Category: High Voltage Electric Motor
High Voltage Electric Motor
High voltage motors refer to motors with a rated voltage of 1000V or higher. Commonly used voltages are 6000V and 10000V, but due to differences in domestic and international power grids, voltage levels of 3300V, 6600V, and 11000V are also available.
High voltage electric motors were developed because motor power is directly proportional to the product of voltage and current. Therefore, when the power of a low-voltage motor increases to a certain level (e.g., 800kW, 380V), the current is limited by the conductor’s allowable carrying capacity, making it difficult to increase further or resulting in excessive cost. Increasing the voltage is necessary to achieve higher power output. The advantages of high-voltage motors are high power and strong impact resistance; the disadvantages are high inertia, making starting and braking difficult.
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High Voltage Motor Series
Application of High Voltage Electric Motor
Fan
Pump
Compressor
Conveyor
Ball Mill
General Purpose Equipment
High Voltage Electric Motor Selection Considerations
一. Power and Rotational Speed Selection
1. Allow for a margin in rated power
Select the model based on the load shaft power, not exactly equal to the calculated power. For continuously operating equipment, allow for a 10%–15% margin; for impact loads (crushers, ball mills), allow for a 20%–30% margin; avoid prolonged full-load operation leading to overheating.
Note: High voltage electric motors should not have excessive margins, as this will reduce motor efficiency and power factor, resulting in energy waste.
2. Rated Speed Matching Process
Prioritize matching the required speed of the equipment to reduce the need for reduction gears; Distinguishing between squirrel cage induction motors and slip ring induction motors:
1. Ordinary fans and water pumps: Use high voltage squirrel cage induction motors, which have a simple structure and require less maintenance;
2. Crusheres and ball mills: Use high voltage slip ring induction motors, which can meet the high starting torque requirements.
3. Startup Condition Verification
- Confirm grid capacity; voltage drop during high voltage electric motor startup must not exceed the allowable value specified in the standard.
- For heavy-load starting equipment, verify the motor’s locked rotor torque and maximum torque to ensure they meet load startup requirements.
- Determine the starting method: direct start, reactor start, soft start, or frequency converter start.
二、Voltage Level Selection
- Power 200-800kW: 6kV is commonly used;
- Power >800-1000kW: 10kV is preferred to reduce motor current and cable loss;
The voltage must be consistent with the output voltage of the on-site high voltage switchgear; A 10kV motor cannot be used in a 6kV system.
Check: Rated voltage, allowable voltage fluctuation range; generally, it can operate continuously under ±5% of the rated voltage.
三、Protection Grade
Indoor clean electrical distribution room/pump room: IP23, IP44; Dust, moisture, outdoor: IP54, IP55; Explosion proof area: High voltage explosion proof motor (Ex) of the corresponding explosion proof rating must be selected.
Frequently Asked Questions
What types of high voltage electric motors does Langrui have?
Classified by structure: Squirrel cage induction motor, slip ring induction motor;
Classified by operating conditions: General purpose motor, inverter duty motor, explosion proof motor;
Why choose Langrui brand 3 phase induction motors?
Shandong Langrui has been deeply involved in the research and development and manufacturing of 3 phase induction motors for over 30 years, accumulating profound technical expertise and becoming a professional, high-quality brand of industrial motors.
All products strictly adhere to national standards and IEC international standards.
Can you customize non-standard high voltage electric motors?
Yes, We can design and customize motors according to your needs. We are more than willing to do so because it is our strength.
