Abstract: Starting from the known rotating electromechanical converter comprising a stator with magnetic circuits and polyphase energizing windings, a first, inner, rotor with magnetic circuits and polyphase energizing windings, and a second (inter)rotor between this first rotor and the stator, provided with permanent magnetic members for co-operation with the magnetic circuit of at least the stator, the invention proposes to provide means for modifying the state of magnetization of at least a part of the respective areas of the second rotor which each lie between two successive permanent magnetic members.

Abstract: A system for controlling a brushless motor includes drive circuitry in communication with the brushless motor and a primary control device in communication with the drive circuitry. The system also includes a secondary control device in communication with the drive circuitry and a multiplexer for selectively providing an output of the primary control device or an output of the secondary control device to the drive circuitry, wherein the output of the primary control device is provided to the drive circuitry when the primary control device is operating normally.

Abstract: Starting from the known rotating electromechanical converter comprising a stator with magnetic circuits and polyphase energising windings, a first, inner, rotor with magnetic circuits and polyphase energising windings, and a second (inter)rotor between this first rotor and the stator, provided with permanent magnetic members for co-operation with the magnetic circuit of at least the stator, the invention proposes to provide means for modifying the state of magnetisation of at least a part of the respective areas of the second rotor which each lie between two successive permanent magnetic members.

Abstract: A method of propelling a mobile machine is disclosed. The mobile machine may have a plurality of DC traction motors, including a first DC traction motor and a second DC traction motor. The method may include driving a first traction device with the first DC traction motor, the first DC traction motor including a first field coil and a first armature electrically connected in series. The method may also include driving a second DC traction device with the second DC traction motor electrically connected in series with the first DC traction motor, the second DC traction motor including a second field coil and a second armature electrically connected in series. Additionally, the method may include, in response to slippage of the first traction device, bypassing at least a portion of electric current flowing through the first field coil around the first armature. The method may also include directing at least a portion of the bypassed electric current through the second field coil and the second armature.

Abstract: An object of the present invention is to provide a generator control unit having improved voltage response in a system which is not provided with a battery in a DC output unit. In order to control the DC voltage of the DC voltage output terminal in a state where an electric load is connected to the DC voltage output terminal of a power generation unit, a PWM signal generation unit 429 generates a field voltage to be applied to a field winding terminal of the power generation unit. A feedback control unit 422 calculates a field voltage command value to be given to the PWM signal generation unit 429. Further, the feedback control unit 422 includes a PT control unit 423 which calculates a voltage deviation between a DC voltage detection value and a DC voltage command value to generate the field voltage command value through a PI operation based on the voltage deviation.

Abstract: A positioning system and method for focusing a charge coupled device (CCD) lens on a selected surface of an object to be measured is provided. The positioning system and method moves the CCD lens downwards to approximate an estimate Z-axis coordinate of the CCD lens, and moves the CCD lens upwards to find an accurate Z-axis coordinate of the CCD lens according to the selected surface of the object. The system and method further moves the CCD lens to a position corresponding to the accurate Z-axis coordinate to focus the CCD lens on the selected surface.

Abstract: A wheel slip correction system for an electric traction motor propelled vehicle having a plurality of DC electric traction motors with series connected armature and field windings incorporates an apparatus connected in circuit with each motor for reducing motor armature current in response to a motor speed increase caused by wheel slip. The apparatus is arranged to be non-power dissipative during non-wheel slip conditions.

Abstract: Balanced-drive multiple motors each including an armature rotatably actuated by a field winding. Cross-coupled series excitation of the field windings is accomplished by electrically connecting the field winding of each motor in series with the armature of another motor, thereby balancing the rotational speed of all the motors when unequal loads are applied. A means for adjusting the proportionate speed of the motors is also disclosed.

Abstract: A drive system with slip control for railway vehicles with two or more dc drive motors and with common control of the motor armature currents and a logic unit to which are input a measured signal which indicates the armature current intensity of the motor driving the axle having the best adhesion which is usually the trailing axle motor. The measured signal and an amplification signal are multiplied by each other and the product signal issued in a feedback loadsharing system to control the other motors such that the torque of the other motors increased to a maximum allowed level, the trailing axle then rolling very close to ground speed without slipping. This speed is used as a measure of the true speed, which in turn controls the system for loadsharing such that the vehicle can be controlled to maximum tractive effort without causing slipping axles.

Abstract: A microcomputer for use with a direct current machine drive system processes machine drive system currents and voltages to compute real time machine efficiency. From real time machine efficiency, the microcomputer determines optimum, that is to say, desired machine armature current and optimum machine air gap flux. Machine armature current and field current are regulated, respectively, by controlling machine armature voltage responsive to the difference in magnitude between optimum armature current and actual armature current, and by controlling machine field voltage responsive to the difference in magnitude between optimum machine air gap flux and actual machine armature flux, respectively, to assure machine operation at maximum efficiency irrespective of machine load conditions.

Abstract: This disclosure relates to a parallel speed regulator system for a plurality of d.c. motors operated on a common bus having a single armature electrical supply. The speed control, current limiting, and field current controllers for each motor are arranged in parallel and connected to a resistor-diode switching network to provide a switching order of priority: (1) maximum and minimum field current controllers (2) armature current limit controllers and (3) speed controller. This parallel speed regulator system provides all the inherent advantages of the multiloop controller arrangement together with automatic adjustments which are a function of the instantaneous motor operating point, so that the dynamic response of the motor remains the same regardless of perturbations in the operating points.

Abstract: An electrical propulsion control system for self-propelled traction vehicles having an electric generator supplying energy to separately excited traction motors, each motor field being normally excited with a substantially constant field excitation providing magnetic saturation such that motor load variations produce minimal changes in back emf, and means for equally boosting the excitation of each motor field responsive to the largest one of the individual motor armature currents exceeding a predetermined magnitude which is greater than the maximum attainable armature current during dynamic retarding operation.