64 results about "Motor soft starter" patented technology

A system and method for optimizing current filtering in a motor soft starter is disclosed. A motor soft starter includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor, with the circuit being operable in a ramping mode and a bypass mode so as to control current flow and terminal voltages in the AC motor. The soft starter includes a controller connected to the circuit to control operation thereof, with the controller including a configurable current filter. The controller determines a current of an AC power provided to the input terminal of the AC motor from the soft starter, identifies a present operational mode of the soft starter as being one of the ramping mode and the bypass mode, and performs filtering on the determined current based on the present operational mode of the soft starter.

The invention discloses a soft starter for mesolow and high voltage motors, which consists of three phase bridges. The invention relates to starting control without impact of middle, low and high voltage alternating current motors. The soft starter takes a thyristor three-phase full-control rectifier bridge which works based on short circuit at the direct current side as an AC voltage regulator, the stator winding of a motor is connected in the AC loop of the rectifier bridge, and the mesolow (220-380-660V) motor can achieve 'one drives N' soft starting by phase control; the low-voltage coil of an isolation transformer is connected in the AC loop of the rectifier bridge, the stator of the motor is connected with the high-voltage coil in series, and the high voltage (3-6-10KV) motor can achieve 'one drive N' soft starting by phase control. A plurality of groups of low-voltage coils are arranged and a plurality of sets of rectifier bridges are adopted, thus forming a high voltage 'multiplex' soft starter, so that the problem that the high-power mechanical and electrical transmission system can be started under control.

The invention discloses a brushless joint-control motor soft starter used for a wound-type alternating-current asynchronous motor. Compared with the conventional brushless self-control soft starter, the brushless joint-control motor soft starter has the characteristics that: the joint sequence control of a water resistor, a shorting switch and a safety exhaust valve avoids a liquid spray phenomenon; 2, the water resistor adopts a graphite pole plate and is contacted before the shorting circuit, so that the electro erosion of the pole plate of the water resistor is reduced, the phenomenon of the fusion welding of a moving contact and a fixed contact of the shorting switch is avoided; 3, the on and off states of the shorting switch are controlled by two units respectively, so that the jumping phenomenon of the moving contact and the fixed contact is avoided, and the contact pressure of the contacts is improved; 4, the contact time of the shorting circuit and the water resistor can be conveniently regulated after leaving a factory, so that the adaptability is improved; 5, a safety valve and an exhaust valve are integrated and are linked with the shorting switch, so that the number of seal surfaces is reduced and the starter is convenient to maintain; and 6, according to different users, different implementation modes can be adopted, and the manufacturing cost is reduced.

The invention discloses a fuzzy control strategy-based asynchronous motor soft starter. The soft starter comprises a central processing unit (CPU), a three-phase power supply, a power supply module, a keyboard module and a display module, wherein the three-phase power supply is connected with the CPU through a current detection module and an analog / digital (A / D) conversion module. The soft starter is characterized by also comprising a joint test action group (JTAG) simulation debugging module, a thyristor conduction angle measuring circuit and a thyristor driving voltage regulating circuit connected with the CPU, wherein the thyristor driving voltage regulating circuit is connected with a motor. The fuzzy control strategy-based asynchronous motor soft starter can simultaneously provide two start modes for a user to select, and in the two start modes, the thyristor trigger angle is calculated by adopting a fuzzy control table. Compared with the traditional thyristor soft starter, the fuzzy control strategy-based asynchronous motor soft starter has the advantages of strong interference resistance, high control speed, high robustness, strong adaptability and the like.

The invention discloses an intelligent motor soft starter which comprises a base and an upper cover. A liquid crystal display and an operation button are arranged on the top wall of the upper cover. The intelligent motor soft starter is characterized in that the starter further comprises a front junction device and a rear junction device which are arranged at the front and rear ends of the base respectively, the front junction device and the rear junction device are provided with a plurality of terminal block components and partition boards, the partition boards are used for insulating and isolating the terminal block components, accommodating holes matched with the front junction device and the rear junction device are arranged on the base and the wall bodies of the front and rear ends of the upper cover, and the front junction device and the rear junction device are fixed on the base or the upper cover in a snapping or a bolt connecting mode. The intelligent motor soft starter has the advantages that the structure is reasonable and compact and the performance is stable and reliable.

The invention provides an iron core structure with permanent magnet materials for auxiliary excitation. The iron core structure is formed by a single square iron core or splicing of a plurality of square iron cores and adopts the structure form of AC / DC winding loose coupling. The iron core structure is characterized in that permanent magnet material bodies are installed outside or inside the iron core; the directions of the magnetic fields generated by the permanent magnet material bodies are identical to the directions of the magnetic fields generated by DC excitation; the permanent magnet material bodies can be wholly or partially embedded into one or a plurality of sections of the iron core; or a group of strip-type, plate-type or barrel-type permanent magnet material bodies are assembled outside or inside the iron core along axial directions of iron core columns; and the permanent magnet material bodies can be installed on the iron core column at the AC side, on a yoke outside the iron core or at the corners of the iron core. The iron core structure adopts the permanent magnet materials to provide constant bias, is suitable for the electrical equipment with iron cores needingto work under the condition of saturated bias, such as saturated iron core reactors, saturated iron core superconducting current limiters, motor soft starters and the like, and can effectively reducethe volume and weight of the equipment and lower the manufacturing cost.

The invention provides an intelligent Chinese character display solid-state soft starter, and belongs to the technical field of the motor soft starter. The invention solves the problems that a motor generates secondary pulse with heavy current by adopting a Y-Delta starter or a self-coupling voltage-reduced starter, so that the price of a variable frequency starter is high; and the prior analog type and digital intelligent liquid crystal Chinese character display soft starter is less in functions and inconvenient in operation. The soft starter is characterized in that a signal collected from the motor is transmitted to an MCU through a signal processing circuit and processed by the MCU; on the one hand, the processed signal is transmitted to a liquid crystal display for display, on the other hand, the processed signal is transmitted to a thyristor to trigger the processing of a control circuit, so as to form a triggering control signal to control a thyristor module contactor and the voltage in a main circuit; clock data read by the MCU from a clock circuit is stored in an E<2>PROM storage unit; and the software composition process is solidified in the MCU. The invention adopts the processing of a high-speed singlechip, an RTX-51 real-time operating system is internally embedded, a secondary menu of the graphic liquid crystal display is operated, and the functions of the measurement, the control, the protection and the failure record are integrated, so that the operation is direct-viewing and simple, and the performance is reliable.

The anti-misoperation isolating switch relates to an isolating switch, in particular to an isolating switch suitable for a motor soft starter cabinet. The invention prevents the handle from being locked when the handle is in the on position, so as to prevent the large motor from running and stopping in time when an accident is about to be caused or has already been caused. The invention has a cabinet door anti-misoperation operating system with the function of locking the cabinet door of the motor soft starter cabinet. During the operation of the large motor, the cabinet door is locked by it and cannot be opened to prevent high voltage from passing through the motor soft starter cabinet. When the power is on, the equipment will be damaged or electric shock will be caused. The present invention reasonably restricts the starting of large motors and the opening of cabinet doors through the above-mentioned two easy-to-operate error-proof operating systems, thereby ensuring the safety of staff and equipment.

The invention discloses a buffer starter comprising a starter body. Pusher dogs are arranged on two sides of the starter body and are fixedly connected with the starter body through a sealing pad, pressing pieces are arranged in the pusher dogs and made of elastic materials, the insides and two ends of the pressing pieces form hollow cavity structures, buffer springs which are spiral springs are arranged in hollow cavities, the height of the buffer springs is smaller than the length of the pressing pieces, two ends of the buffer springs can extend out of the pressing pieces when in elastic pressing, and the pusher dogs are respectively connected with a pusher dog shaft and a crankshaft. The buffer starter effectively solves the problem that existing starters are low in rotation speed, high in operation load and a stay cord is tight to add difficulty in starting during starting, various parts are not collided and worn, and effective buffer and energy storage are realized under the action of the buffer springs, therefore, recoil force of the air cylinder of a gasoline engine is effectively buffered, vibration is reduced to the great extent and starting is more labor saving.