Lanhai motor co., LTD. Introduces the insulation test of stator coil of ac motor to you.

　　1. All the test is a minute, a minute is so-called, test shall not exceed one third of the test voltage of the voltage start, gradually or every time no more than % of cloud and block up to the test voltage value, at the same time, the test voltage value, completely by its half value to the permissible time should not be less than l0 of seconds, and then all voltage to maintain a minute later, fell to the value of l / 3 and break

　　2. The test voltage shall be ac, with a cycle rate of about 50 cycles and actual sinusoidal waveforms.

　　3. All untested parts of the test coil must be grounded when part or phase of the test coil is in operation. If thermistor coil or thermocouple is in operation, the above test must be grounded.

　　4. After the coil insulation is completed and individual coils are tested, the length of all metal leaves (occluded or aluminum foil) shall be 10 mm (3000 volts and below) longer than the length of the core or 20 mm (6000 volts). If the linear part of the coil is coated with a quine, the quine shall be the same length as the quine with a quine.

　　5. The insulation resistance of the motor must be measured before the FG-- subhigh voltage test. The insulation resistance of the motor shall not be lower than the value obtained in the following equation when AT_ is connected for temperature.