MDA800 Motor Drive Analyzer Test Challenges for Motor Drive and Control Systems

Motors are widely used in various fields, such as home appliances, electric vehicles, elevators, conveyor belts, etc. In order to improve efficiency and improve motor control accuracy, motor drive systems and control systems include increasingly complex control algorithms, while motor drive systems typically use three-phase AC input and three-phase AC output to increase the flexibility and efficiency of the motor control signals, so the entire Commissioning analysis of motor systems has become increasingly complex. In response to the testing challenges of complex motor systems, Teledyne LeCroy has introduced the MDA800 series of motor drive analyzers. This article describes how LeCroy's motor-driven analyzer, the MDA800, helps engineers meet the testing challenges of increasingly complex motor-driven systems.

Typical motor drive and control systems include power conversion, motors, and embedded control systems. The power conversion section includes a three-phase input and a three-phase output to control the operation of the motor. The motor part transmits the relevant information of the motor operation such as speed, torque, rotation angle, direction, position, etc. to the embedded control system through various sensors. The embedded control system adjusts the power of the power conversion part in real time according to the operation information of the motor. The input of the gate-level pulse width modulation signal of the semiconductor, thereby adjusting the three-phase output of the power module to adjust the running state of the motor in real time, the whole system is a closed loop system.

Typical motor drive and control system

1, need more test input channels

Three-phase input voltage and current, three-phase output voltage and current, and voltage and current monitoring of multiple power semiconductors require more test input channels for real-time complete test systems.

2, can analyze the various power and efficiency of three-phase input

Three-phase input and output each have three voltages and currents, and because the load will cause phase advance or lag between voltage and current, it is also necessary to be able to test the active power of each phase input and output, apparent power, reactive power Power, efficiency and other power related parameters.

3, need higher bandwidth

Semiconductor processes are constantly evolving, such as silicon carbide processes, with a rise time of about 5 ns, and their use in power semiconductors is becoming more and more popular, requiring test instruments with bandwidths of up to several hundred MHz.

The use of high-speed complex embedded systems involves universal serial interfaces such as serial buses such as USB, Ethernet, and CAN, as well as higher bandwidth for test instruments.

4, need a higher storage depth

Because the start-up process of the motor, the analysis from no load to the overload process is usually very important, this process usually takes a long time, so the test instrument needs to have a long storage depth.

5, can measure the mechanical characteristics of the motor

The motor drive and control system and the motor are a complete system. For the overall analysis and debugging of the system, the test instrument needs to analyze the mechanical characteristics of the motor such as speed, torque, rotation angle, direction and position.