Voltage Rating of a Servo Motor or ActuatorHardware: Motion Control>>Power Drives
Problem: The MID servo drive has an output voltage of 48 V, however my servo actuator is only rated for 12 V. Can I use my actuator with the MID? Solution: As described in the document linked below, the motor in your actuator will most likely tolerate the 48 V PWM output of the MID. As far as the motor is concerned, the average voltage and current are more significant than the brief 48 V peaks. Some actuators however include components in the electrical circuit that can be damaged by excessive voltage, even for a very short duration. For example, some actuators use diodes and physical switches to limit travel. When the actuator reaches one end of travel, a switch is closed that connects a diode in the motor power circuit. The diode blocks current in one direction, which prevents the motor from moving further into the limit and only allows it to move in the direction away from the limit. Another switch and diode with opposite polarity handle the other end of travel. An actuator rated for 12 V may contain diodes rated for 20 V or 30 V (peak reverse voltage). These diodes can be instantly destroyed by the 48 V PWM source even though the motor is perfectly content. If you have any questions about the internal electrical components of your actuator, the best solution is to contact the manufacturer and ask specifically whether it is compatible with the drive you want to use. Electrical specifications for all National Instruments motor drives are given in their respective manuals. Related Links: Using a Stepper or Servo Motor if its Voltage Rating is Much Lower than the Motor Drive Voltage Rating Power Drive User Manuals Attachments:
Report Date: 11/12/2002 Last Updated: 01/13/2003 Document ID: 2RBERM6W |
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