Primary resistor starter
• The purpose is to drop some voltage and hence reduce the voltage applied across the motor terminals.
• The initial current drawn by the motor is reduced.
• The current varies directly as the voltage.
• But the torque varies as the square of the applied voltage.
• If the voltage applied across the motor terminal is reduced by 50%, starting current is reduced by 50 % but torque is reduced to 25% of the full-voltage value.
• The figure shows such a circuit, in which either resistance or reactance coils may be used to produce a sufficient reduction in stator voltage at the instant of starting.
• This method of starting is sometimes called "primary impedance acceleration".
• Reduced voltage starting by means of series stator resistance will improve the starting power factor, but greater losses are produced.
• The advantage of reactor starting is reduced losses.
Monster Cable HDMI Cable (English/Spanish) (6 feet)
• The purpose is to drop some voltage and hence reduce the voltage applied across the motor terminals.
• The initial current drawn by the motor is reduced.
• The current varies directly as the voltage.
• But the torque varies as the square of the applied voltage.
• If the voltage applied across the motor terminal is reduced by 50%, starting current is reduced by 50 % but torque is reduced to 25% of the full-voltage value.
• The figure shows such a circuit, in which either resistance or reactance coils may be used to produce a sufficient reduction in stator voltage at the instant of starting.
• This method of starting is sometimes called "primary impedance acceleration".
• Reduced voltage starting by means of series stator resistance will improve the starting power factor, but greater losses are produced.
• The advantage of reactor starting is reduced losses.
Monster Cable HDMI Cable (English/Spanish) (6 feet)
Very informative blog you shared with us. keep sharing.
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