33results about How to "Reduce the difficulty of heat dissipation" patented technology

The present invention is applicable to the technical field of permanent magnet synchronous motors, and provides a motor driving method and a driving device, including: generating a first driving pulse signal and a second driving pulse signal according to the conduction sector signal; The first driving pulse signal acts on the three switching elements in the upper bridge arm of the inverter in sequence, and the second driving pulse signal acts on the three switching elements in the lower bridge arm of the inverter in sequence according to the conduction sector signal above; where the period of the conduction sector signal is three times the period of the carrier signal; the action time of the first driving pulse signal on each switching element in the upper bridge arm of the inverter The action time of each switching element in the lower bridge arm of the device is the same as the period of the carrier signal. The driving method of the invention enables each switching element of the inverter to switch only once in each electrical cycle, which reduces switching loss, lowers the calorific value of the equipment and the difficulty of heat dissipation, and improves the stability of the equipment.

The invention discloses a temperature control device, method and electrical equipment of a power device. The device comprises: a semiconductor thermopile unit, which detects the temperature of the power device to obtain the current temperature of the power device; an acquisition unit, which detects the temperature of the power device; Detecting the current of the power device to obtain the current current of the power device; and detecting the voltage of the power device to obtain the current voltage of the power device; the control unit, according to the current temperature and the adjacent The current current and the current voltage within two cycles generate a first control signal capable of controlling the cooling capacity of the semiconductor thermopile unit; the semiconductor thermopile unit is also under the control of the first control signal, The cooling capacity of the semiconductor thermopile unit itself is adjusted to control the current temperature of the power device. This solution can reduce the heat dissipation difficulty of the power devices in the electric controller of the electrical equipment, and improve the heat dissipation performance.

The invention discloses a design method of a self-adaptive headlamp based on a fly's-eye lens. In the field of an automotive headlamp, an existing technology has the defects of insufficiently enough light control, low efficiency for solar energy utilization and the like. The self-adaptive headlamp comprises a projection part and a reflection part, wherein light rays emitted by an LED (Light Emitting Diode) are collimated by a paraboloid and a collimating lens, light beams are uniformly imaged on a digital micromirror by double rows of fly's-eye lenses and a convergent lens, and every row of fly's-eye lenses is composed of three small lenses of different shapes. The design method provided by the invention has the beneficial effects of being precise to control, many in realized lighting mode and good effect of various lighting mode; furthermore, long-distance light and short-distance light are separately realized, therefore the cooling difficulty can be reduced; in addition, uniform light spots with light and shade cut-off lines are formed in a digital micro-mirror by the fly's-eye lenses, therefore, light energy can be saved, and the efficiency for solar energy utilization can be improved; the double rows of fly's-eye lenses are served as a light equalization system, therefore short optical distance and good light equalization effect can be realized.

The invention discloses a laminated type high-power magneto-rheological fluid clutch. The laminated type high-power magneto-rheological fluid clutch comprises a primary transmission shaft (4), a left rotary magnetic conductance side board (6), a magnet exciting coil (8), a fixing magnetic conductance outer shell (9), a right rotary magnetic conductance side board (14), a secondary transmission shaft (17), a magnetic conductance board (18), a plurality of layer-adjustable inner layer primary friction plate groups (3), outer layer primary friction plate groups (7), outer layer secondary friction plate groups (12) and inner layer secondary friction plate groups (15), inner layer small magnetic isolation ring groups (2), outer layer small magnetic isolation ring groups (5), an inner layer large magnetic isolation ring (13) and an outer layer large magnetic isolation ring (20). Compared with the prior art, the laminated type high-power magneto-rheological fluid clutch adopts a plurality of friction plate groups for transmission, effectively disperses a heat source, reduces the heat dissipation difficulty, utilizes cooling water for cooling, and obviously improves the transmission power and the heat dissipation effect. When the transmitted power is insufficient, a mode of increasing the layers of the friction plate groups can be adopted, and controllable operation of the transmitted power is easy to achieve.

A wireless communication device, comprising: a digital circuit board, a radio frequency circuit board, and an antenna circuit board; the digital circuit board, the radio frequency circuit board, and the antenna circuit board are stacked, and the radio frequency circuit board is electrically connected to the digital circuit board and the antenna circuit board. The above wireless communication device implements structural modularization and integrated design through a stacked architecture, thereby reducing the volume of the device.

The invention relates to the technical field of drilling tools, and specifically discloses a rolling support type deep hole drill, which at least includes a cutter body, and the front end of the cutter body is provided with different types of blades, which are respectively an inner blade, a middle blade and an outer blade. A blade, the outer wall of the blade body is provided with at least two guide support parts, the guide support parts at least include a roller and a roller accommodating cavity for accommodating the roller. On the basis that the rolling guide support part in this embodiment only has the function of guide support in the prior art, it not only reduces heat generation through rolling friction, and reduces the difficulty of heat dissipation in deep hole machining, but also assists cutting through rolling type. The hole wall is rolled to improve the surface quality of the hole wall. Compared with the prior art, a leap-forward progress is achieved, which is of particular significance for deep hole drilling.

The invention discloses a novel high-temperature-resistant fire-fighting smoke-discharge fan. The novel high-temperature-resistant fire-fighting smoke-discharge fan comprises an outer barrel, an innerbarrel which is coaxially arranged in the outer barrel and is sealed, a plurality of guide supporting parts for fixing the inner barrel, a through shaft motor which is coaxially mounted in the innerbarrel, smoke discharge fans which are connected with a rotary shaft of the through shaft motor, an air outlet channel and an air inlet channel for enabling the inner space of the inner barrel to communicate with the outer space of the outer barrel, an air exhaust guide ring which is arranged at the front end of the inner wall of the inner barrel and is tapered, a reversing transmission mechanismwhich is connected with the rear end of the rotary shaft, and an air-cooling mechanism which is driven by the reversing transmission mechanism; an air inlet of the air-cooling mechanism communicates with the air inlet channel; and an air outlet of the air-cooling mechanism faces towards the front end of the inner barrel. Through the sealed type fan of the inner barrel, high-temperature smoke is prevented from invading to increase the temperature of a motor operation environment; meanwhile, a ventilating channel which communicates with outside fresh air and the air-cooling mechanism which is synchronously driven by a fan motor are arranged, so that independent circulation of heat dissipation inside the inner barrel is realized, and an air-cooling way replaces a conventional water-cooling way, and therefore, operation stability of the motor is improved from multiple aspects.

The invention discloses a server and a server group. The server comprises a shell, and a fan and a server assembly arranged in the shell; the fan is arranged in the shell close to the first end planeof the shell; a first air inlet is formed in the first end plane; an air outlet is formed in the second end plane, opposite to the first end plane, of the shell, wherein a second air inlet is formed in one end, close to the fan, of the first side surface of the shell; and the first side surface is connected with the first end plane to enable the fan to induce air from the first air inlet and the second air inlet and to exhaust air from the air outlet so as to perform heat dissipation on the server assembly.

The embodiment of the invention discloses a multi-chip addressable TOF emitting module and a laser. The multi-chip addressable TOF emission module includes a substrate and a control drive chip arranged on one side of the substrate, at least two laser generator chips and circuit switches corresponding to the laser generator chips one by one, the circuit switch and the control drive The chip is electrically connected, the circuit switch is used to turn on or off according to the control signal output by the control drive chip, the laser generator chip is electrically connected to the circuit switch, and the laser generator chip is used to communicate with the conductive The laser generator chip connected to the circuit switch emits laser light. The technical scheme of the present invention controls at least two laser generator chips to emit light sequentially according to actual needs by controlling the drive chip, while ensuring the brightness of the FOI area, it reduces the duty cycle of the laser generator chip, reduces heat accumulation, and improves work efficiency. Efficiency, reducing the difficulty of heat dissipation.