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Infranor: AC Brushless Servo Motors (MQA Series)
MQA servo modules are extremely compact PWM servo amplifiers that provide 4 quadrant speed control of any trapezoidal servo motors with Hall-effect feedback. The amplifiers are designed for regulation of brushless DC motors. The MQA power supply transforms AC voltage into DC voltage. From DC voltage the amplifier produces the current for the motor. Hall sensors produce necessary information concerning rotor position. Output current is PWM controlled and due to high chopper frequency large bandwidth and dynamics are obtained.
Relations for the operation of the motor:
Torque is proportional to output current.
Speed is proportional to frequency of output current.
Direction of rotation corresponds to sense of rotation of the output current.
The MQA Series amplifier modules for DC brushless motors consist of:
One power stage card.
One logic card adaptable to any DC brushless motor that has Hall sensor devices.
One single or three phase power supply.
One shunt regulator circuit with an internal resistor.
Each MQA module has its own DC/DC converter to provide appropriate logic voltage to the module without the need for an additional input voltage. The rated input voltage is 90 or 175VAC rms between phases, which provides a DC Bus voltage of 125 or 240 VDC.
The MQA module requires an isolation transformer. A rectifier and a shunt regulator are also included in the MQA module. The braking resistor is mounted internally to the unit.
Specifications
Voltage (Input): 45 - 175 VAC
Current (Maximum): 8 - 30 Amp
Feedback (Type): Encoder
Model No.: MQA 1204, MQA 1208, MQA 1210, MQA 2404, MQA 2408, MQA 2410