Industrial Servo Motor Yaskawa AC SERVO MOTOR 900W 1000RPM SGMGH-09ACB6C

As a rule of thumb, you can generally take a fully loaded Class B insulation motor down to 50
percent speed on constant torque loads without overheating.
C You can generally take a fully loaded Class F insulation motor down to approximately 20 percent speed without overheating the motor.
C When a Class F insulation motor needs to be run below 20 percent speed on a constant torquapplication, the motor needs to be derated.
Disadvantage - Output Harmonic Distortion
The output electrical waveform generated by the ASD is not a pure sinewave and includes harmonicdistortion which is supplied to the motor.
C The harmonics are multiples of a fundamental frequency with a current component and the
current component will create heat in the motor.
C As a rule of thumb, ASD's will create between 5 to 8 percent extra heating in a motor as compared to that same motor running on a sinusoidal waveform from the power line.
C One way to overcome this problem is to use a motor with at least Class F insulation or an inverter rated motor with Class M insulation.
Disadvantage - Induced Power Line Waveform Distortion
The ASD is a solid state electronic load and will cause waveform distortion to be induced on the
input electrical power supply.
C The waveform distortion created by ASD’s consists of both harmonic distortion and line notching.
C Harmonic distortion and line notching are a result of the nonsinusoidal waveform the drive generates, which pulls the current off of the power line in non-sinusoidal pulses.
C This can severely distort the electrical power supply within the facility and if not properly protected,
can hinder the operation of other devices.
C Operations using ASD’s in the vacinity of sensitive electronic equipment should consider including either an isolation transformer, or line reactors on the input of the drive to protect the other equipment from this potential problem.