32results about How to "Wide operating speed range" patented technology

A bladeless fan assembly for creating an air current includes a nozzle mounted on a base. The nozzle comprises an interior passage and a mouth for receiving the air flow from the interior passage and through which the air flow is emitted from the fan assembly. The nozzle defines an opening through which air from outside the fan assembly is drawn by the air flow emitted from the mouth. The nozzle is detachable from the base, which is preferably sized to be accommodated within the opening of the nozzle for transportation.

A fan assembly for creating an air current includes an air inlet, an air outlet, an impeller, a motor for rotating the impeller to create an air flow passing from the air inlet to the air outlet, the air outlet comprising an interior passage for receiving the air flow and a mouth for emitting the air flow, the air outlet defining an opening through which air from outside the fan assembly is drawn by the air flow emitted from the mouth, a control circuit for controlling the motor, a remote control for transmitting control signals to the control circuit, and at least one magnet for attaching the remote control to the air outlet.

A fan assembly includes a device for creating an air flow and an air outlet for emitting the air flow, the air outlet being mounted on a pedestal including a base and a height adjustable stand. The base includes an oscillating mechanism for oscillating the stand and the air outlet.

The invention provides a zero-sequence current suppression method of open type permanent magnet synchronous motor with double-inverter power supply, belongs to the technical field of motor control, and aims at solving the problem of zero-sequence current of the open type permanent magnet synchronous motor with the double-inverter power supply. The method is characterized in that the closed loop control for zero-sequence current i0=0 is added on the basis of a vector control system, so as to realize the suppression of the zero-sequence current; the zero-sequence current is calculated by detecting the three-phase current of the motor and is treated as the feedback quantity to build the closed loop control of the zero-sequence current; the output of a zero-sequence current ring is specified by zero-sequence voltage, and the zero-sequence current is suppressed by adjusting the zero-sequence voltage produced by the double inverters. The method is applied to the suppression of the zero-sequence current in the open type permanent magnet synchronous motor with double-inverter power supply.

The invention relates to a belt transmission type starting and power generation integrated machine. The belt transmission type starting and power generation integrated machine comprises a belt pulley, a driving end cover assembly, a stator assembly, a rotor assembly and a carbon brush end cover assembly and is characterized in that a bearing chamber is arranged at a position, corresponding to a rotor shaft, at the middle of a carbon brush end cover, a bearing sensor is arranged in the bearing chamber, the end part of a carbon brush in a carbon brush rack props against the circumferential surface of a current collection ring of a rotor shaft, a junction box is further arranged outside the carbon brush end cover, a wiring seat is fixedly arranged in the junction box and is used for connecting three phase cables, cable heads of the three phase cables are separately and fixedly provided with connection sheets, the connection sheets separately pass through a socket of the junction box and enter to the junction box to be fixedly connected with the wiring seat, a sealing cover is fixedly arranged at the top of the junction box, a temperature sensor is arranged at the end part of a stator iron core, and a signal wire connector of the temperature sensor is fixed on the carbon brush rack. The belt transmission type starting and power generation integrated machine is compact in structure and has the advantages of a rapid starting function, low starting noise, automatic switching between starting and power generation and high power generation efficiency, and also has functions of assisted electric power for an engine and vehicle braking energy recycle.

A rotary piston unit for IC engine, water turbine, steam turbine, water pump, air compressor, etc is composed of disk-shaped piston holder on mainshaft, multiple plate pistons running directionally around mainshaft in planetary mode, and two semi-cylinders on two end faces of planetary piston to form a piston space with alternative big and small cross-sections. The left part and right part of each plate piston sequentially and periodically come in said piston space to form piston effect, realizing the conversion between fluid energy and mechanical energy.

The invention discloses a position-free control method of a current source type synchronous reluctance motor system. The problems of reduced system reliability, sensitivity to disturbance and noise and increased system cost caused by a motor position sensor can be solved. The system structure comprises an AC power grid; a current source type rectifier unit is connected with a multi-winding transformer through a three-phase filter capacitor bank; the current source rectifier unit is connected with a current source inverter unit through a DC bus inductor; and the current source inverter unit is connected with the synchronous reluctance motor through the three-phase filter capacitor bank. The position-free control strategy comprises the following steps: injecting a high-frequency current signal into the d axis of the motor; sampling and calculating the motor stator voltage to obtain the stator q-axis voltage of the motor; extracting a high-frequency component in the q-axis voltage of the motor, and processing to obtain a position signal of a motor rotor; and establishing a predicted rotor coordinate system to realize position-free control of the synchronous reluctance motor.

The invention discloses a dynamic torque measurement sensor with a speed measurement function. The sensor comprises an integral conductive slip ring, an elastomer spindle, bearings, a shell, and fastening screws. The integral conductive slip ring has an inner ring and an outer ring which can rotate relative to each other, and the inner ring and the outer ring lead out multiple wires respectively. The wires are connected inside the slip ring. The integral conductive slip ring sleeves the elastomer spindle. The elastomer spindle is rotationally supported on the shell through the bearings. The inner ring of the slip ring is fixed on the elastomer spindle by screws, and can rotate together with the elastomer spindle. The outer ring of the slip ring is fixed on the shell by a stop screw. The wires of the inner ring of the slip ring are connected with a strain gauge on the elastomer spindle. The wires of the outer ring of the slip ring are connected with a socket on the shell. Voltage and electrical signals are transmitted between the moving and static parts of the sensor through the integral conductive slip ring. The working speed range of the dynamic torque sensor is broadened, and the service life is prolonged. Moreover, the sensor is additionally provided with a speed measurement function.

The invention discloses a coaxial self-lubricating device for a vertical transmission mechanism. The coaxial self-lubricating device comprises a pump shell (1), and a cylindrical eccentric containingcavity (2) is formed in the lower end of the pump shell (1); a rotor (3) is arranged in the cylindrical eccentric containing cavity (2), and the bottom end of the rotor (3) is rotationally connected with a pump cover (5) through a bearing (4); the part, located in the cylindrical eccentric containing cavity (2), of the rotor (3) is provided with a blade groove (6), and a pair of blades (7) is arranged in the blade groove (6); and the blades (7) are in sliding connection with the blade grooves (6). According to the device, oil can be pumped during forward and reverse rotation; the working rotating speed range is wide, and the coaxial self-lubricating device is suitable for lubricating low-speed, high-speed and rotating-speed-adjustable transmission devices; and the displacement of the lubricating device can be set through adjusting the eccentric distance of the cylindrical eccentric containing cavity or the axial height of the cylindrical eccentric containing cavity. The coaxial self-lubricating device can synchronously work along with the transmission mechanism without extra power.

The invention discloses a planar linear thrust motor which comprises a machine body and a T-shaped sliding block. A linear sliding channel for the T-shaped sliding block to slide is arranged in the machine body, a plurality of iron cores are arranged in the sliding channel at intervals, a coil is arranged between every two adjacent iron cores, and an iron stress piece is arranged on the T-shaped sliding block. The planar linear thrust motor also comprises a start-stop valve used for controlling the coil to be electrified; and a controller in point connection with the start-stop valve. The magnetic suspension linear thrust motor is directly used, the planar linear thrust motor can be applied to elevator transformation of old housing communities, tower cranes are not needed, and energy conservation and environmental protection are achieved.