What we make
Simply, an electric motor converts electrical energy into mechanical energy. A synchronous motor, has two main components, a rotor and a stator. A rotor is usually the rotating part and the stator is the stationary part, hence their names. Permanent magnets are mounted on the surface of the rotor, and through the stator are conducting coils, which when a current is passed through them, create a magnetic field. Through the interaction of the two, the rotor then rotates at a synchronous speed to the rotating of the magnetic field. This is aligned by feedback device fitted to the end of the motor. The spindle motors on the other hand are asynchronous, and do not have permanent magnets on the surface of the rotor. According to Faraday’s law, the rotating magnetic field in the stator induces an electric current inside the rotor. This induced current produces its own magnetic field, and the interaction of these two fields causes the rotor to rotate. The choice between using a synchronous or asynchronous motor is dependent on the application.
We manufacture high performance AC synchronous servomotors and asynchronous spindle motors. Included in the synchronous type are high inertia motors (HJ). HJ series of AC servomotors have high inertia rotors along with larger than standard shafts and bearings to provide ultra smooth operation with minimal vibration and resonance when coupled to high inertial loads. Ideally suited for machine tool axis or for applications where the reflected inertia is high. HJ motors are available in 5 frame sizes with a stall torque range of 3 to 67 Nm.
Our aysnchronous spindle motors have through lamination forced ventilation for high output power and compact size. Precision squirrel cage construction and finite balancing provides smooth operation and silent running for high end machine tool spindle applications. Spindle motors are asynchronous induction motors, different from our synchronous servo motors. These motors utilise injection cast rotor cores rather than permanent magnet rotors, as used for servo motors. Current is induced by the winding into the rotor bars to produce torque. Spindle motors are utilised in the machine tool industry to drive cutting tools. These motors can be mounted horizontally or vertically in the application. Spindle motors currently produced run at speeds up to 15,000 rpm.
Future developments are in progress to produce spindle motors operating within a higher speed range. To achieve the low vibration high accuracy characteristics required by the customer, the component manufacture requires high accuracy i.e. extremely low tolerances need to be achieved in our machine shop. The machines need to be balanced to a very high level. The results of all inputs are monitored during test and the pass level for our motors exceeds that defined within the ISO 1940 standard for motor vibration. This allows for the machine to be used where a high quality surface finish is required by the customer