PMSM DC input above 200V
Find our reference designs and recommended products for your DC input synchronous motor control design
High performance, high voltage permanent magnet synchronous motors are dependent on smooth rotation via the full speed range of the motor, full torque control, and fast increase / slow down of the speed. The objectives of our proposed design solution for motor control drive systems are regulation, stability, robustness to the load disturbance variation and energy reduction with a specific focus on battery-powered applications. Synchronous motors with DC input are used in home appliances, industrial automation and also in battery-powered electric vehicles like forklifts.
Check our recommended products and reference designs on the following pages depending on your power class. Find the link to design resources and support tools as well as ready-to-go boards and development kits.
Both are permanent magnet-based motors with the same basic structure, consisting of permanent magnets on the rotor and windings on the stator. The drive currents in the windings must be synchronized with rotor position feedback, which can come from sensors — typically Hall effect — on the rotor, or sensorless by evaluating the motor’s back electromotive force (EMF). The difference is in the drive signals for the two motor types: A PMSM is driven sinusoidally, while a BLDC is driven trapezoidal making the PMSM much quieter, both electrically and mechanically. Plus, it has virtually no torque ripple. So a PMSM is designed to have a sinusoidal back EMF, so the rotor is shaped to a sinusoidal flux profile. A BLDC motor needs to have trapezoidal back EMF, so the rotor needs to have a uniform flux profile.
The IGBT7 is with stronger termination and optimized field design to let it pass 175°C qualification. While the operation at 175°C is only allowed during overload conditions. This definition fits for the drive application condition and lifetime requirement.
For drives application, the inverter output dv/dt is normally restricted to avoid the damage of motor wiring insulation. IGBT7 designs for this application requirement. dv/dt of IGBT7 can be well controlled by range of 5kV/µs and the switching losses is optimized at this dv/dt condition.
