Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1984-02-14
1985-06-25
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318805, 318807, H02P 540
Patent
active
045256608
ABSTRACT:
An inverter control apparatus comprises a first current level setting unit 5 which sets a protection level for switching elements included in an inverter 1, and a second current level setting unit 7 which sets a current level that prevents a stall torque/slip point from being exceeded and which is determined in association with the load characteristic of an induction motor and the voltage/frequency ratio being delivered by the inverter. The smaller of the two current levels is selected to control the frequency to lower or stop its rise to prevent the slip frequency from being exceeded. Thus, stable operation without stalling or damage to the inverter elements is achieved regardless of the voltage/frequency ratio set to drive the motor or the particular induction motor used.
REFERENCES:
patent: 3500158 (1970-03-01), Landau et al.
patent: 3593103 (1971-07-01), Chandler et al.
patent: 3671831 (1972-06-01), Chausse et al.
patent: 3983463 (1976-09-01), Nabae et al.
patent: 4139885 (1979-02-01), Overzet et al.
patent: 4315203 (1982-02-01), Ibamoto et al.
Mitsubishi Denki & Kabushiki Kaisha
Smith Jr. David
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