Designing ability
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- Designing ability
R & D team
- The R&D Center consists of four departments: R&D Management Group, Hangzhou R&D Department, Changchun Research Institute, and Test Center
- More than 70 R&D engineers, including 5 doctors and 10 masters
- R&D management group: system construction, document management, standardization, project management
- Hangzhou R&D Department: Provide competitive solutions in technology, quality, cost, etc.
- Changchun Research Institute: cutting-edge technology research and development verification, general platform construction
- Test center: material test, product function verification, reliability verification
patent
A power device die
temperature estimation Calculation
method and equipment
temperature estimation Calculation
method and equipment
Sensorless motor
control system system
and control method
control system system
and control method
11 Invention
Patents
14 Utility
Model Patents
Nonlinear variable carrier
frequency system, method
and storage medium based
on PFC harmonic suppression
frequency system, method
and storage medium based
on PFC harmonic suppression
A torque compensation
system and method for
compressor
system and method for
compressor
How to start a
position sensorless motor
position sensorless motor
7 Software
Copyrights
A self-adaptive
zero-crossing detection
method for brushless
DC motor
zero-crossing detection
method for brushless
DC motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
A Soft Measurement Method for Rotor Speed and Displacement of Bearingless Permanent Magnet Synchronous Motor
performance test equipment
150KW electric dynamometer
50KW eddy current dynamometer
2KW hysteresis dynamometer
Grid Simulator
15KW electronic load
Air volume tester
Water pump test system
Power Analyzer
Electromagnetic Compatibility Test Equipment
Conduction test shielded room
Disturbance power test system
Disturbance voltage test system
Dynamometer
Cyclic voltage drop tester
Electrostatic discharge tester
Lightning surge tester
Group pulse tester
Reliability Test Equipment
High and low temperature damp heat test chamber
High and low temperature impact test chamber
Vibration Tester
Salt spray test chamber
Insulation withstand voltage tester
Voltage residual
High temperature aging room
Button life machine
0
Patent
0
Utility model patents
0
Software copyright
01
Method and device for estimating die temperature of a power device
02
Position sensorless motor control system and control method
03
How to start a position sensorless motor
04
Nonlinear variable carrier frequency system, method and storage medium based on PFC harmonic suppression
05
A kind of torque compensation for compressor system, method
06
A self-adaptive zero-crossing detection method for brushless DC motor
- Real-time modification of parameters takes effect and is saved
- Read motor running status in real time
- Bootloader upgrade procedure
- Driver board error message reading
- Suitable for application engineer debugging
- Monitor program arbitrary node variables
- Support monitoring of each FOC variable
- Automatic matching of variables to be monitored
- Suitable for algorithm engineer debugging
- Mobile APP
- Bluetooth connection
- Can realize parameter modification, monitoring and recording
- Enables driver OTA
- Suitable for after-sales, customer maintenance product use
characteristic
Zero-speed high-torque start
Starting current waveform
- The start-up scheme is suitable for various working conditions of ice pressure, air pressure and fan
- Single power cycle enters closed loop
Fan closed-loop starts up against the wind
Start against the wind
Tailwind start
- Start speed, position recognition
- Adapt to high wind speed and large inertia
- Suitable for electrolytic solutions
AC voltage beat frequency suppression
before inhibition
After inhibition
- Reduce system low frequency jitter
- Reduce motor shaft current due to control imbalance
voltage drop suppression
voltage drop suppression
- smooth transition
Low Noise Single Resistor Solution
Single Resistor Noise Spectrum
Three Resistor Noise Spectrum
The above UVW modulation method is a traditional single-resistor scheme, which will inevitably introduce electromagnetic noise. Using Zhouju’s self-developed single-resistor solution can minimize electromagnetic noise and obtain almost the same noise effect as the three-resistor.
Modulation ratio 1.1
Modulation ratio 1.1
- Adaptive compensation for harmonics caused by inverter dead zone and motor cogging
- No need to calibrate power devices
Adaptive Compensation for Torque Fluctuation of Single Rotor Compressor
Before torque compensation is turned on
After torque compensation is turned on
- Reduce torque ripple and reduce system vibration
- Parameter self-adaptation, no need to mark the initial electrical angle
Dead zone harmonic compensation
Comparison before and after compensation
- Adaptive compensation for harmonics caused by inverter dead zone and motor cogging
- No need to calibrate power devices
Carrier frequency optimization strategy
Optimize the front amplitude frequency characteristics
Optimized amplitude-frequency characteristics
- Carrier frequency jitter
- Variable carrier frequency
- Various modulation methods
Perfect PFC solution
current voltage waveform
- Single Phase Interleaved PFC
- Three-phase full-bridge PFC
