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What is dv/dt from Motor Drives?
Dv/dt can be a problem when motors are connected to motor drives. Figure 1 shows a typical electric motor and motor drive (also called a VFD). A cable connects the drive to the motor. In some...
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NEMA MG 1-2016 Standard for Voltage Stress in Motors and Drives
Due to the negative effects of switched power electronic drives on electric motor lifetime in certain situations, several industry standards have been developed. These standards set recommended limits...
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Simple Motor Cable Simulation Model
A circuit model of a cable and motor system is useful for simulation of the voltages at the motor terminals. Figure 1 shows a simple model for the cable and motor system. The model is valid out to...
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Passive Filter Topologies for Motor Protection
Passive filters are sometimes used at the output of a drive connected to an electric motor in order to mitigate the negative effects of fast rise times and high peak voltages due to ringing at the...
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dv/dt Simulation Scenario 1: SiC Drive
Silicon Carbide Motor Protection Issues Silicon Carbide (SiC) devices have several advantages over traditional silicon IGBTs, including lower switching losses and higher peak junction temperatures....
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dv/dt Simulation Scenario 2: Long Motor Cable
Long Cable Motor Protection Issues In this dv/dt simulation example, we will look at how motor cables affect ringing and dv/dt at the motor terminals when the cable between the motor and drive is long....
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Integrated dv/dt Filters for Motor Drives
Some motor and drive systems require output filters to protect the motor from high dv/dt or for EMI compliance. However, these filters are often physically large, sometimes exceeding the size and...
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Motor Cable Impedance Measurement
Motor cable impedance is a required parameter for accurate simulation of the voltage ringing and overshoot at the motor terminals. There are methods to calculate the cable inductance and capacitance...
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Simple Electric Motor Impedance Measurement
Accurate impedance measurements of an electric motor over a range of frequencies are critical to forming a model of the machine that is useful for dv/dt simulation. The simulation tool on this website...
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