The traction motor of the elevator has an AC motor and a DC motor, and the traction motor is a power source that drives the elevator up and down. The elevator is a typical potential load. According to the working nature of the elevator, the elevator traction motor should have the following characteristics: 1. It can be started and brakeed frequently: the number of brakes per hour during the operation of the elevator is often more than 100 times, and the maximum speed can reach 180 to 240 times per hour. Therefore, the elevator-specific motor should be able to start and brake frequently. The mode is intermittent periodic work. 2, the starting current is small: in the design and manufacture of the squirrel cage rotor of the AC motor for the elevator, although the guide bar is made of low resistivity material, the short circuit of the rotor is made of high resistivity material to make the rotor winding The resistance has increased. In this way, on the one hand, the starting current is reduced, and the starting current is reduced to about 2.5 to 3.5 times the rated current, thereby increasing the number of starts per hour; on the other hand, since only the short-circuit end of the rotor has a large resistance, it is advantageous for direct heat. Dissipated, the combined effect makes the temperature rise of the motor drop. Moreover, sufficient starting torque is guaranteed, which is generally about 2.5 times the rated torque. However, compared with ordinary AC motors, the mechanical properties of the hardness and efficiency have decreased, and the slip rate has also increased to 0.1 to 0.2. The mechanical characteristics are softened, the speed regulation range is increased, and the motor is not burned when working under the stall torque. 3, the motor running noise is low: in order to reduce the motor running noise, the use of sliding bearings. In addition, the effective outer diameter of the stator core is appropriately increased, and the shape of the stator core punch is appropriately treated.
Shear Beam Load Cells are widely used where operators need to measure compressive forces. The core component of a shear beam load cell is a spring element. This element is a piece of metal that is elastically deformed under load and recovers the moment the load is removed.
The (single-ended) shear beam is designed for low profile scale and process applications. The shear beam capacities are from 100kg to 50t. One end of the shear beam contains the mounting holes while the opposite end is where the cell is loaded. The load cell should be mounted on a flat smooth surface with high-strength hardened bolts. The larger shear beam cells have more than two mounting holes to accommodate extra bolts to keep the hardware from stretching under stress load.
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