Abstract:
Eine Anordnung mit einem über eine Halbleiteranordnung (34, 35, 36, 37) kommutierten kollektorlosen Gleichstrommotor (19) hat einen über einen Gleichrichter (11) aus einem Wechsel- oder Drehstromnetz speisbaren Gleichstrom-Zwischenkreis (13, 14), an dessen Eingang im Betrieb eine wellige Gleichspannung mit vorgegebenen Maximalwerten liegt. Zwischen dem Gleichrichter (11) und dem kollektorlosen Gleichstrommotor (19) liegt ein Längstransistor (12), welcher als variabler Widerstand betrieben wird. Begrenzungsmittel (25, 27, 28) sind vorgesehen, welche die Spannung am Steuereingang dieses Längstransistors (12) auf einen Wert begrenzen, der kleiner ist als die vorgegebenen Maximalwerte der welligen Gleichspannung, und der im Bereich der Spannungsfestigkeit der Halbleiteranordnung des kollektorlosen Gleichstrommotors (19) liegt.
Abstract:
A power conversion system for converting between electric and motive power may be utilized either in a generating mode to generate electric power from motive power supplied by a prime mover (24) or in a starting mode wherein motive power is developped by the power conversion system from electrical power and is supplied through a torque converter (22) to the prime mover (21) to start same. The power conversion system includes a main generator (20), and exciter (30) and a permanent magnet generator, or PMG (32), which together comprise a brushless alternator (33). When operated in the starting mode, power is supplied to the PMG (32) to cause it to act as a motor and thereby drive a rotor (29) which is common to the PMG (32), exciter (30) and main generator (20). Once a predetermined operating condition of the generator (20) is attained, the main generator (20) is supplied power from a motor control (56) to cause the generator (20) to act as a synchronous motor and the power supply to the PMG (32) is disconnected. The torque converter (22) is then commanded to transfer motive power from the generator (20) to the prime mover (24) to start same.
Abstract:
This disclosure relates to a system for stabilizing a permanent magnet synchronous motor (16) that does not have a rotor starting cage or windings. The system includes a dc source (10), an inverter (13) connected to the dc source for converting the dc to a multi-phase ac, and an ac synchronous motor connected to receive the multiphase ac, the motor being constructed without a starting cage or winding. The system further includes means (22) for sensing variations in the motor power angle, and a control circuit (27,28, 29,33) connected to respond to the variations and to cause the inverter output to vary such as to generate an ac component of torque that leads in phase the power angle variations at the natural frequency of the rotor of the motor. The inverter output may be varied by modulating the applied frequency, the dc bus current to the inverter, or the inverter phase angle.
Abstract:
When a shift position is changed from a non-forward operating position to a forward operating position during a predetermined operation that shuts off gates of a first inverter and a second inverter and operates an engine, a step-up/down converter is controlled to gradually change the voltage of a high voltage-side power line toward a required voltage that is lower than a reverse voltage of a first motor.
Abstract:
First pulse width modulation control is a control of generating a first pulse width modulation signal for a plurality of switching elements by comparison of modulated waves of voltage commands in phases based on a torque command for a motor with a carrier voltage, and performing switching of the plurality of switching elements. Second pulse width modulation control is a control of generating a second pulse width modulation signal for the plurality of switching elements based on a modulation factor of a voltage and a voltage phase based on the torque command and the number of pulses per unit period of an electrical angle of the motor, and performing switching of the plurality of switching elements. An electronic control unit is configured to switch the plurality of switching elements between the first pulse width modulation control and the second pulse width modulation control at irregular time intervals.
Abstract:
A motor drive device that inputs AC power from a power supply to drive a motor includes: a converter that converts the AC power from the power supply into DC power; a DC/DC converter that generates DC power produced by stepping-up, stepping-down, or stepping-up and stepping-down the DC power from the converter; an inverter that converts the DC power from the DC/DC converter into AC power and supplies to the motor; and an electrical storage capacitor that is provided between the DC/DC converter and the inverter.
Abstract:
Apparatus is provided comprising an electrical motor comprising a rotor and a stator, the rotor comprising a plurality of rotor teeth and the stator comprising a plurality of stator teeth. The apparatus has a driver circuit to drive the electrical motor comprising a boost converter comprising a charge storage element and coupled to a first terminal of a coil winding on at least one of the plurality of stator teeth, and a buck converter comprising the same charge storage element and coupled to the same first terminal of the coil winding on the at least one of the plurality of stator teeth. An inductive element of the boost converter and the buck converter is provided by the coil winding of the at least one of the plurality of stator teeth, and the charge storage element is referenced to a supply node for coupling the second terminal of the coil winding to an electrical supply.
Abstract:
A trans inductor having a powdery magnetic substance and a power converter using the trans inductor are provided. The trans inductor and the power converter reduce peak current flowing in an inverter power module (IGBT), improve inverter efficiency, reduce output RMS current (output effective current) and reduce capacitor consumption by applying a material with properties that are resistant against current saturation instead of a core material of a conventional trans inductor employed in a power converter. Accordingly, an inductance decreasing rate due to core saturation when high current is generated is improved and current flowing in a switch device is prevented from being abruptly increased.
Abstract:
A motor control system includes a motor having an output line, motor control circuitry that includes DC bus lines and a smoothing capacitor between the DC bus lines and converts DC power supplied from outside the motor control circuitry into AC power and supply the AC power to the motor as driving power, and short circuit circuitry that, while the motor control circuitry is not supplying the driving power to the motor, makes a short circuit between the output line of the motor and a negative line of the DC bus lines of the motor control circuitry.