a combined magnetic field generated in the windings is greater than or equal to a predetermined value; and a second mode in which the AC current having a phase difference different from that in the first mode is energized to the windings of the plurality of systems, the combined magnetic field generated in the windings is made smaller than the predetermined value, and current greater than or equal to that in the first mode flows.

The invention relates to a method for controlling an inverter which is electrically connected to an electric motor, having the following steps: defining a modulated voltage (S1) for the inverter, said voltage being based on a first switching frequency, for operating the electric motor with a current, wherein the current has an electric frequency; determining the electric frequency (S2); changing the first switching frequency (S4) on which the modulated voltage is based to a second switching frequency if a value pair consisting of electric frequency and first switching frequency, or a value pair consisting of electric frequency and a sideband of the first switching frequency, is within at least one defined disturbance range (S3).

The invention relates to a method for controlling an inverter which is electrically connected to an electric motor, having the following steps: defining a modulated voltage (S1) for the inverter, said voltage being based on a first switching frequency, for operating the electric motor with a current, wherein the current has an electric frequency; determining the electric frequency (S2); changing the first switching frequency (S4) on which the modulated voltage is based to a second switching frequency if a value pair consisting of electric frequency and first switching frequency, or a value pair consisting of electric frequency and a sideband of the first switching frequency, is within at least one defined disturbance range (S3).

A motor-integrated inverter is provided. The inverter includes a motor with a shaft disposed in a horizontal direction, and a power module configured to generate driving power for driving the motor and coupled to the motor in a direction in which the shaft is disposed.

A motor-integrated inverter is provided. The inverter includes a motor with a shaft disposed in a horizontal direction, and a power module configured to generate driving power for driving the motor and coupled to the motor in a direction in which the shaft is disposed.