The control device includes: a unit for receiving, for a time period, phase voltage setpoints forming a setpoint vector in vector space; a unit for selecting at least N+I states of the inverter which are associated, respectively, with at least N+I predetermined vectors (MI . . . M27) defining a volume in the vector space (Esp) containing the setpoint vector; a unit for controlling the inverter, over the time period, in order to place it successively in the selected states so that it substantially applies, on average over the time period, the phase voltage setpoints. The at least N+I states of the inverter are selected from among groups of at least N+I states of the inverter, the at least N+I states of the inverter of at least one of the groups being associated, respectively, with at least N+I predetermined vectors (MI . . . M27), at least N of which are formed by predetermined zero-sum phase voltages and at least one of which is formed by predetermined nonzero-sum phase voltages.

The invention relates to a method for switching off a multi-phase electric machine (110) in a motor vehicle, the multi-phase electric machine (110) comprising a rotor having a rotor winding (101) and a stator having a multi-phase stator winding (110a), wherein in a block mode (210) of the electric machine (110) a parameter influencing a synchronous generated voltage vector (U.sub.p) of a synchronous generated voltage is adjusted such that the synchronous generated voltage reaches a first threshold value (S.sub.1), wherein the block mode (210) is deactivated when the first threshold value (S.sub.1) is reached and a PWM mode (220) for applying a phase voltage with a phase voltage vector (U.sub.s) is activated, wherein the phase voltage vector (U.sub.s) and the synchronous generated voltage vector (U.sub.p) are varied in PWM mode (220) until the parameter influencing the synchronous generated voltage reaches a further threshold value (S.sub.2), wherein the phase voltage is switched off when the further threshold value (S.sub.2) is reached. Furthermore, the invention relates to a computing unit (112) configured to carry out the method.

The invention relates to a method for switching off a multi-phase electric machine (110) in a motor vehicle, the multi-phase electric machine (110) comprising a rotor having a rotor winding (101) and a stator having a multi-phase stator winding (110a), wherein in a block mode (210) of the electric machine (110) a parameter influencing a synchronous generated voltage vector (U.sub.p) of a synchronous generated voltage is adjusted such that the synchronous generated voltage reaches a first threshold value (S.sub.1), wherein the block mode (210) is deactivated when the first threshold value (S.sub.1) is reached and a PWM mode (220) for applying a phase voltage with a phase voltage vector (U.sub.s) is activated, wherein the phase voltage vector (U.sub.s) and the synchronous generated voltage vector (U.sub.p) are varied in PWM mode (220) until the parameter influencing the synchronous generated voltage reaches a further threshold value (S.sub.2), wherein the phase voltage is switched off when the further threshold value (S.sub.2) is reached. Furthermore, the invention relates to a computing unit (112) configured to carry out the method.

A motor controlling method includes a step of obtaining an armature magnetic flux, a resultant magnetic flux, a stator current, and a stator voltage, which are represented by a phasor, with respect to an - fixed coordinate system or a d-q rotating coordinate system, a step of calculating an angle () between the stator current and the stator voltage, a step of calculating a torque angle () according to:

=cos.sup.1[(.sub.m.sub.s.sub.mLI.sub.s sin())/(.sub.s.sup.2+(LI.sub.s).sup.22LI.sub.ssin())],

where L is an armature inductance, .sub.m indicates a magnetic flux of a rotor magnet, .sub.s indicates a magnitude of the resultant magnetic flux, and I.sub.s indicates a magnitude of the stator current, and a step of controlling the surface permanent magnet motor based on the torque angle ().

A motor controlling method includes a step of obtaining an armature magnetic flux, a resultant magnetic flux, a stator current, and a stator voltage, which are represented by a phasor, with respect to an - fixed coordinate system or a d-q rotating coordinate system, a step of calculating an angle () between the stator current and the stator voltage, a step of calculating a torque angle () according to:

=cos.sup.1[(.sub.m.sub.s.sub.mLI.sub.s sin())/(.sub.s.sup.2+(LI.sub.s).sup.22LI.sub.ssin())],

where L is an armature inductance, .sub.m indicates a magnetic flux of a rotor magnet, .sub.s indicates a magnitude of the resultant magnetic flux, and I.sub.s indicates a magnitude of the stator current, and a step of controlling the surface permanent magnet motor based on the torque angle ().

A power converting apparatus includes a converter, a smoothing unit, inverters, and a control unit. The inverters are connected to the converter, the inverters being in parallel connection with each other. The inverter converts power output from the smoothing unit into a first alternating-current power, and outputs the first alternating-current power to a device in which a motor is installed. The inverter converts power outputted from the smoothing unit into a second alternating-current power, and outputs the second alternating-current power to a device in which a motor is installed. The control unit controls an operation of the converter and the inverters to reduce a current flowing in the smoothing unit and concurrently controls an operation of the inverter in accordance with an operation state of the inverter and a load unit including the device.

A power converting apparatus includes a converter, a smoothing unit, inverters, and a control unit. The inverters are connected to the converter, the inverters being in parallel connection with each other. The inverter converts power output from the smoothing unit into a first alternating-current power, and outputs the first alternating-current power to a device in which a motor is installed. The inverter converts power outputted from the smoothing unit into a second alternating-current power, and outputs the second alternating-current power to a device in which a motor is installed. The control unit controls an operation of the converter and the inverters to reduce a current flowing in the smoothing unit and concurrently controls an operation of the inverter in accordance with an operation state of the inverter and a load unit including the device.

Disclosed are a bus current control method, a device, a system and a storage medium. The method includes: obtaining a data set including a motor speed corresponding to a current time point, an actual current and an actual torque; determining a limit current at the current time point according to the motor speed; in response to the limit current being less than the actual current, determining a deviation value at the current time point according to the limit current and the actual current; determining a target requested torque based on the deviation value and the actual torque; and determining the bus current according to the target requested torque.

Disclosed are a bus current control method, a device, a system and a storage medium. The method includes: obtaining a data set including a motor speed corresponding to a current time point, an actual current and an actual torque; determining a limit current at the current time point according to the motor speed; in response to the limit current being less than the actual current, determining a deviation value at the current time point according to the limit current and the actual current; determining a target requested torque based on the deviation value and the actual torque; and determining the bus current according to the target requested torque.

A rotary electric machine is equipped with a stator and a rotor. The rotor has a d-axis magnetic circuit that is produced by a magnetomotive force of a field winding, and magnet magnetic circuits that are produced by a magnetic force of permanent magnets. The d-axis magnetic circuit and a q-axis magnetic circuit have at least a part thereof that is common to both. The permeance of the d-axis magnetic circuit is smaller than the permeance of the q-axis magnetic circuit, when a load is being applied to the rotor. A control apparatus of the rotary electric machine has a switching circuit that controls the field current in the field winding, and a control section that makes the switching frequency of the switching circuit become higher when the field current is above a threshold value than when the field current is less than or equal to the threshold value.