36results about How to "The circuit is simple and reliable" patented technology

The invention relates to an HVAC (heating ventilation and air conditioning) control system of a household central air conditioner, comprising an HVAC system controller, a centrifugal blower motor, a compressor motor, and an axial fan motor, wherein the HVAC system controller comprises an HVAC microprocessor, a sensor, a motor control interface unit and a power supply portion; the power supply portion is used to supply power for circuits of various parts; the sensor transmits a detection signal to the HVAC microprocessor through a signal processing circuit, wherein at least one of the centrifugal blower motor, the compressor motor and the axial fan motor is a permanent magnet synchronous motor without a motor controller; the motor control interface unit comprises an inverter unit and a rotor position detecting unit; the HVAC microprocessor drives the permanent magnet synchronous motor without the motor controller through the inverter unit; the rotor position detecting unit transmits a rotor position signal of the permanent magnet synchronous motor without the motor controller to the HVAC microprocessor to process. According to the invention, overlapped circuit configuration is removed, circuit structures are simplified, product cost is reduced greatly, and resource waste is reduced.

The invention provides a converter valve steady-state operation test device using a capacitor to bear bias voltage and a converter valve steady-state operation test method thereof. The device comprises a test valve 1, a test valve 2, a capacitor CL, a transformer T1, a circulating current restraining reactor L01, a switch K01 and an AC test power supply S0. One end of the test valve 1 and one end of the test valve 2 are connected and grounded, and the other end of the test valve 1 and the other end of the test valve 2 are respectively connected with the two sides of the circulating current restraining reactor L01. The secondary winding of the transformer T1 is connected in series with the capacitor CL and then one end is grounded and the other end is connected with any end of the circulating current restraining reactor L01. The primary winding of the transformer T1 is connected in series with the switch K01 and then connected with the AC test power supply S0. A DC voltage component between the converter valve ends is borne by using the capacitor connected in series in the loop, and charging and energy supplementing are performed on the test system by depending on the common transformer without configuring a DC power supply or additionally arranging an energy supplementing valve. A low-power single-phase transformer can be simply used as the transformer or a voltage regulator can be used as the transformer so that the main loop is simple and reliable.

A continuous casting ladle sliding nozzle hydraulic transmission system, which consists of a pressure-adjustable electro-hydraulic source, an emergency hydraulic source, a three-position four-way H-type neutral function manual reversing valve, an oil filter device, a quick connector, a hose, and a working Oil cylinder composition. The pressure oil provided by the electro-hydraulic source passes through the interface A of the H-type mid-position function manual directional valve, passes through the two-position directional valve, and then goes through the oil filter device, quick connector, and hose to the rodless chamber in the working cylinder to realize sliding. The water port is closed; the pressure oil goes to the rod cavity in the working cylinder through the interface B, the oil filter device, the quick connector and the hose, and the piston rod is pushed to realize the opening of the sliding water port. The H-type neutral function manual reversing valve can release the pressure by itself when it returns to the neutral position, which is beneficial to the connection of the quick joint. In the event of a power failure in an unexpected situation, you only need to shake the handle of the emergency hydraulic source repeatedly to automatically cut off the electro-hydraulic source. The emergency hydraulic source provides pressure oil to the rodless cavity in the working cylinder, and the sliding nozzle can also be closed to avoid the accident of molten steel loss and burning equipment.

The invention discloses a rotating speed detection device and method for a magnetic suspension high-speed motor. The device comprises a rotor, wherein the periphery of the rotor is sleeved with a bearing pedestal and an axial displacement detection disc, a rotating speed and rotating direction monitoring sleeve is disposed between the bearing pedestal and the axial displacement detection disc, the rotating speed and rotating direction monitoring sleeve is disposed on the periphery of the rotor in a sleeving manner, an axial displacement sensor component sleeves the periphery of the rotating speed and rotating direction monitoring sleeve, the axial displacement sensor component is fixed on the bearing pedestal, a groove is formed in the outer circle of the rotor, the axial displacement sensor component is used for measuring the distance between the axial displacement sensor component and the outer circle of the rotor and outputting a position signal, and a signal line of the axial displacement sensor component is connected with a main control chip DSP of the magnetic suspension high-speed motor through a signal conditioning circuit. The main control chip DSP of the magnetic suspension high-speed motor processes square wave signals output by the signal conditioning circuit to obtain the rotating speed and the rotating direction of the magnetic suspension high-speed motor, and the device has the advantages of being simple and reliable in structure and circuit and low in cost.