A motor overload protection device based on a DC shunt
By designing a motor overload protection device based on a DC shunt, the problems of excessive resistance and reliance on foreign technology in existing motor overload protection devices have been solved. This enables timely alarm and automatic recovery of motor overload, meets complex thermal protection requirements, and improves the product's versatility and evaluation efficiency.
CN115833041BActive Publication Date: 2026-06-30CHENGDU HOLMES ELECTRIC CO LTD +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHENGDU HOLMES ELECTRIC CO LTD
- Filing Date
- 2022-11-30
- Publication Date
- 2026-06-30
Smart Images
Figure CN115833041B_ABST
Abstract
This invention relates to the field of overload protection technology, specifically to a motor overload protection device based on a DC shunt. It includes a DC electric valve thermal relay and its matching shunt. The DC electric valve thermal relay and its matching shunt include a primary amplification circuit, a range selection circuit, a secondary amplification circuit, a rate calculation circuit, an RC charging and discharging circuit, a rate hysteresis circuit, an automatic zeroing circuit, a self-reset circuit, and a relay control circuit. The motor overload protection device of this invention features a simple RC combination method, making it easy to change the R value. If new valve protection requirements arise, simply changing the R value can adjust for more inverse time protection functions to meet the new valve motor requirements, without needing to redesign and adjust the entire product. This not only does not affect subsequent evaluation but also quickly expands the product's versatility.
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