Flywheel energy storage is a physical energy storage method that utilizes the kinetic energy of a rotating body to store and release electrical energy, with the conversion between kinetic energy and electrical energy accomplished by a motor/generator coaxial with the flywheel body. When the motor operates in motor mode, it accelerates the flywheel rotor, converting input electrical energy into kinetic energy for storage; when the motor operates in generator mode, it decelerates the flywheel rotor, converting kinetic energy into electrical energy for output. The acceleration and deceleration of the motor are controlled by the control unit.
Ek = mv² = Jω²
Product Advantages
High energy storage density, high instantaneous power
It can output greater energy in a short time, facilitating rapid response of the equipment.
Long life cycle
It can be charged and discharged frequently with no performance degradation, and the system has a very long cycle life with a design life of 30 years.
Environmentally friendly
No chemical substance release, no safety hazards such as chemical explosions.
High energy conversion efficiency
The conversion efficiency between electromagnetic and kinetic energy exceeds 88%, and the overall efficiency of the energy storage system exceeds 86%.
High reliability, maintenance-free
Stable operation, with no mechanical wear after adopting electromagnetic bearings, essentially achieving maintenance-free operation.
Application Scope
Microgrids
Rail transit
New energy power stations
Sensitive loads
Providing auxiliary services for power systems such as voltage and frequency regulation, transient support, and emergency backup power.
Product Parameters
| 1MW/40MJ Flywheel System | 1MW/15MJ Flywheel System | 300KW/100MJ Flywheel System | |
| Energy storage capacity | 15MJ(4.2kWh) | 40MJ(11.1kWh) | 100MJ(27.8kWh) |
| Peak charge/discharge power | 1.0MW | 1.0MW | 300kW |
| Maximum speed | 20000rpm | 13000rpm | 15000rpm |
| Linear speed | 523.3m/s | 400 m/s | 750 m/s |
| Rated voltage | 1500DC | 1500DC | 1000DC |
| Application scenario | Rail transit | Rail transit | Wind power/grid frequency regulation/UPS |
| Motor | Permanent magnet synchronous | Permanent magnet synchronous | Permanent magnet synchronous |
| Flywheel energy storage density (Wh/kg) | 9.5 | 9.3 | 19.8 |
| Charge/discharge cycle | 27s | 30s | 336s |
| Response time | ＜100ms | ＜100ms | ＜100ms |
| Depth of discharge | 75%(3.1kWh) | 75%(8.3kWh) | 75%(20.8kWh) |
| Energy conversion efficiency (%) | ＞88% | ＞88% | ＞88% |
| Product self-loss | ＜3% | ＜3% | ＜3% |
| Noise | Noise at full load ＜80db | Noise at full load ＜80db | Noise at full load ＜80db |
| Bearing type | Permanent magnet biased hybrid magnetic bearing | Permanent magnet biased hybrid magnetic bearing | Permanent magnet biased hybrid magnetic bearing |
| Operating temperature | -40℃~45℃(derated operation above 45℃) | -40℃~45℃(derated operation above 45℃) | -40℃~45℃(derated operation above 45℃) |
| Applicable ambient humidity | ＜95% | ＜95% | ＜95% |
| Cooling method | Water cooling | Water cooling | Water cooling |
| System weight | 3700kg | 4550kg | 6500kg |
| Overall system dimensions (W*D*H)mm | 3410*1000*2200 | 3500*1200*2200 | 3410*1500*2200 |
| Cycle count | 10 million cycles | 10 million cycles | 10 million cycles |
