Starting protection for synchronous machines
Rosenberry Hub
Rosenberry Hub
The starting of synchronous motors gives rise to stresses which can cause serious damage. Fixed speed synchronous motors that are required to start asynchronously require extra switching devices on the rotor to allow the induced field currents to flow safely without damaging any of the components.
With this in mind, our experts have designed the Rosenberry Starter Hub which can be supplied and fitted on new plant, but can just as easily be retrofitted to existing machines where components have become obsolete or where the existing design is troublesome.
| ATEX Certificate No. | CML 15ATEX4041U |
| IECEx Certificate No. | IECEx CML 15.0021U |
| ATEX Marking | Ex II 3 G |
| Code | Ex ec IIC Gc |
| Rating | 600A DC, 750V DC (1500V PIV) |
| Speed | Max: 1800rpm + 20% overspeed |
Using conservatively rated devices able to withstand high dv/dt
Few connections, minimal wiring & only 3 bolted electrical connections
High current rated device (600 A DC)
High voltage withstand (750 V DC 1500 V PIV)
Range of resistances
Suitable for rotational speeds of up to 1800 rpm
Uses standard silicon devices readily available from major suppliers
Fail-safe circuits, devices and field protected during fault conditions
All components specifically selected for rotating duties
Operational experience of more than 10,000 starts and 1,000,000 running hours
Easily accessed and maintainable components
Diagnostic LED’s fitted as standard
Design includes starting resistor which improves starting torque through the 75-100% speed range
Reduces oscillating torques
Switched out of circuit once motor is synchronised to minimise losses
A Rotoguard can be fitted allowing earth faults to be detected and the display of rotor voltage and leakage resistance
With the addition of a shunt, rotor current and the mean winding temperature can also displayed
| Rating | 600A DC, 750V DC (1500V PIV) - Nominal |
| Speed | Max: 1500rpm + 20% overspeed |
| Weight | 250kg |
| Length | 400mm - can be fitted on machines with a rotor diameter no larger than 425mm |
Using conservatively rated devices able to withstand high dv/dt
Few connections, minimal wiring & only 3 bolted electrical connections
High current rated device (600 A DC)
High voltage withstand (750 V DC 1500 V PIV)
Range of resistance
Suitable for rotational speeds of up to1500 rpm
Uses standard silicon devices readily available from major suppliers
Fail-safe circuits, devices and field protected during fault conditions
All components specifically selected for rotating duties
More than 1,000,000 running hours
Easily accessed and maintainable components
Diagnostic LED’s fitted as standard
Design includes starting resistor which improves starting torque through the 75-100% speed range
Reduces oscillating torques
Switched out of circuit once motor is synchronised to minimise losses
A Rotoguard can be fitted allowing earth faults to be detected and the display of rotor voltage and leakage resistance
With the addition of a shunt, rotor current and the mean winding temperature are also displayed
Applications
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Quartzelec Ltd, Castle Mound Way, Central Park, Rugby, Warwickshire, CV23 0WB
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