Gearbox torque testing system

Abstract

The invention discloses a gearbox torque testing system comprising a motor unit, a generator unit, a prime mover unit and a tested gearbox unit. The gearbox torque testing system is characterized in that the motor unit comprises a motor G1 and an inverter C1; the generator unit comprises a motor G2 and an inverter C2, and the motors in the motor unit and the generator unit are doubly-fed motors; the tested gearbox unit comprises a tested gearbox R1 and a tested gearbox R2 which have the same speed ratio, wherein the low-speed ends of the tested gearbox R1 and the tested gearbox R2 are rigidly connected through flanges, and high-speed ends are respectively connected with the motors in the motor unit and the generator unit; a prime mover G3 in the prime mover unit is connected with the motor G1 or the motor G2; and connecting wires of stator power supplies of the motor G1 and the motor G2 are connected with each other. The system has the advantages of simple structure, convenient production and low cost and is suitable for extensive popularization in the field of gearbox torque testing.

Description

technical field [0001] The invention relates to a gearbox torque testing system, in particular to a system for testing the gearbox torque by controlling the excitation current of the rotor of a winding motor. Background technique [0002] With the continuous development of industries such as wind power generation and automobile manufacturing, the performance requirements for the core components --- gearboxes are getting higher and higher. In order to meet the performance test of the gearbox, it is necessary to design a test platform for applying different torques to the gearbox at different speeds. There are two common solutions: the first is to use two asynchronous motors as generators and motors, as shown in Figure 1. The two motors are respectively controlled by a full-power frequency converter, and at the required speed, the required torque is generated for the tested gearbox to test the performance of the gearbox. The second scheme, as shown in Figure 2, is to use two...

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Problems solved by technology

Since the electromagnetic torque of the synchronous motor is related to the power angle and the rotor excitation current, the above reasons cause the lagging excitation angle between the rotor of the motor G1 and the rotor of the generator G2 to become larger, so that the adjustment range of the power angle becomes smaller. Since the excitation current of the synchronous motor is DC Excitation, the rotor excitation angle is uncontrollable, so the required torque cannot be achieved by adjusting the rotor excitation current alone, the stator angle of the synchronous motor must be adjusted by mechanical means (rotating the synchronous motor casing), and then the rotor excitation phase angle is changed to compensate for the power angle change The impact of reduced scope

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