The present disclosure is directed to a permanent magnet motor control method and system. A new structure configuration of a permanent magnet motor has a rotor with two or more permanent magnets attached thereon, a stator wound in a Y topology with three coils (windings) arranged at 120 degree among one another, and a neutral point of the wound stator wired in a manner that the voltage at the neutral point may be detected in substantially real time. The detected neutral point voltages are analyzed together with the associated vectors of the excitation current provided to the windings of the stator to determine a speed of the rotor. The determined speed of the rotor is used for vector control.

A control apparatus is provided for controlling energization of a multiple-winding rotating electric machine. The control apparatus includes inverters respectively corresponding to winding sets of the machine and a controller. The unit of a group of components provided for the energization of one winding set is defined as a system. The controller is configured to: (1) offset switching timings of switch elements of each of the inverters from those of switch elements of any other of the inverters; and (2) determine switching patterns of systems, based on an evaluation function of common-mode voltages of the systems, so as to minimize electro-magnetic interference due to the common-mode voltages. In each of the systems, the common-mode voltage of the system is defined as the difference in electric potential between a neutral point in voltage of a DC power source and a neutral point of the winding set corresponding to the system.

A drive system has an electric motor, wherein the electric motor includes a first three-phase stator winding system and a second three-phase stator winding system. The first and the second stator winding system are arranged on the stator in a manner rotated through an electrical phase angle in relation to one another. The drive system includes a frequency converter, wherein the frequency converter has a first bridge circuit arrangement which is designed to generate voltages for the first winding system and a second bridge circuit arrangement which is designed to generate voltages for the second winding system. The first bridge circuit arrangement and the second bridge circuit arrangement are connected in series. A control device is designed to actuate the first bridge circuit arrangement and the second bridge circuit arrangement.

This power output device is provided with: a field winding; a motor having a plurality of star-connected motor windings composed of three or more phases; a capacitor; an inverter circuit configured to perform power conversion on the power supplied from the capacitor and to supply the converted power to the motor windings; a battery connected to the field winding; and a control unit. The inverter circuit has a plurality of switching element pairs that correspond to the respective motor windings. The capacitor is connected to a positive bus bar and a negative bus bar. The field winding is connected to the positive or negative bus bar and to a neutral point of the motor. The control unit is configured to control the switching element pairs so as to charge the capacitor by boosting the voltage of the battery and to supply a direct current to the field winding.

A motor device includes a first stator connected to a first inverter and a second stator connected to a second inverter. A motor controller controls a supply of first three-phase currents from the first inverter to the first stator, and controls a supply of second three-phase currents from the second inverter to the second stator. Each of the first three-phase currents has a same-phase first compensation current superposed thereon, and each of the second three-phase currents has a same-phase second compensation current superposed thereon. The second compensation current has the same phase as the first compensation current and is reversely polarized relative to the first compensation current.

An electrical motor device according to the present invention is provided with a control unit. The control unit is configured to adjust the ratio of transformation by adjusting the ratio between a first time period, in which all upper-arm-side switching elements are on and all lower-arm-side switching element are off, and a second time period, in which all upper-arm-side switching elements are off and all lower-arm-side switching elements are on, and to select one of a plurality of driving modes for each control cycle. The plurality of driving modes include: a dual-driving mode including the first time period and the second time period in one control cycle during electrical motor driving; and an electrical motor driving mode not including the first time period and the second time period in one control cycle during electrical motor driving.

A power conversion device according to an embodiment of the present invention includes a first inverter to which one end of each of n phase windings (n is an integer of three or more) included in an electric motor is coupled, a second inverter to which the other end of each phase winding is coupled, and a switch circuit having at least one of: a first switch element that switches between connection and disconnection of the first inverter and ground, and a second switch element that switches between connection and disconnection of the second inverter and ground.

This patent presents a multidimensional space vector modulation (MDSVM) circuit formed by coupling a half-bridge logic control circuit not directly coupled to electronic components with at least three half-bridge logic control circuits coupled to electronic components. The half-bridge logic control circuit not directly coupled with any electronic components can form a full-bridge circuit with any other half-bridge logic control circuit coupled with electronic components. Therefore, users can further control the voltage difference between both ends of each electronic component separately and then individually control the strength and direction of current flowing through each electronic component and solving the problem of control attributed to the complexity of prior art.

A control device for an inverter has a first inverter terminal, a second inverter terminal and a plurality of bridge branches, which bridge branches each comprise a first semiconductor, a winding terminal and a second semiconductor switch. The winding terminals are connected to a winding arrangement. The control device is configured to output a control signal which enables a first bridge branch state and a second bridge branch state in the case of at least two of the bridge branches in a first operating state, wherein, in the first bridge branch state, the second semiconductor switch assigned to the bridge branch is switched on, and wherein, in the second bridge branch state, the second semiconductor switch assigned to the bridge branch is switched off. At least two of the bridge branches are occasionally simultaneously in the first bridge branch state, and a change of said at least two bridge branches into the second bridge branch state is subsequently carried out at different points in time.

A power conversion device may include a first inverter to which one end of each phase winding of a motor is coupled, a second inverter to which the other end of each phase winding is coupled, and a switch circuit having at least one of a first switch element that switches between connection and disconnection of the first inverter to and from a ground, a first protection circuit being coupled in parallel to the first switch element, and a second switch element that switches between connection and disconnection of the second inverter to and from the ground, a second protection circuit being coupled in parallel to the second switch element.