Abstract: A switched mode power supply including an alternating current power supply configured to output a voltage, a sense resistor configured to sense a voltage output from the power supply, a current sense processor configured to sense a current level through the sense resistor, sense disturbances in the sensed voltage, and reconstruct the sensed voltage to eliminate the disturbances.

Abstract: A drive system has an electric motor having a shaft; an electronic assembly; and a fan driven by way of the shaft, the electronic assembly being rigidly and thermally coupled to the fan.

Abstract: An apparatus having a self-contained hydraulic power module in operable communication with the apparatus, the module capable of being readily connected and disconnected to the apparatus for ready installation and/or replacement of the module as desired.

Abstract: A winding synchronous machine having a moving object including an inverter circuit comprises: a moving-object inverter circuit connected to the moving object of the winding synchronous machine; and a moving-object circuit control device connected to the moving-object inverter circuit so as to control the moving-object inverter circuit. The moving-object circuit control device may comprise: a stator inverter voltage estimator estimating a high-frequency voltage of a stator inverter circuit; a field current reference generator generating a field current reference of the moving object; and an energy storage device voltage controller generating a current reference tracking a DC-link energy storage device voltage of the moving object. Problems associated with using a rare-earth permanent magnet can be thereby overcome, and a winding synchronous machine including an excitation circuit in which ripples almost never occur can be implemented without using an extra power source.

Abstract: Embodiments of the invention comprise a multi-input range box driven by multiple electric drives. Range shifting involves momentarily increasing the current through all but a given motor, to a level that will carry the entire load, comprising specified constant power. Simultaneously, torque of the given motor is reduced to zero. The given motor is then disconnected from supplying power, is synchronized to the input speed of the new speed range, and is then engaged for the new range. The above sequence is then repeated for each remaining motors, in turn. The motor current is re-equalized for all of the motors, after all the motors have been connected to provide power at the new range. Thus, there is no interruption in power flow during a range shift, and the motors are always used to deliver power, rather than to serve as a brake.

Abstract: A pulse width modulation (PWM) Frequency Adaptation Mechanism (PFAM) is configured to receive vehicle state input, and in response to the vehicle state input, provide a PWM parameter for PWM switching of electronics in a power conversion circuit of an electric drive system (EDS) for a hybrid electric vehicle. In one example, a PWM parameter that reduces the audible noise generated by PWM switching can be designated by the PFAM. A PFAM can be configured to receive user input regarding user preference for a default mode or a noise reduction mode. Vehicle state input can include input related to vehicle motion, climate control system state, engine state, EDS state, vehicle body state and audio system state. By way of example, a PWM noise reduction parameter can comprise a high PWM switching frequency, or a random frequency hopping about a low PWM switching frequency.

Abstract: Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a vector controlled motor drive system when the multi-phase machine operates in an overmodulation region. The disclosed embodiments provide a mechanism for adjusting a duty cycle of PWM waveforms so that the correct phase voltage command signals are applied at the angle transitions. This can reduce variations/errors in the phase voltage command signals applied to the multi-phase machine so that phase current may be properly regulated thus reducing current/torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source.

Abstract: A drive system for a three phase brushless AC motor is arranged to optimize the transistor switching pattern to improve power output whilst allowing current measurement in all of the phases using a single sensor. This is achieved by defining voltage demand vectors x where more than two states are required to meet a minimum state time requirement determined by the single sensor method, and calculating three or more state vectors which produce the demanded vector x whilst still allowing single current sensing. Various methods of optimising the PWM pattern so as to give maximum output whilst using single current sensing are also disclosed.

Abstract: In a fan motor drive circuit which drives a motor based on a pulse-modulated external control signal, a temperature control signal generator generates a pulse-modulated temperature control signal whose duty ratio changes depending on temperature. A signal synthesizer synthesizes the external control signal and the temperature control signal by a logical operation. A drive controller drives the motor based on output of the signal synthesizer.

Abstract: A drive method for a brushless motor and a drive control apparatus therefor, in which control parameters are calculated by revolution number control means or motor current control means in accordance with the deviation between a target value and an actual value, a manipulated variable is computed by conduction phase control means on the basis of the calculated control parameters, an advance angle magnitude is computed from the relationship between a manipulated variable and an advance angle magnitude as designed and created beforehand, on the basis of the computed manipulated variable, and the value of a conduction phase angle of a drive circuit as designed on the basis of a rotation position signal or a motor current signal is corrected using the information of the computed advance angle magnitude.

Abstract: The methods serves for activating an electric motor of a metering pump with which the fluid quantity (Vnom) to be delivered is set by an external impulse trigger, wherein a predetermined delivery quantity (Vnom) is allocated to each impulse (t). The control detects the temporal interval (?t) of the two last-received impulses and activates the electric motor such that the fluid quantity to be delivered, taking the previously evaluated interval as a basis, is distributed over the subsequent impulse interval.

Abstract: A controller is provided for transitioning a drive signal to a single phase motor between a square wave and pulse width modulation modes, wherein the drive signal is in square wave mode at low motor frequencies and in pulse width modulation mode during normal operation. The transitioning includes using a real time motor model to effectuate transition of the drive signal between the modes, and a sampling rate for sampling the real time motor model during the transitioning. The sampling rate is automatically modified during the transitioning, wherein acceleration of the motor includes transitioning the drive signal from square wave mode to pulse width modulation mode, including periodically increasing the sampling rate during the transitioning. Conversely, when transitioning from pulse width modulation mode to square wave mode, the controller automatically deaccelerates the sampling rate during the transitioning.

Abstract: An apparatus and method for automatic leveling of elevator cars by controlled DC plugging of AC induction motors. The invention utilizes, in a novel circuit and control arrangement, the external neutral connection of a Y-wound motor design to inject controlled direct current into the neutral to dynamically control the braking to a stop. The elevator car is thus more safely and accurately leveled at the desired floor than has heretofore been known in the art. A novel speed control method is also disclosed which compares and sums positive and negative DC signals and which switches to the motor braking mode at a desired time.

Abstract: A control system for controlling the load of an AC motor/generator of secondary AC excitation type connected to a power system in parallel to at least a synchronous machine. The AC motor/generator has the secondary excitation winding thereof controlled in the amount of excitation so as to generate an output in accordance with an external output command. In the case of variation of power flow between the power system and the synchronous machine, the output command is corrected in accordance with the variation, and the amount of the secondary excitation is controlled by the corrected output command, whereby the variation of power flow between the power system and the synchronous machine is absorbed by the AC motor/generator thereby to prevent the synchronous machine from stepping out.