Key words: Hekang frequency conversion, lifting industry, electric hoist 1. Foreword Electric hoist has not been controlled by inverter in the past, and the current and mechanical impact are very large during startup. When the timing is not well matched, the lifting mechanism will also produce slipping phenomenon. And the speed of decline cannot be controlled either. The frequency conversion speed regulation has the advantages of energy saving, environmental protection, and reduced starting current. The electric hoist adopts Hekang inverter to change the frequency of the power supply to control the rotation speed of the motor, and the operation performance has been greatly improved.
2. Project Description Project Name: Motor drive system of an electric hoist with electric hoist in Changchun A. Lifting mechanism: 1 set of 15kW conical rotor brake three-phase asynchronous motor drive B, dray running mechanism: 2 1.5kW electromagnetic brakes Three-phase asynchronous motor drive requires two motors to work at the same time. C, trolley running mechanism: two sets of 0.8kW three-phase asynchronous motor drive requires two simultaneous work
3. On-site application requirements 1. It requires large low-frequency torque and strong overload capacity.
2. It is required to improve the accuracy of the descending position, and the positions of heavy-duty and no-load parking are basically the same.
3, reduce noise, reduce motor temperature rise, protect the motor.
4. Selection of braking resistor: The lifting mechanism will generate a large amount of regenerative energy in the course of descent. It will often trip due to overvoltage. Therefore, it must be equipped with a braking unit and braking resistor. The unit, equipped with a suitable braking resistor, guarantees normal operation of the frequency converter.
4. On-site frequency conversion control solution
1. The hoisting mechanism adopts HID620A series inverters for control, adopts no-PG vector mode to control the raising and lowering of the lifting mechanism, and uses multi-speed control mode to realize high-speed and low-speed conversion.
2. The vehicle running mechanism adopts HID300A series inverter to simultaneously control two motors to achieve positive and negative rotation and high-speed and low-speed conversion.
3. The trolley running mechanism adopts HID300A series inverter to simultaneously control two motors to achieve positive and negative rotation and high-speed and low-speed conversion.
5. Inverter commissioning
6. Application effect The frequency conversion controlled electric hoist has the following features:
â— Reduce the impact of starting and braking The electric hoist has a smooth running performance, can be braked in the basic stop state, which can reduce the impact of the start, brake, especially suitable for high accuracy of goods in place No shock and vibration working environment is allowed.
â— Large low-frequency torque and strong overload capability Without PG vector control, 0.25Hz outputs 180% torque output and 180% rated current 1S overload capacity.
â— It is convenient to set the running speed of carts and trolleys to control the frequency by changing the frequency of the power supply through the inverter. The speed of the motor is set by using the multi-speed control method to improve the accuracy of the positioning operation, and jog operation can also be performed.
7. Conclusion After the electric hoist is driven by HID620A series inverter, the performance of the whole machine is greatly improved, and the lifting hoist is smooth, stable and accurate. In addition, the inverter has complete protection functions, such as overcurrent, overload, overvoltage, etc., can be alarmed and stopped in time, which effectively reduces the temperature rise of the motor, reduces the failure of the electric hoist, improves the safety performance, and reduces the maintenance cost. Hekang inverter has been widely used in electric hoists.
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