A current detection device for a motor driver and the motor driver

Abstract

The invention provides an output current detection device of a motor driver, and the motor driver. Three current sampling modules are adopted by the device to collect three-phase output currents respectively, and the voltage amplitudes corresponding to the sampled signals are adjusted to corresponding voltage ranges; the voltage amplitude corresponding to the first phase sampling signal is adjusted to a first voltage range, the voltage amplitude corresponding to the second phase sampling signal is adjusted to a second voltage range, and the voltage amplitude corresponding to the third phase sampling signal can be adjusted to the first voltage range, the second voltage range or a third voltage range, and therefore common-factor failure caused by failure of the sampling modules can be eliminated. In addition, the three sampling modules are powered by at least two independent power supplies, so that the common-factor failure caused by the failure of the power supplies is eliminated. Therefore, reasonability verification can be carried out on output currents obtained by sampling, and whether the sampled signals are accurate and effective or not can be detected through reasonability verification, so that the uncontrollable risk of output torque of the motor driver can be avoided.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to an output current detection device of a motor driver and the motor driver. Background technique [0002] The system variables of the motor driver, such as the output current, are used to control the output torque. Inaccurate sampling of the output current may result in inaccurate or uncontrollable output torque of the motor driver. [0003] At present, there is a possibility of common cause failure in the sampling of the output current of the motor driver, which leads to the inability to verify the rationality of the collected output current, or the result of the rationality verification is inaccurate, which eventually leads to low torque control accuracy of the motor driver or The output torque is out of control. Among them, common cause failure refers to the simultaneous failure of two or more units in a system due to some common cause. Contents of the inve...

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Problems solved by technology

[0002] The system variables of the motor driver such as output current and other parameters are used to control the output torque. Inaccurate sampling of the output current may lead to inaccurate or uncontrollable output torque of the motor driver

[0003] At present, there is a possibility of common cause failure in the sampling of the output current of the motor driver, which leads to the inability to verify the rationality of the collected output current, or the result of the rationality verification is inaccurate, which eventually leads to low torque control accuracy of the motor driver or Output torque out of control

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