Drive BLHIBLHX Series Brushless Servo System BLH/BLHX Series motor/drive packages offer a low cost solution in a wide range of brushless servo applications. package includes a pre-cabled motor and drive with inte power supply for direct operation from an isolating transformer. The present range includes a choice of four motors, analog command servos and digital positioning servos. With peak torques between 56 oz-in (0.4 Nm) and 1840 oz-in (1 3 Nm) and speeds of up to 1 1,000 rpm these packages Isolating AC power is the generally accepted practice when offer incredibly high performance in a small package size. responding to emergency stop conditions, this removes power from the motor and renders the system safe. An All motors are two-phase brushless designs using rare earth auxiliary 24VDC input is provided to maintain the internal logic magnets. Commutation is derived from an absolute encoder supplies while the AC power has been removed. This provides while position feedback is derived from an incremental the benefit of maintaining power to the motor encoder so that encoder. Both encoders are robust metal disk encoders the controller knows where the motor is, making system mounted directly to the motor shaft. The commutation recovery easier, and the additional benefit that communication encoder provides 16 states per electrical cycle and superior can be maintained with the controller to determine status. The torque ripple to trapezoidal DC brushless systems and does auxiliary 24VDC input is available if this capability is required, not incur the cost penalty of conventional sine wave drives. but is not necessary for general operation. The incremental encoder has a resolution of 500 lines/rev or 1,000 lines/rev depending on motor size. A tachometer is not BLH Series drives accept an analog command signal for required because velocity feedback can be derived from the torque or velocity control applications or for use with a multi- incremental encoder. axis servo controller. The BLHX Series drives combine a BLH drive with a positioning card in one package for single-axis The drive circuit is based on a proven recirculating PWM positioning applications. design. Recirculating technology reduces chopping losses in the drive and motor hence increasing system efficiency. BLH and BLHX Common Features Surface mount components and power plate technology Two versions increase reliability through better thermal management and consistent manufacture. The built-in power supply operates BLH - Analog command servo from a single AC input voltage and employs a switching BLHX - Digital positioning servo regulator to generate integral power supplies. Protection Supplied as complete, ready wired motor/drive packages circuits guard against short circuit of the motor phases, Drive operates in torque or velocity amplifier modes overheating of the drive and supply faults. An integral braking resistor dissipates regenerated energy. Simplified drive set-up and adjustment LED diagnostics Drive outputs for motor are short-circuit protected Direct operation from isolating transformer Maintenance free brushless motors Torques up to 1,840 oz-in (1 3 Nm) Speeds up to 11,000 rpm Motor has built-in incremental encoder for position For complete specifications by feed back return fax, please call us at this Please contact Compumotor's factory for more information on BLH and BLHX. number and request Document 1020. Parker Hannifin Corporation Compumotor Division Rohnert Park, California Automation