Single Chip Microcomputer STM32L151CCU6

Photocoupler

I tested a Yaskawa Σ5 servo motor (rated voltage: 200V, power: 400W, speed: 3000 RPM) using a multimeter and measured 300V. Then, I used the Yanzhao JD194E multi-function transmitter to measure over 2800 volts, and it showed around 100V. Is this correct? Or is there something wrong with my measurement? When the motor reaches its rated speed, should the voltage be exactly 200V? Here's what I know about servo motor voltage: 1. Whether it's a DC or AC servo motor. 2. At high speeds, the voltage is generally proportional to the speed. 3. At low speeds, the voltage may be lower than the speed drop due to load. 4. Even when the motor isn't rotating (speed = 0), the voltage is not zero. 5. In simple terms, the voltage changes with the motor's speed. 6. The voltage equals the back EMF plus the armature voltage drop. So, what's the voltage when the motor is at 0 RPM? At zero speed, if the motor is producing its rated torque, the voltage equals the rated current multiplied by the armature resistance. This is because the back EMF is zero at rest, so all the applied voltage is used to overcome the internal resistance of the motor. It’s important to understand that the relationship between voltage and speed in a servo motor isn’t always linear, especially under varying loads or control conditions. If you're measuring voltages that seem inconsistent with the rated values, it could be due to factors like feedback errors, signal interference, or even improper calibration of the measuring device. Always double-check your setup and ensure the tools are properly grounded and functioning as expected.