A rotor having rotation salient poles, a stator having fixed salient poles with a plurality of field winding sets, K control signal output sections outputting signals by detecting a plurality of sections to be formed on a cylindrical body or a disk pivoted to the rotor by a plurality of sensors installed to correspond to the fixed salient poles with the plurality of sections to be detected are opposed to a track formed in a circumferential direction, and a power-feeding control section having control circuits operating according to control signals, controlling directions and intensities of excitation currents, where the rotation salient poles are opposed to at least two salient poles, and the excitation currents are controlled with magnetic fields in the same direction occur in rotation salient poles of the salient poles advanced by at least one and magnetic fields disappear in rotation salient poles.

A rotor having rotation salient poles, a stator having fixed salient poles with a plurality of field winding sets, K control signal output sections outputting signals by detecting a plurality of sections to be formed on a cylindrical body or a disk pivoted to the rotor by a plurality of sensors installed to correspond to the fixed salient poles with the plurality of sections to be detected are opposed to a track formed in a circumferential direction, and a power-feeding control section having control circuits operating according to control signals, controlling directions and intensities of excitation currents, where the rotation salient poles are opposed to at least two salient poles, and the excitation currents are controlled with magnetic fields in the same direction occur in rotation salient poles of the salient poles advanced by at least one and magnetic fields disappear in rotation salient poles.

An apparatus includes a switch module that selectively turns on a switch to connect an input power conductor connected to a voltage source to a motor in a sequence. The switch for each phase is turned on for a portion of a cycle of a fundamental frequency of the voltage source. A source phase module determines a phase of the AC voltage source, a back-EMF phase module determines a phase of a back-EMF of the motor, and a torque module determines when a phase difference between the phase of the AC voltage source and the phase of the back-EMF is within a phase range indicative of a positive motor torque. A pulse module enables the switches in response to the phase difference having a phase within the phase range and disables the switches in response to the phase difference having a phase not in the phase range.

A rotor having rotation salient poles, a stator having fixed salient poles with a plurality of field winding sets, K control signal output sections outputting signals by detecting a plurality of sections to be formed on a cylindrical body or a disk pivoted to the rotor by a plurality of sensors installed to correspond to the fixed salient poles with the plurality of sections to be detected are opposed to a track formed in a circumferential direction, and a power-feeding control section having control circuits operating according to control signals, controlling directions and intensities of excitation currents, where the rotation salient poles are opposed to at least two salient poles, and the excitation currents are controlled with magnetic fields in the same direction occur in rotation salient poles of the salient poles advanced by at least one and magnetic fields disappear in rotation salient poles.

A rotor having rotation salient poles, a stator having fixed salient poles with a plurality of field winding sets, K control signal output sections outputting signals by detecting a plurality of sections to be formed on a cylindrical body or a disk pivoted to the rotor by a plurality of sensors installed to correspond to the fixed salient poles with the plurality of sections to be detected are opposed to a track formed in a circumferential direction, and a power-feeding control section having control circuits operating according to control signals, controlling directions and intensities of excitation currents, where the rotation salient poles are opposed to at least two salient poles, and the excitation currents are controlled with magnetic fields in the same direction occur in rotation salient poles of the salient poles advanced by at least one and magnetic fields disappear in rotation salient poles.

A power tool, in particular a handheld power tool, for example a grinding machine, that includes a tool, an electric motor for driving the tool, and a control unit for actuating the electric motor using a motor current (MI). The control unit has a start-up mode in which the control unit actuates the electric motor in such a way that the electric motor during the start-up mode traverses a rotational speed ramp (DR), at which the rotational speed of the electric motor is increased continuously up to operating rotational speed (ADZ) The control unit is designed to adjust the gradient of the rotational speed ramp (DR) on the basis of an acquired temperature for the start-up mode and/or to adjust the intensity of the motor current (MI) on the basis of the acquired temperature for the start-up mode.

A method and system is provided for determining a direction of movement of an electric vehicle. The method and system includes determining the direction of rotation and the direction of torque of a motor shaft, determining an operating gear of the vehicle, and determining a previous direction of movement of the vehicle. The method and system then determines if the vehicle is moving forward or backwards. The method and system also determines whether the vehicle is motoring (i.e., converting electric power to mechanical power) or generating (i.e., converting mechanical power into electric power).

A method and system is provided for determining a direction of movement of an electric vehicle. The method and system includes determining the direction of rotation and the direction of torque of a motor shaft, determining an operating gear of the vehicle, and determining a previous direction of movement of the vehicle. The method and system then determines if the vehicle is moving forward or backwards. The method and system also determines whether the vehicle is motoring (i.e., converting electric power to mechanical power) or generating (i.e., converting mechanical power into electric power).

A planetary magnetic motor and a method of use thereof is disclosed. The planetary magnetic motor may have a stator and one or more planetary rotor systems. The stator may have a shell body with a plurality of winding sets distributed along the inner surface of such shell body. The planetary rotor system may have a sun gear with an output shaft, a plurality of planet gears coupled around the sun gear, and an outer ring gear. Each planet gear may have a permanent magnet attached where the permanent magnet extends inside the shell body of the stator and is proximate and faces the winding sets. An alternating current may be fed to the winding sets that create alternating magnetic fields that interact with the permanent magnets to rotate the planet gears and the planetary rotor system, in general.

A planetary magnetic motor and a method of use thereof is disclosed. The planetary magnetic motor may have a stator and one or more planetary rotor systems. The stator may have a shell body with a plurality of winding sets distributed along the inner surface of such shell body. The planetary rotor system may have a sun gear with an output shaft, a plurality of planet gears coupled around the sun gear, and an outer ring gear. Each planet gear may have a permanent magnet attached where the permanent magnet extends inside the shell body of the stator and is proximate and faces the winding sets. An alternating current may be fed to the winding sets that create alternating magnetic fields that interact with the permanent magnets to rotate the planet gears and the planetary rotor system, in general.