起动前的检查方法：

1、新的或长期停用的电机，使用前应检查绕组间和绕组对地绝缘电阻。通常对500V以下的电机用500V绝缘电阻表；对500-1000V的电机用1000V绝缘电阻表；对1000V以上的电机用2500V绝缘电阻表。绝缘电阻每千伏工作电压不得小于1MΩ，并应在电机冷却状态下测量。

2、检查电机的外表有无裂纹，各紧固螺钉及零件是否齐全，电机的固定情况是否良好。

3、检查电机传动机构的工作是否可靠。

4、根据铭牌所示数据，如电压、功率、频率、联结、转速等与电源、负载比较是否相符。

5、检查电机的通风情况及轴承润滑情况是否正常。

6、扳动电机转轴，检查转子能否自由转动，转动时有无杂声。

7、检查电机的电刷装配情况及举刷机构是否灵活，举刷手柄的位置是否正确。

8、检查电机接地装置是否可靠。

Inspection method before starting:

1. For new or long-term discontinued motors, the insulation resistance between windings and winding to ground should be checked before use. Usually, 500V insulation resistance meters are used for motors below 500V; Use a 1000V insulation resistance meter for 500-1000V motors; Use a 2500V insulation resistance meter for motors above 1000V. The insulation resistance should not be less than 1M Ω per kilovolt working voltage and should be measured when the motor is cooled.

2. Check the appearance of the motor for cracks, ensure that all fastening screws and parts are complete, and ensure that the motor is properly secured.

3. Check whether the operation of the motor transmission mechanism is reliable.

4. According to the data shown on the nameplate, whether the voltage, power, frequency, connection, speed, etc. match the power supply and load comparison.

5. Check whether the motor ventilation and bearing lubrication are normal.

6. Pull the motor shaft to check if the rotor can rotate freely and if there is any noise during rotation.

7. Check the assembly of the motor's brush and whether the brush lifting mechanism is flexible, and whether the position of the brush lifting handle is correct.

8. Check if the motor grounding device is reliable.