Nanotec (Germany) has expanded its PD4-N-IP plug-and-drive motor line with the PD4-N5918M integrated stepper motor with CANopen connectivity. The IP65-rated motor has a length of 80,6 mm and features torque of up to 1,13 Nm and speeds of up to 2400 rpm. Operating voltage ranges from 12 V to 48 V.
INCLUDING THE INTRODUCED DRIVE, all Nema 23 stepper motors by Nanotec are available in three design lengths. The motors base on the company’s dspDrive technology and provide sinus commutation as well as an integrated position control system with an encoder. While conventional ICs measure the winding current and the target current value with only 6 or 8 bit, the digital signal processor carries out the entire control loop with a resolution of 12 bits. The IP65-rated models of the series are equipped with M12 connectors and are suited for use in rough application environments. They are protected from spraying water, and resist the effects of dust (IP65). The devices may withstand temperatures from -10 °C to +40 °C. These models are compatible with plug-and-drive motors in other sizes. This allows the developer to implement uniform communication and control technology in mixed environments. The motor may also be operated in closed-loop mode.
It is available with CANopen or EIA-485 interface. The motors integrate a positioning controller and an encoder. Compared to a solution with an external controller, a large part of the cabling expense has been eliminated – just the power supply and the CAN interface need to be wired. Additional sensors and actuators can be connected to the motor inputs and outputs. Nanotec offers the free-of-charge Nanopro and NanoCAN (for CANopen environments) programming software. With the Windows-based Nanopro software, customers are able to create and test complex axial movements without prior programming knowledge via the EIA 485 interface. Together with movement sequences, machine parameters – such as spindle pitch, gear reduction and motor parameters, i.e. micro-step mode, – can be adjusted via the software. The NanoCAN software is the commissioning software for CANopen communication. Through the support of interpolated mode according to the CiA 402 profile specification, it is possible to drive the motors for CNC applications. The parameters of the PI current controller can be adjusted to the motor and its target speed. This allows a smooth, low-resonance operation with a sinusoidal current in the windings. In the closed-loop mode, the stepper motors behave like servomotors because of the field-oriented control. In contrast to the position re-adjustment, which was typical of stepper motors up to now, here the stator magnetic field is controlled via the rotary encoder, just like a servomotor. The conventional stepper motor noise and resonances disappear – up to its maximum torque, the motor can no longer lose steps. Particularly with speeds up 1500 rpm or, respectively, torques of up to 10 Nm, the sinusoidal commutated stepper motor is an alternative to conventional servo systems. Even a direct drive without gearing is possible.
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