Product Description

Pacific Scientific creates a series of electronic and electrical parts. Included in their line of products are stepper motor drives such as the 5645-027. This electronic part will convert step and direction inputs to your motor winding currents. This way it can be used to control a bipolar two-phase step motor. 

The Pacific Scientific 5645-027 step motor features a bipolar chopper drive, a short circuit protection circuitry, shunt regulator circuitry and mid-range instability control. The bipolar chopper drive helps to control the motor current to a frequency of 20 kHz. The shunt regulator circuitry helps to protect the drive by removing any extra voltage if the voltage goes over 200 volts. The short circuit protection circuitry helps to keep the drive operational only if it is safe. If ever it is not safe the unit will shut off.

The Pacific Scientific 5645-027 also has what is known as optical isolation circuitry. With this feature the user signals are isolated for direction, step, enable and reset command lines. The Mid-range instability control unit helps to get rid of any loss of torque and reduces the risk of stalling of the motor. To reduce the instances of instability the oscillations can be delayed or advanced.

The step range of this unit is ½ to 1/125 and up to 25,000 revolutions. The stepper is a standard 1.8o stepper capable of full stepping or micro-stepping. The unit also features idle current reduction which helps to provide a reduction in the motor winding current by 50%. The ICR will kick in one second after the final input step pulse. The unit also features a current setting which is used to set the current that is supplied to the motor by the 5645-027.