Medical device resistor model/specification
Model/specification
Brand/trademark
Brand/trademark Taiwan Dayi
Environmental protection category
Environmental protection category Lead-free and environmentally friendly
Our company sells Taiwan Dayi Resistors and Shenzhen medical device resistors as agents. We provide you with alloy resistor products with power (dividions of watts), precision of , resistance value of , and packaging of Resistance products, R medical equipment resistance temperature coefficient
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The following is the action process of the braking unit. When the motor decelerates under the action of external force, the motor runs in a power generation state and generates regenerative energy. The three-phase AC electromotive force generated is rectified by a three-phase fully controlled bridge composed of six freewheeling diodes in the inverter part, causing the DC bus voltage in the frequency converter to continue to increase. b. When the DC voltage reaches a certain voltage (the opening voltage of the braking unit), the power switch of the braking unit is turned on, and the current flows through the braking resistor. , the braking resistor releases heat and absorbs regenerative energy, the motor speed decreases, and the inverter DC bus voltage decreases. , when the DC bus voltage drops to a certain voltage (braking unit stop voltage), the power tube of the braking unit is turned off. At this time, no braking current flows through the resistor, and the braking resistor naturally dissipates heat and reduces its own temperature. . When the voltage of the DC bus rises again and the braking unit operates, the braking unit will repeat the above process to balance the bus voltage and make the system operate normally. Since the working condition of the braking unit is a short-time operation, that is, the power-on time is very short each time. During the power-on time, its temperature rise is far from reaching a stable temperature rise, and the intermittent time after each power-on is longer. During the intermittent period, its temperature is enough to drop to the same as the ambient temperature, so the rated power of the braking resistor will be greatly reduced, and the price will also decrease. In addition, since there is only one B, the braking time is in stages, which affects the turning on and off of the power tube. The transient performance index requirements are low, and the turn-off time is even required to be as short as possible to reduce the turn-off pulse voltage. The control mechanism of the protection power tube is also relatively simple and easy to implement. Due to the above advantages, it is widely used in potential energy loads such as cranes and situations where rapid braking is required but short-time working conditions are required.
Medical device resistor precision resistor