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92results about How to "Reduce costs" patented technology

Sensorless direct-current brushless motor controller and control method thereof

The invention discloses a sensorless direct-current brushless motor controller and a control method thereof. The controller is composed of a power supply circuit, an MCU inverter control drive circuit and a sensorless detection circuit. The power supply circuit provides power for the MCU inverter control drive circuit and drives the direct-current brushless motor to work by the MCU inverter control drive circuit. The sensorless detection circuit detects a working voltage and an operating current of the direct-current brushless motor and sends detection results to the MCU inverter control drive circuit; the MCU inverter control drive circuit determines a counter electromotive force zero-crossing point based on combination of a position detection mid-point method with an ADC sampling method and the 30-degree electrical angle of a rotor is delayed to determine a commutation time of the motor, so that the direct-current brushless motor is driven to accelerate slowly until a predetermined rotation speed is reached. According to the controller disclosed by the invention, the commutation time of the motor is determined and the direct-current brushless motor is controlled to work at the predetermined rotation speed. The sensor part is reduced; the cost is lowered; and the reliability is enhanced.
Owner:WUXI SHUANGNENGDA TECH

Pipe jacking construction process

the invention discloses a pipe jacking construction process. The pipe jacking comprises steel pipes. The pipe jacking construction process comprises the following steps of: excavating a steel pipe groove; respectively fixing a winch on the left and right of the rear of the steel pipe groove; excavating a soil tank vertical to the steel pipe groove on the top of the steel pipe groove, arranging channel steel in the soil tank, and fixing iron piles on two sides of the channel steel; welding a steel pipe connecting sleeve at one end of the steel pipe; sleeving a conical head on the head of a first steel pipe, sleeving a cap on the tail of the first steel pipe, and hanging and connecting a movable pulley, wherein the movable pulley is connected with the winches and is connected with the steel pipe through a linkage device, and a fixed pulley is fixed to the iron pile; twisting a plurality of circles of steel wire rope on the winches; and jacking the first steel pipe, detaching the cap, sleeving the head of a second steel pipe on the tail of the first steel pipe, arranging the cap on the tail of the second steel pipe, and repeating the process until the steel pipes are jacked to pass through the road surface. The pipe jacking construction process can reduce the damage to the road surface, reduce application of large vehicles and environmental pollution, has short construction time and low cost, and has the characteristics of energy conservation, emission reduction and efficiency improvement.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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